Hydrological Processes最新文献

{"title":"Quantitative Assessment of Environmental Site Design vs. Traditional Storage-Based Stormwater Management: Impacts on Catchment Hydrology of Minebank Run, Baltimore, MD","authors":"M. Maliha,&nbsp;M. Alsmadi,&nbsp;D. Sample,&nbsp;T. Wynn-Thompson,&nbsp;A. Miller","doi":"10.1002/hyp.70268","DOIUrl":"https://doi.org/10.1002/hyp.70268","url":null,"abstract":"<p>Environmental site design (ESD) is a stormwater management approach that prioritises the use of infiltration-based non-structural techniques to mimic the natural hydrologic cycle by reducing impervious surfaces, slowing runoff and increasing infiltration. Traditional storage-based stormwater management is designed for flood control by quickly diverting runoff from developed areas. This study compared the effect of ESD and only storage-based stormwater management practices on the hydrology of an urban watershed in Baltimore County, Maryland, USA. Minebank Run is an 8.47 km² flashy urban stream with a catchment largely developed without stormwater management. A calibrated SWMM model was used to simulate changes in catchment hydrology resulting from ESD and detention basins over a 54-year period, from the onset of urbanisation in 1948 to the state of urbanisation in 2001. This approach offers a novel, retrospective perspective by simulating how the watershed hydrology might have changed if ESD had been implemented from the beginning of urban development. The model results were analysed by quantifying and comparing different hydrologic metrics to evaluate runoff quantity and flow variability. Results indicated that although storage ponds performed similarly to ESD in reducing annual maximum peak flows (43% vs. 45% reduction, respectively), ESD reduced mean annual runoff coefficients significantly more than ponds (28% vs. 2.7%, <i>p</i> &lt; 0.0001). The Richards–Baker Flashiness Index was reduced from 0.46 to 0.32 with the implementation of ESD, as compared to 0.36 with detention ponds. This study also tested the hypothesis that the impact of urbanisation on the hydrology of the Minebank Run watershed would have been reduced if it had been developed with ESD. The results indicated that the implementation of ESD would have reduced annual maximum peak flows by an average of 46%, annual mean runoff coefficients by 51% and the Richards–Baker Flashiness Index by 37%, as compared to the as-is condition. The study provides quantitative insights into the performance of traditional and innovative stormwater management techniques at the catchment scale, illustrating the benefits of a combination of both infiltration practices and detention storage in reducing the hydrologic impacts of urbanisation.</p>","PeriodicalId":13189,"journal":{"name":"Hydrological Processes","volume":"39 10","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/hyp.70268","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145228220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Using 222Rn to Determine Groundwater Velocities in a Braidplain Aquifer","authors":"Christy W. Songola,&nbsp;Leanne K. Morgan,&nbsp;Eddie W. Banks,&nbsp;Crile Doscher,&nbsp;Ian Cartwright","doi":"10.1002/hyp.70282","DOIUrl":"https://doi.org/10.1002/hyp.70282","url":null,"abstract":"<p>Surface water–groundwater exchange processes are uncertain in braided river settings where aquifer geomorphology and hydraulic gradients are highly heterogeneous. This study determines groundwater velocities in a braidplain aquifer in Te Waipounamu, South Island of New Zealand, where the Waikirikiri Selwyn River is losing to groundwater. ²²²Rn activities and hydraulic heads were measured both in the river and in a dense network of 22 piezometers installed at the study site. ²²²Rn activities were used to calculate groundwater residence times which, together with flow paths determined from hydraulic head contour maps, were used to calculate mean groundwater velocities. ²²²Rn residence time calculations based on a one-dimensional piston flow groundwater model yield a median groundwater velocity of 46 m day⁻¹ at high river flow and 38 m day⁻¹ at low river flow. However, an alternate (exponential) model demonstrates that residence times would be longer than those estimated using the piston flow model. At ²²²Rn activities above 6 Bq L⁻¹, the exponential model yields residence times twice those obtained from the piston flow model, and groundwater velocities that are less than half those obtained with the piston flow model. This highlights the importance of characterising groundwater flow paths in braidplain aquifers to improve estimates of groundwater velocities and recharge from losing braided rivers.</p>","PeriodicalId":13189,"journal":{"name":"Hydrological Processes","volume":"39 10","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/hyp.70282","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145228097","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The Role of Beaver Dams in Modulating Hydrological Connectivity and Nutrient Dynamics in Agricultural Catchments With Intermittent Streams","authors":"Famin Wang,&nbsp;Doerthe Tetzlaff,&nbsp;Ji Liu,&nbsp;Tobias Goldhammer,&nbsp;Jonas Freymueller,&nbsp;Hauke Daempfling,&nbsp;Chris Soulsby","doi":"10.1002/hyp.70280","DOIUrl":"https://doi.org/10.1002/hyp.70280","url":null,"abstract":"<p>Beaver dams and associated wetlands can significantly alter hydrological connectivity and biogeochemical processes in catchments, but their combined influence on nutrient dynamics remains understudied. This research investigated the combined effects of beaver-impacted ditches and ponds on macronutrient (nitrogen (N), phosphorus (P), and carbon (C)) dynamics in an intermittent agricultural stream network. Building on long-term catchment monitoring, this study provides the first spatially extensive, site-scale assessment of nutrient dynamics across multiple water body types in this catchment, using comparisons between beaver dam impacted and non-impacted sites across multiple water body types to infer beaver-related effects under variable hydrological connectivity. Continuous monitoring of water presence and water levels across the stream network revealed distinct seasonal patterns of hydrological connectivity, which strongly influenced stream water quality. When hydrological connectivity was highest in the wet season, agricultural drainage elevated nitrate nitrogen (NO₃-N) concentrations, creating extreme stoichiometric imbalances. In contrast, during dry periods, as hydrological connectivity declined and the stream network became intermittent, beaver ditch-pond complexes demonstrated significant capacity for nutrient mitigation through enhanced N removal, coupled with increased concentrations of soluble reactive phosphorus (SRP) and dissolved organic carbon (DOC). Beaver activity also contributed to maintaining hydrological connectivity and sustaining stream flows, prolonging the time for nutrient processing. Beaver-related ponds and wetlands significantly reduced NO₃-N while elevating total P and DOC concentrations, resulting in a more balanced nutrient stoichiometry closely linked to hydrological connectivity. These findings demonstrate the potential effectiveness of beaver dams and associated wetlands as nature-based solutions for agricultural nutrient management, though their benefits were most evident in spring and autumn when water fluxes are low and channel connectivity, supported by groundwater inputs, linked catchment nutrient inputs to the river. In addition, the impacts remain relatively localised, with downstream inputs from agricultural runoff rapidly offsetting benefits for catchment-scale water quality.</p>","PeriodicalId":13189,"journal":{"name":"Hydrological Processes","volume":"39 10","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/hyp.70280","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145228100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessing Flood Water Infiltration and Storage in a Restored Floodplain","authors":"Nicholas Corson-Dosch,&nbsp;Faith Fitzpatrick,&nbsp;Paul Juckem,&nbsp;Jim Blount,&nbsp;Wonsook Ha","doi":"10.1002/hyp.70281","DOIUrl":"https://doi.org/10.1002/hyp.70281","url":null,"abstract":"<p>In urban areas, floodplain restoration is gaining prominence as a strategy for restoring the natural functions of floodplain ecosystems and reducing flood risk. This has spurred research into potential interactions between floodwaters, the hyporheic zone, and the floodplain aquifer. An urban restored stream in Wisconsin, USA, was used as a case study to examine four methods to estimate floodplain infiltration and storage during overbank floods. We characterised flood-related infiltration over a 4-year period from 2018 through 2021 by simultaneously and continuously measuring groundwater levels and vertical temperature profiles with stream water levels linked to high-resolution flood inundation maps. High-resolution topographic data helped to quantify surface floodplain storage and the unsaturated soil volume relative to flood stage. Infiltration estimates from the simple methods align well with those from the more complex methods; however, the complex methods provide additional insights about the factors influencing infiltration. Results from all methods indicate that the volume of water that vertically infiltrates during floods is likely small relative to the total volume of the flood, with 0.08%–0.52% of flood water infiltrating into the floodplain, on average. Spatially variable vertical hydraulic gradients, driven by flood depth, groundwater level, and permeability, imply heterogeneous patterns of infiltration across the floodplain. Gradients favourable for infiltration typically occurred during the onset of flooding but, over the study period, were mostly (98% of the time) favourable for groundwater discharge to the channel (non-flood periods). These findings highlight the importance of considering surface-groundwater dynamics, floodplain soils, and unsaturated floodplain volume in defining the benefits of floodplain infiltration for flood attenuation.</p>","PeriodicalId":13189,"journal":{"name":"Hydrological Processes","volume":"39 10","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/hyp.70281","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145228095","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Learning From Multiyear Meteorological Drought Impacts on Stream Water Quality—Implications for Water Quality Changes Under a Changing Climate","authors":"Anna Lintern,&nbsp;Robert Sargent,&nbsp;Serene Tan,&nbsp;Danlu Guo,&nbsp;Andrew W. Western,&nbsp;Xixi Shi,&nbsp;Cami Plum","doi":"10.1002/hyp.70264","DOIUrl":"https://doi.org/10.1002/hyp.70264","url":null,"abstract":"<p>The frequency and intensity of multiyear drought are expected to increase in the future with climate change. This study aims to investigate the impact of multiyear meteorological drought on the behaviour of five water quality constituents (dissolved oxygen, total nitrogen, total phosphorus, electrical conductivity, and turbidity) at 134 sites across Victoria, Australia. A 27-year period (1995–2021) of observed water quality data that spans the Millennium Drought (~1997–2009) was subdivided into meteorological multiyear drought and non-drought conditions. Statistical analysis of these observed data indicates that under multiyear drought, EC increases, while turbidity, TN, TP, and DO decrease in concentration. The magnitude of change in constituent concentrations may be driven by climate characteristics and drought intensity, as inferred from the spatial variability in change in water quality. For salts, TN, and TP, we also identified that constituent loads decrease during multiyear drought periods, regardless of the direction of change of constituent concentrations during drought, highlighting the dominant role of streamflow in driving the trends in constituent loads. Analysis of concentration-streamflow relationships during drought and non-drought periods suggests that parameter values within the concentration-discharge relationship (intercept and slope) shift during multiyear drought, especially in warmer and drier catchments. This indicates that water quality during multiyear drought cannot necessarily be predicted using concentration-discharge relationships calibrated using water quality data from non-drought periods. This investigation can help inform approaches to managing water quality in the future under a changing climate, given persistently drier conditions are expected in this region.</p>","PeriodicalId":13189,"journal":{"name":"Hydrological Processes","volume":"39 10","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/hyp.70264","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145228219","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Assessing the Impact of Water Diversion on Hydrodynamics and Water Quality in the Upper Taihu Basin, China","authors":"Suli Peng,&nbsp;Pan Wu,&nbsp;Zhili Wang,&nbsp;Kebing Chen,&nbsp;Zhi Dong,&nbsp;Yongjun Lu,&nbsp;Li Chen,&nbsp;Yan Lu","doi":"10.1002/hyp.70289","DOIUrl":"https://doi.org/10.1002/hyp.70289","url":null,"abstract":"&lt;div&gt;\u0000 \u0000 &lt;p&gt;Owing to the substantial spatiotemporal variability and intricacy in the hydrodynamic and water quality responses to water diversion, the determination of impact on the aquatic environment has been predominantly qualitative. The quantitative assessment of the impact of anthropogenic activities (water diversion) on the aquatic environment has the potential to enhance the accuracy of a comprehensive benefit evaluation. The present study utilised hydrological data, encompassing flow rate (Q) and water quality index (WQI) in the lakes Taohu and Gehu basin (TGHs), from two typical water resource allocations in the Taihu basin. The study revealed how hydrodynamics and water quality in response to water diversion. Furthermore, it introduced the concept of “water diversion impact value” to quantify the impacts of water diversion on the aquatic environment. The results indicated when the overall water diversion effect showed enhancement in water quality, the WQI impact value was positive alongside a negative Q impact value (&lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msup&gt;\u0000 &lt;mi&gt;E&lt;/mi&gt;\u0000 &lt;mi&gt;WQI&lt;/mi&gt;\u0000 &lt;/msup&gt;\u0000 &lt;mo&gt;=&lt;/mo&gt;\u0000 &lt;mn&gt;1.417&lt;/mn&gt;\u0000 &lt;mo&gt;,&lt;/mo&gt;\u0000 &lt;msup&gt;\u0000 &lt;mi&gt;E&lt;/mi&gt;\u0000 &lt;mi&gt;Q&lt;/mi&gt;\u0000 &lt;/msup&gt;\u0000 &lt;mo&gt;=&lt;/mo&gt;\u0000 &lt;mo&gt;−&lt;/mo&gt;\u0000 &lt;mn&gt;14.2&lt;/mn&gt;\u0000 &lt;mspace&gt;&lt;/mspace&gt;\u0000 &lt;msup&gt;\u0000 &lt;mi&gt;m&lt;/mi&gt;\u0000 &lt;mn&gt;3&lt;/mn&gt;\u0000 &lt;/msup&gt;\u0000 &lt;mo&gt;/&lt;/mo&gt;\u0000 &lt;mi&gt;s&lt;/mi&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$$ {E}^{WQI}=1.417,{E}^Q=-14.2 {mathrm{m}}^3/mathrm{s} $$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;); Conversely, when water diversion improved hydrodynamic conditions, the WQI impact value was negative accompanied by a larger positive Q impact value (&lt;span&gt;&lt;/span&gt;&lt;math&gt;\u0000 &lt;semantics&gt;\u0000 &lt;mrow&gt;\u0000 &lt;msup&gt;\u0000 &lt;mi&gt;E&lt;/mi&gt;\u0000 &lt;mi&gt;WQI&lt;/mi&gt;\u0000 &lt;/msup&gt;\u0000 &lt;mo&gt;=&lt;/mo&gt;\u0000 &lt;mo&gt;−&lt;/mo&gt;\u0000 &lt;mn&gt;3.17&lt;/mn&gt;\u0000 &lt;mo&gt;,&lt;/mo&gt;\u0000 &lt;msup&gt;\u0000 &lt;mi&gt;E&lt;/mi&gt;\u0000 &lt;mi&gt;Q&lt;/mi&gt;\u0000 &lt;/msup&gt;\u0000 &lt;mo&gt;=&lt;/mo&gt;\u0000 &lt;mn&gt;7.215&lt;/mn&gt;\u0000 &lt;mspace&gt;&lt;/mspace&gt;\u0000 &lt;msup&gt;\u0000 &lt;mi&gt;m&lt;/mi&gt;\u0000 &lt;mn&gt;3&lt;/mn&gt;\u0000 &lt;/msup&gt;\u0000 &lt;mo&gt;/&lt;/mo&gt;\u0000 &lt;mi&gt;s&lt;/mi&gt;\u0000 &lt;/mrow&gt;\u0000 &lt;annotation&gt;$$ {E}^{WQI}=-3.17,{E}^Q=7.215 {mathrm{m}}^3/mathrm{s} $$&lt;/annotation&gt;\u0000 &lt;/semantics&gt;&lt;/math&gt;). Principal component analysis (PCA) further validated these results, demonstrating that prolonged and stab","PeriodicalId":13189,"journal":{"name":"Hydrological Processes","volume":"39 10","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145228019","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Unravelling Groundwater Storage Dynamics and Implication for River–Aquifer Interactions: A Nested-Watershed Analysis in the Headwater Region of the Upper Blue Nile Basin, Ethiopia","authors":"Zena Tessema Terefe,&nbsp;Nigussie Haregeweyn,&nbsp;Mitsuru Tsubo,&nbsp;Ayele Almaw Fenta,&nbsp;Ashebir Sewale Belay,&nbsp;Taye Minichil Meshesha,&nbsp;Belay Birhanu Bizuneh,&nbsp;Samuel Berihun Kassa,&nbsp;Yoseph Buta Hailu,&nbsp;Endawoke Mulu Gelaw,&nbsp;Alebachew Tareke Kehali,&nbsp;Getnet Taye Bawoke,&nbsp;Atsushi Tsunekawa","doi":"10.1002/hyp.70284","DOIUrl":"https://doi.org/10.1002/hyp.70284","url":null,"abstract":"<div>\u0000 \u0000 <p>Understanding aquifer storage characteristics is critical for revealing river–aquifer interactions and is thus essential for effective water resource management. Hydrological studies often analyse watersheds as single units, potentially overlooking spatial variability in groundwater storage, especially in diverse hydrogeological settings. This study examines groundwater storage dynamics and river–aquifer interactions in the Chemoga watershed, Ethiopia, using a nested-watershed approach. Groundwater level data from eight monitoring stations and streamflow data from five gauging stations were integrated to assess groundwater storage dynamics. The Wilcoxon test revealed significant spatial variations (<i>p</i> &lt; 0.05) in median groundwater levels from 1.3 to 17 m, exhibiting temporal sensitivity with a coefficient of variation of 18%–55%. When analysed as a single unit, the watershed exhibited a mean annual storage of 191 mm year⁻¹. However, the nested-watershed approach uncovered a wide range of mean annual storage values, from −302 to +1777 mm year⁻¹. Negative storage changes were observed in highland sub-watersheds (GS1, GS2) and the Wuseta River sub-watershed (GS4), whereas positive changes occurred in the midland floodplain (GS3) and lowland valley (GS5). These findings indicate that the Chemoga River acts as a gaining stream in the highlands but transitions to a losing stream in the midland floodplain and lowland valley. Additionally, a 1-month lag in baseflow response and hydro–stratigraphic evidence suggest potential lateral flow from GS3 to GS4 sub-watershed. This study highlights the limitations of treating watersheds as single units and advocates for spatially explicit approaches to better understand groundwater storage dynamics and river–aquifer interactions in complex hydrogeological environments.</p>\u0000 </div>","PeriodicalId":13189,"journal":{"name":"Hydrological Processes","volume":"39 10","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145228018","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Stream Temperature Response to Riparian Buffer Configurations: A Replicated Experiment Across Oregon's Coast Range","authors":"Alex W. Foote,&nbsp;Ashley M. Sanders,&nbsp;Ashley A. Coble,&nbsp;Dana R. Warren","doi":"10.1002/hyp.70278","DOIUrl":"https://doi.org/10.1002/hyp.70278","url":null,"abstract":"<p>Riparian buffers provide many important functions for streams, including shade to limit water temperature increases after forest harvest. Conventional buffer designs often designate a minimum width, but alternative configurations such as hydrologically adaptive variable retention or canopy gaps buffers may enhance stream productivity by introducing heterogeneity in stream light whilst still providing thermal buffering, shade, and large wood recruitment. Therefore, alternative buffer designs may be an important climate adaptation strategy. To better understand stream temperature responses to conventional and novel alternative riparian buffer configurations, we conducted a large-scale before-after control-impact experiment across 28 streams in western Oregon. We established six replicate stream blocks that each included five streams: an uncut reference stream and four streams with different riparian buffer designs (Fixed-Width, Standard Practise, Variable Retention, and Canopy Gaps). Prior to treatment, all streams were well shaded (mean effective shade = 96.2%), post-treatment percent shade was reduced by up to 31.4 percentage points. Mixed effect model estimates indicated a 7 day moving average of daily maxima temperatures (T7Max) increased post-treatment by 0.89°C, 0.94°C, 0.79°C, and 0.42°C in Fixed-Width, Standard Practise, Variable Retention, and Canopy Gaps treatments, respectively, but did not differ amongst treatments. Stream temperature response was explained by both percent reduction in effective shade and bankfull width, indicating stream temperature was more sensitive to reductions in shade in smaller streams. We found Variable Retention and Fixed-Width buffers, but not buffers with Canopy Gaps, increased longitudinal temperature variability. Our findings suggest that novel alternative buffers were as protective of temperature as conventional buffers whilst allowing flexibility in application. Therefore, these hydrologically adaptive Variable Retention or Canopy Gaps alternatives may be viable tools to both limit temperature increases and enhance variation in light conditions.</p>","PeriodicalId":13189,"journal":{"name":"Hydrological Processes","volume":"39 10","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/hyp.70278","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145228091","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Streamflow Projections in Valgrosina Valley: Climate Change Calls for Adaptation in the Alpine Region","authors":"Andrea Citrini,&nbsp;Adriana Bruggeman,&nbsp;Ioannis Sofokleous,&nbsp;George Zittis,&nbsp;Georgia Lazoglou,&nbsp;Giovanni P. Beretta,&nbsp;Corrado A. S. Camera","doi":"10.1002/hyp.70276","DOIUrl":"https://doi.org/10.1002/hyp.70276","url":null,"abstract":"<p>Climate change is increasingly impacting mountainous regions, emphasising the need for reliable streamflow projections to support adaptive hydropower management. This study focuses on the Valgrosina Valley (Northern Italy) with two main objectives: (i) to project impacts on streamflow under four global warming levels (+1.5°C, +2.0°C, +3.0°C, and + 4.0°C relative to pre-industrial conditions) and to evaluate their effects on gross hydropower potential (GHP); and (ii) to compare the performance of two bias-correction approaches—yearly vs. monthly quantile delta mapping (QDM-y and QDM-mo, respectively)—on hydrological projections. Daily precipitation and temperature timeseries from 21 regional climate models (approximately 12.5 km² resolution) were bias-corrected and downscaled using observed data from the 2005–2020 reference period and then used to drive reference and future simulations that reveal pronounced intra-annual shifts relative to the reference period. Under the most severe warming scenario (+4.0°C), winter flows are projected to increase by approximately +0.5 m³ s⁻¹ (around +300%), while summer flows decline by about −0.7 m³ s⁻¹ (−19% to −20.5%), indicating a strong seasonal redistribution of runoff. Correspondingly, the GHP indicated a summer potential decline of up to 20% in energy production. The QDM-mo bias correction approach performed better than QDM-y in preserving intra-annual variability with 14% and 3% less bias than the observed series for precipitation and temperature, respectively. The results underline the vulnerability of hydropower systems to future climatic changes and emphasise the need for adaptive strategies to ensure sustainable use of water and energy in Alpine environments.</p>","PeriodicalId":13189,"journal":{"name":"Hydrological Processes","volume":"39 10","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/hyp.70276","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145228092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Stable Water Isotope Signal of Snow Meltwater: Testing Three Different Measurement Setups in Boreal-Subarctic Conditions","authors":"Charlotte Ditlevsen,&nbsp;Hannu Marttila,&nbsp;Pertti Ala-aho","doi":"10.1002/hyp.70277","DOIUrl":"https://doi.org/10.1002/hyp.70277","url":null,"abstract":"<p>Snowmelt plays a vital role in the hydrological cycle of high-latitude and high-altitude regions, contributing to spring runoff, groundwater recharge and regional water resources. In snow-dominated regions, accurate estimates of snowmelt contributions are essential for water resource management, flood risk assessments and ecosystem health. The stable water isotope composition (<i>δ</i>²H and <i>δ</i>¹⁸O) of snow and snowmelt provides valuable insights into the processes affecting water sources. The choice of field sampling method and the evolution of isotopic signatures over time can introduce considerable uncertainties into hydrological analyses. This study addresses two research questions: (1) How does the isotopic signal evolve between different stages of the snow during the season? and (2) How do different sampling instruments and methodologies influence the estimated isotopic composition of snowmelt? The research focuses on two distinct boreal and subarctic environments in Northern Finland, comparing three meltwater sampling techniques using a snow lysimeter, passive capillary sampler (PCS) and funnel-bottle setup. These methods offer different temporal resolutions, from high-resolution daily sampling to bulk seasonal sampling of cumulative meltwater. Comparing data from different snow season stages (snowfall, snowpack and snowmelt) revealed a gradual enrichment in heavy isotopes. The study highlights the importance of selecting optimal snowmelt sampling methods based on the specific environmental conditions of the site. This selection is critical for minimising biases and improving the accuracy of snowmelt contribution in hydrological models. The isotopic data showed variations in snowmelt isotopic signatures, with differences between sampling setups and study sites. These findings underscore the importance of using representative snowmelt samples to enhance the reliability of isotope-based data analysis and hydrological models. Ultimately, this research will improve water resource assessments in the context of climate change and provide a more nuanced understanding of snowmelt processes. The application of stable isotopes in snowmelt studies provides insights that are relevant for water management.</p>","PeriodicalId":13189,"journal":{"name":"Hydrological Processes","volume":"39 10","pages":""},"PeriodicalIF":2.9,"publicationDate":"2025-10-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/hyp.70277","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145228094","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}