Hydrological Processes最新文献

{"title":"Hidden Features: How Subsurface and Landscape Heterogeneity Govern Hydrologic Connectivity and Stream Chemistry in a Montane Watershed","authors":"Keira Johnson,&nbsp;Kenneth H. Williams,&nbsp;John N. Christensen,&nbsp;Rosemary W. H. Carroll,&nbsp;Li Li,&nbsp;Curtis Beutler,&nbsp;Kenneth Swift Bird,&nbsp;Wenming Dong,&nbsp;Pamela L. Sullivan","doi":"10.1002/hyp.70085","DOIUrl":"https://doi.org/10.1002/hyp.70085","url":null,"abstract":"<div>\u0000 \u0000 <p>Hydrologic connectivity is defined as the connection among stores of water within a watershed and controls the flux of water and solutes from the subsurface to the stream. Hydrologic connectivity is difficult to quantify because it is goverened by heterogeniety in subsurface storage and permeability and responds to seasonal changes in precipitation inputs and subsurface moisture conditions. How interannual climate variability impacts hydrologic connectivity, and thus stream flow generation and chemistry, remains unclear. Using a rare, four-year synoptic stream chemistry dataset, we evaluated shifts in stream chemistry and stream flow source of Coal Creek, a montane, headwater tributary of the Upper Colorado River. We leveraged compositional principal component analysis and end-member mixing to evaluate how seasonal and interannual variation in subsurface moisture conditions impacts stream chemistry. Overall, three main findings emerged from this work. First, three geochemically distinct end members were identified that constrained stream flow chemistry: reach inflows, and quick and slow flow groundwater contributions. Reach inflows were impacted by historic base and precious metal mine inputs. Bedrock fractures facilitated much of the transport of quick flow groundwater and higher-storage subsurface features (e.g., alluvial fans) facilitated the transport of slow flow groundwater. Second, the contributions of different end members to the stream changed over the summer. In early summer, stream flow was composed of all three end members, while in late summer, it was composed predominantly of reach inflows and slow flow groundwater. Finally, we observed minimal differences in proportional composition in stream chemistry across all four years, indicating seasonal variability in subsurface moisture and spatial heterogeneity in landscape and geologic features had a greater influence than interannual climate fluctuation on hydrologic connectivity and stream water chemistry. These findings indicate that mechanisms controlling solute transport (e.g., hydrologic connectivity and flow path activation) may be resilient (i.e., able to rebound after perturbations) to predicted increases in climate variability. By establishing a framework for assessing compositional stream chemistry across variable hydrologic and subsurface moisture conditions, our study offers a method to evaluate watershed biogeochemical resilience to variations in hydrometeorological conditions.</p>\u0000 </div>","PeriodicalId":13189,"journal":{"name":"Hydrological Processes","volume":"39 3","pages":""},"PeriodicalIF":3.2,"publicationDate":"2025-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143622380","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":"Understanding Hydrological Process Change due to Re-Vegetation in a Mountainous Watershed of Northern China","authors":"Fan Zhou,&nbsp;Shengping Wang,&nbsp;Siyi Qu,&nbsp;Wenxin Li,&nbsp;Desheng Cai,&nbsp;Qingfeng Hai,&nbsp;Mengyao Ma,&nbsp;Peter Strauss,&nbsp;Zhiwei Wang,&nbsp;Yi Ren,&nbsp;Liping Zhang","doi":"10.1002/hyp.70103","DOIUrl":"https://doi.org/10.1002/hyp.70103","url":null,"abstract":"<div>\u0000 \u0000 <p>Hydrological processes of mountainous watersheds commonly impact water resource supply in downstream areas. To better understand how re-vegetation affects the different hydrological pathways of watersheds, we investigated their change at various temporal scales for the Xiaoluan River watershed, a typical meso-scale watershed featuring a plateau–mountain transition topography in northern China. For the non-growing season from 2006 to 2020, the groundwater discharge of the watershed and the wetting of the watershed in terms of the Horton Index significantly increased, and the recession process in terms of the recession coefficient (<i>k</i>) was considerably prolonged. We suggest that re-vegetation and snowmelt were responsible for this change, but they affected the hydrological processes differently. That is, re-vegetation might improve the water storage capacity of the shallow soil layers of the watershed, thereby enhancing the capacity of groundwater recharge and discharge. Meanwhile, snowmelt may provide available water for recharging and discharging the watershed. Because reforestation progresses and global climate change continues, more complex hydrological processes are to be expected. Therefore, continuous monitoring and detailed investigations of subsurface hydrological processes will be necessary for adaptive watershed management.</p>\u0000 </div>","PeriodicalId":13189,"journal":{"name":"Hydrological Processes","volume":"39 3","pages":""},"PeriodicalIF":3.2,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143595343","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":"The Impact of Agricultural Land Cover Change on Soil Hydraulic Properties: Implications for Runoff Generation","authors":"Nicola Mathura,&nbsp;Wanika Arnold,&nbsp;Lahteefah James,&nbsp;Kegan K. Farrick","doi":"10.1002/hyp.70102","DOIUrl":"https://doi.org/10.1002/hyp.70102","url":null,"abstract":"<div>\u0000 \u0000 <p>Infiltration and hydraulic conductivity (<i>K</i>) play a key role in streamflow generation and groundwater recharge. The impact of agriculture on soil infiltration and <i>K</i> has been widely investigated. While many studies show decreases in infiltration and <i>K</i>, others show an increase or no change in both parameters. These variations highlight the importance of conducting local scale investigations. We investigated the impact of agricultural development and land cover changes on infiltration and <i>K</i>. Unsaturated hydraulic conductivity (<i>K</i>_unsat) was measured at the soil surface during both dry and wet seasons, and saturated hydraulic conductivity (<i>K</i>_sat) was measured at 25, 45, and 65 cm below the surface. Our results show that there were no significant differences in <i>K</i>_unsat between perennial crop cover and natural forests; however, agroforests did have significantly higher <i>K</i>_unsat than natural forests, which was attributed to higher soil moisture. There were no significant differences in <i>K</i>_sat among the perennial crops, agroforests, and natural forests at the 45 and 65 cm depths; however, at 25 cm, natural forests had significantly higher <i>K</i>_sat, which was attributed to the higher soil organic matter and lower bulk density in natural forest. The study showed that the impacts of agriculture and land cover change on <i>K</i>_sat do not extend to deeper soil layers. We used 2 years of rainfall intensity data, observed <i>K</i>_unsat and <i>K</i>_sat, and HYDRUS-1D modelling to infer any changes to runoff. We show that footpaths and perennial crop cover may generate more surface runoff than natural forests. This study adds to the literature on agricultural impacts on infiltration and <i>K</i>. More importantly, it shows that differences in crop type, management practices, and topographic location all play an important role on infiltration and K, showing the need for local field-based studies.</p>\u0000 </div>","PeriodicalId":13189,"journal":{"name":"Hydrological Processes","volume":"39 3","pages":""},"PeriodicalIF":3.2,"publicationDate":"2025-03-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143595332","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":"Numerical Modelling of Groundwater Flow in an Urban Aquifer Under Extensive Artificial Recharge Forcings","authors":"Ameerah H. Alkandari,&nbsp;Abdullah A. Alsumaiei","doi":"10.1002/hyp.70100","DOIUrl":"https://doi.org/10.1002/hyp.70100","url":null,"abstract":"<div>\u0000 \u0000 <p>With a steadily growing population and increasingly limited natural freshwater resources, water-scarce regions must implement smart interventions to sustainably manage their water resources. Using Groundwater Vistas software, a modelling framework for Kuwait City urban aquifer was developed to address this issue. This framework was employed to create a numerical model of the shallow aquifer beneath the urbanised aquifer of Kuwait City. The model was calibrated using groundwater levels from 15 calibration points across the modelled area. Two key factors influenced the calibration: the constant head boundary condition applied upstream in the model domain and the horizontal hydraulic conductivity. The model performed satisfactorily achieving a Nash-Sutcliffe efficiency coefficient of 0.983, a root-mean-square error of 1.134 m, and a Kling-Gupta efficiency of 0.971. These results were then used to simulate two complex hydrogeological processes affecting the Kuwait City aquifer: unplanned dewatering schemes and incidental recharge from anthropogenic watering practices. It was found that altering the pumping rate between 250 and 2250 m³/day, resembling the dewatering process, could lower the groundwater level by approximately 1.21–1.79 m in coastal areas. Conversely, an unplanned recharge of 1500–6000 m³/day could substantially raise groundwater levels by approximately 2.5–3 m in inland areas. However, these findings should be cautiously approached, as certain constraints may significantly influence the model's reliability. These constraints include the limited availability of data records and the possible existence of unknown sources/sinks to the aquifer. The outcomes of this study should aid water managers in establishing reliable groundwater control decisions in the study area and other areas with similar hydrogeologic characteristics.</p>\u0000 </div>","PeriodicalId":13189,"journal":{"name":"Hydrological Processes","volume":"39 3","pages":""},"PeriodicalIF":3.2,"publicationDate":"2025-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143564853","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":"Analytical Model of Groundwater Flow in a Rectangular Domain for Spatiotemporally Distributed Recharge","authors":"Ping-Cheng Hsieh,&nbsp;Po-Wen Yu,&nbsp;Ming-Chang Wu","doi":"10.1002/hyp.70004","DOIUrl":"https://doi.org/10.1002/hyp.70004","url":null,"abstract":"<div>\u0000 \u0000 <p>This study introduces a reliable analytical solution to the two-dimensional linearised Boussinesq equation, applicable to groundwater flow in an anisotropic rectangular aquifer over an impervious stratum. Validation is performed using a numerical solution based on the finite difference method for the nonlinear Boussinesq equation. Additionally, the proposed two-dimensional analytical model for finite or semi-infinite domains effectively estimates groundwater level changes due to diffuse recharge, with converging simulation results as the finite domain size increases. By incorporating Horton's equation to represent the spatiotemporally varying diffuse recharge, the study provides a more accurate method for estimating groundwater level fluctuations, allowing the model to simulate real-world recharge patterns more effectively than previous analytical models. The analytical simulations for groundwater level estimations in the Zeng Wen river basin agree well with field data and display that the peak groundwater levels shift in the <span></span><math>\u0000 <semantics>\u0000 <mrow>\u0000 <mi>x</mi>\u0000 </mrow>\u0000 <annotation>$$ x $$</annotation>\u0000 </semantics></math> direction at both observation stations, with a time lag of approximately 2–5 days, demonstrating its applicability in predicting groundwater levels under various hydrological and geological conditions. This suggests that the current model offers advantages over previous analytical methods, such as greater accuracy and efficiency, allowing for quicker assessments and broader applicability to various recharge patterns and aquifer conditions.</p>\u0000 </div>","PeriodicalId":13189,"journal":{"name":"Hydrological Processes","volume":"39 3","pages":""},"PeriodicalIF":3.2,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143554325","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":"Assessing the Spatiotemporal Applicability of IsoGSM2 for Simulating Precipitation Isotope Compositions: A Multi-Timescale Analysis","authors":"Haichen Zhao,&nbsp;Liangju Zhao,&nbsp;Cong Xie,&nbsp;Keke Ma,&nbsp;Yuye Qin","doi":"10.1002/hyp.70097","DOIUrl":"https://doi.org/10.1002/hyp.70097","url":null,"abstract":"<div>\u0000 \u0000 <p>Stable isotope in precipitation plays a crucial role in comprehending the water cycle. Isotope-enabled General Circulation Models (iGCMs) can continuously simulate the compositions of stable hydrogen and oxygen isotopes (δ²H and δ¹⁸O) in precipitation. The Isotope-incorporated Global Spectral Model Version 2 (isoGSM2), one of the iGCMs, has been widely used in related research. Here, we use the measured δ¹⁸O records (δ¹⁸O_O) of 21 long-term monitoring stations from the Global Network of Isotopes in Precipitation and modelled δ¹⁸O (δ¹⁸O_M) from isoGSM2 to compare δ¹⁸O_M with δ¹⁸O_O at different time intervals (monthly, annual) for the whole year (MD, AD), rainy season (RSM, RSA) and dry season (DSM, DSA). The results showed that isoGSM2 has good performance in the northern part of Oceania, southeastern Asia, central Europe, eastern North America, Greenland and northern South America across all temporal scales, but the correlations at the other stations vary depending on the timescale. The RMSE and correlation between δ¹⁸O_M and δ¹⁸O_O were better for the rainy season than for the dry season. The relationship between δ¹⁸O_M and temperature was consistent with δ¹⁸O_O for both the MD and RSM, as well as the relationship between δ¹⁸O_M and precipitation amount for the MD. The deviation between simulated and observed values is associated with the accuracy of the model's simulation of rainfall and temperature, as well as the real environmental conditions. In addition, isoGSM2 may have a high correlation at sites where AO and ENSO are significantly affected. These findings are valuable for understanding isoGSM2's applicability and enhance the understanding and knowledge of stable isotopes in the water cycle.</p>\u0000 </div>","PeriodicalId":13189,"journal":{"name":"Hydrological Processes","volume":"39 3","pages":""},"PeriodicalIF":3.2,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143497102","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":"Injected Tracer Reveals Differences in Water Transport Rate, Residence Times and Mixing Dynamics in Tree Species of Contrasting Water Management Strategies","authors":"Mikaela Maneely,&nbsp;Keith Reinhardt,&nbsp;Ryan E. Emanuel,&nbsp;Kevan J. Minick,&nbsp;Jennifer Bahramian,&nbsp;Lauren M. Tucker,&nbsp;Daniel M. Johnson","doi":"10.1002/hyp.70091","DOIUrl":"https://doi.org/10.1002/hyp.70091","url":null,"abstract":"<div>\u0000 \u0000 <p>Studies have shown that water can reside inside trees for up to several months, but how the duration of long-term stored water relates to species-specific water management strategies is not known. We studied water residence time, tracer velocity, and internal mixing in two tree species with differing water management strategies by injecting deuterated water into Douglas fir (<i>Pseudotsuga menziesii</i>) and trembling aspen (<i>Populus tremuloides</i>) trees and then monitoring tracer concentration daily in leaves for several weeks postinjection. In a companion study, we injected tracer and collected leaves at subdaily timescales to explore subdaily patterns of tracer arrival in canopy leaves. For the first experiment, we hypothesised that the tracer would remain in both species for days to weeks and that the tracer would have a longer residence time in the more isohydric Douglas fir trees. For the subdaily study, we explored if the tracer would arrive at a sharp peak, or be more spread out over time. The tracer resided in the trees 7–11 days for both species. Interestingly, the tracer reached the canopy leaves of aspen sooner yet remained in trees for longer compared to Douglas fir, which exhibited sharp pulses of tracer breakthrough in canopies. Surprisingly, the tracer arrival in aspens occurred in two distinct pulses, separated by 1–2 days. Combined, the results from both experiments suggest that water inside trees may not flow in simple ‘in-up-and-out’ (i.e., piston flow) ways and that complex mixing of water reservoirs and water flow paths may occur in some tree species.</p>\u0000 </div>","PeriodicalId":13189,"journal":{"name":"Hydrological Processes","volume":"39 3","pages":""},"PeriodicalIF":3.2,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143497101","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":"Influence of Hydrogeological and Climatic Conditions on Piston Flow in Karst Aquifers Using Statistical Approach","authors":"Javad Ashjari,&nbsp;Alan E. Fryar,&nbsp;Benjamin Tobin,&nbsp;Zohreh Ashjari","doi":"10.1002/hyp.70090","DOIUrl":"https://doi.org/10.1002/hyp.70090","url":null,"abstract":"<div>\u0000 \u0000 <p>Piston flow is a term used to describe the phenomenon of the pressure pulse during pipe-full flow in karst conduits. During piston flow, as dilute meteoric recharge displaces water present in the conduits, discharge increases and specific conductance decreases at karstic springs. The aim of this research is to gain a deeper understanding of how piston flow can be identified on a global scale. To achieve this, the study has defined six phases (stable, lag, hydraulic pressure, mobilisation, dilution and recovery) based on the pattern of hydrographs and specific conductivity time series. Data from 69 flood events at 42 different locations worldwide have been collected and analysed. This analysis considered various factors such as lithology, aquifer type, allogenic or autogenic recharge, precipitation amount and intensity, dry period before storm, hydrograph shape and recession coefficient, specific-conductance time series parameters, memory effect, regulation time and typology of hysteresis loop in order to determine if groups could be differentiated using these parameters. The flood events were classified into two main groups: those with piston flow and those without. Furthermore, the cases with piston flow were categorised into five subgroups based on the location of mobilised stored water. The results show that piston flow can be observed in any karst setting, climatic region and hydrological situation, although it is more likely to occur during extended dry periods preceding a storm, periods of high precipitation and intense rainfall. The mobilised stored water is most likely found in the phreatic zone, but could also be present in the soil or epikarst zone. The occurrence of piston flow depends on the storage capacity of the matrix as well as the development of conduit systems that do not significantly weaken the hydraulic function of the matrix. The typology of hysteresis in piston flow is primarily influenced by the presence of pre-event water or a mixture of pre-event and event water, whereas in systems without piston flow, it is mainly affected by event water.</p>\u0000 </div>","PeriodicalId":13189,"journal":{"name":"Hydrological Processes","volume":"39 3","pages":""},"PeriodicalIF":3.2,"publicationDate":"2025-02-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143497225","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":"Determining the Groundwater Level in Hilly and Plain Areas From Multisource Observation Data Combined With a Machine Learning Approach","authors":"Jiahao Li,&nbsp;Chengpeng Lu,&nbsp;Jingya Hu,&nbsp;Yufeng Chen,&nbsp;Jialiang Ma,&nbsp;Jing Chen,&nbsp;Chengcheng Wu,&nbsp;Bo Liu,&nbsp;Longcang Shu","doi":"10.1002/hyp.70088","DOIUrl":"https://doi.org/10.1002/hyp.70088","url":null,"abstract":"<div>\u0000 \u0000 <p>Developing an accurate model that can effectively simulate groundwater levels is of immense significance for water resource management and aquifer protection. To achieve this, it is crucial to identify key factors in remote sensing, topography, and meteorology, and to improve hydrological models to enhance prediction accuracy. This study proposes a multistep modelling framework, the RF-PSO-GRNN algorithm model, to improve the accuracy of groundwater level simulations in data-scarce hilly regions. The framework combines the random forest (RF) model with the particle swarm optimization (PSO) algorithm and the generalised regression neural network (GRNN). First, the study area was divided into hilly and plain regions, decreasing mean absolute error (MAE) by 0.2 m in plain areas and 0.1 m in hilly areas. The RF-Gini index combination was then used to calculate the contributing factors for each region, facilitating the determination of an optimal balancing strategy, which reduced RMSE by 4.35 m in hilly areas and 3.82 m in plain areas. Subsequently, the PSO algorithm was employed to compute the optimal smoothing factor for GRNN, further reducing RMSE by approximately 10 m. Additionally, MAE decreased by 11 m in hilly areas and 7.5 m in plain areas. Finally, the RF-PSO-GRNN model was applied to simulate the spatiotemporal evolution of groundwater levels in three counties within the Fu River Basin of Jiangxi Province, China. The findings confirm the effectiveness of GRNN in simulating groundwater levels with limited data samples. This study provides a practical solution for hydrological modelling and groundwater management under data-scarce conditions, contributing to the understanding and predicting groundwater dynamics.</p>\u0000 </div>","PeriodicalId":13189,"journal":{"name":"Hydrological Processes","volume":"39 2","pages":""},"PeriodicalIF":3.2,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143475563","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":"Introduction to the 2023 Canadian Geophysical Union Special Issue of Hydrological Processes","authors":"Lauren Somers,&nbsp;Barret Kurylyk","doi":"10.1002/hyp.70095","DOIUrl":"https://doi.org/10.1002/hyp.70095","url":null,"abstract":"&lt;p&gt;Fifteen new research papers from Canadian researchers are published in this special issue of &lt;i&gt;Hydrological Processes&lt;/i&gt;. This represents an increase in papers over the 2022 special issue following the resumption of in-person meetings of the Canadian Geophysical Union (CGU) after the COVID-19 pandemic. We are delighted to see the rebound in special issue submissions. The 2023 Annual Meeting of the CGU was held in May 2023 in Banff, Alberta. This special issue includes research presented at that conference and previous CGU conferences by members of the CGU Hydrology Section. Twelve of the 15 papers include graduate students as first authors. Student engagement in the special issue is a point of pride for the CGU Hydrology Section, given our emphasis on providing opportunities for students. We thank &lt;i&gt;Hydrological Processes&lt;/i&gt; for their continued partnership.&lt;/p&gt;&lt;p&gt;The CGU comprises four sections (Biogeosciences, Geodesy, Hydrology and Solid Earth), of which Hydrology is the largest. Established in 1993, the Hydrology Section aims to (1) promote hydrology as a geophysical science, (2) initiate research and education programmes in hydrology, (3) develop national and international cooperation among like-minded organisations and (4) disseminate research results and knowledge to the public. This special issue of &lt;i&gt;Hydrological Processes&lt;/i&gt; is one such dissemination mechanism. The CGU Hydrology Section also nominates Canadian hydrology representatives for the National Committee of the International Union of Geodesy and Geophysics.&lt;/p&gt;&lt;p&gt;Canadian hydrologists are well-known for their work on hydrological processes in cold regions. As usual, cold regions were a through-line in this year's special issue, with many studies considering cryosphere processes. Three papers centred on snow and ice-related themes. Bertoncini and Pomeroy focused on improving glacio-hydrological modelling by enhancing a model to consider the impacts on albedo caused by recent wildfires and heatwaves. Assimilating remotely sensed albedo data into a glacio-hydrological model of two Rocky Mountain catchments improved the model performance during wildfires but not during heatwaves. The Kling Gupta Efficiency of the model increased by 0.18–0.2 overall. Groff and Pomeroy considered infiltration into seasonally frozen, sloping soils to better understand snowmelt infiltration in mountain environments. They used eight years of soil moisture and meteorological data from their Rocky Mountain study site to characterise the infiltration patterns using a newly developed infiltration equation for use in mountain settings. Warden et al. simulated the occurrence of rain-on-snow events in a subarctic river basin in northwestern Canada under current and future climates. Rain-on-snow events can intensify runoff and exacerbate flooding. They projected an increasing frequency of rain-on-snow events in the summer and fall, particularly at higher elevations, and a decrease and uncertain changes i","PeriodicalId":13189,"journal":{"name":"Hydrological Processes","volume":"39 2","pages":""},"PeriodicalIF":3.2,"publicationDate":"2025-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/hyp.70095","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143475833","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}