Ecohydrology最新文献

{"title":"Variation in hydropeaking-induced stranding of Barbus barbus L. and Chondrostoma nasus L. larvae: Assessing the impact of daytime and down-ramping rates","authors":"Simon Führer,&nbsp;Stefan Auer,&nbsp;Anna Coudrais-Duhamel,&nbsp;Antonin Olejarz,&nbsp;Felix Stoisser,&nbsp;Stefan Schmutz,&nbsp;Daniel S. Hayes","doi":"10.1002/eco.2626","DOIUrl":"10.1002/eco.2626","url":null,"abstract":"<p>Unnatural changes in river flow patterns resulting from peak-operating hydropower plants adversely impact freshwater ecosystems. In particular, the rapid dewatering of shoreline habitats during artificial flow down-ramping puts early fish life stages at a high risk of becoming stranded if they fail to follow receding water levels in time. While extensive research has been conducted on the effects of hydropeaking on salmonid species, there is limited knowledge on the diverse cyprinid family, particularly on vulnerable early life stages. Hence, this study aims to compare the larval stranding of two cyprinid species, the common barbel (<i>Barbus barbus</i> L.) and common nase (<i>Chondrostoma nasus</i> L.), in response to bank dewatering. We conducted larvae experiments in near-natural mesocosms, simulating single flow down-ramping events with varying down-ramping rates (0.3–1.8 cm·min⁻¹) during the day and at night to quantify stranding rates, also including water temperature and fish development. Our results reveal distinct diurnal patterns for both species, with higher stranding rates during the night than during the day in all experimental scenarios. The data also show higher stranding rates at faster down-ramping, with interaction effects between down-ramping rates and time of day. The stranding rates between the two species are similar across most of the scenarios. Scenarios with colder water temperatures show that nase larvae tend to strand more frequently than with warmer temperatures. In conclusion, the study results contribute to the ongoing discourse on hydropeaking mitigation by providing new perspectives on flow-reduction effects on early cyprinid life stages. Mitigation measures should prioritize the periods during early larval development and factor in prevailing water temperatures. Lowering down-ramping rates, especially during nighttime, will help minimizing negative impacts on aquatic ecosystems, particularly when combining flow rules and habitat restoration measures.</p>","PeriodicalId":55169,"journal":{"name":"Ecohydrology","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eco.2626","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139669253","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Diffusion properties of buoyant particle cluster in open channel flow with emergent rigid vegetation","authors":"Liu Xiaoguang,&nbsp;Zeng Yuhong,&nbsp;Wang Jiasheng","doi":"10.1002/eco.2628","DOIUrl":"10.1002/eco.2628","url":null,"abstract":"<p>Convection and diffusion processes of buoyant organisms are of great significance to ecological restoration or the restoration of the riparian and wetland system. Advection–diffusion models have been widely applied to describe the transport of particles through vegetation, assuming that the particle transport is driven by the mean flow, but few studies have been conducted on the diffusion process while considering the retention time. The authors conducted flume experiments of four runs with different vegetative densities and extracted and analysed the longitudinal moving and lateral oscillation trajectories of buoyant particles. The trapping and releasing mechanisms of buoyant particles due to capillary force were explored, and a dimensionless parameter is defined to reflect the effect of the physical properties of stems and particles on the retention time. The retention time of trapping events due to the capillary force between particles and the stem has been proven to follow a three-parameter double exponential distribution, the duration time of both short and long retention events increases with the bulk flow velocity, and the proportion of long trapping events decreases with the increasing bulk flow velocity. The diffusion coefficient of buoyant particles is validated independently from the vegetative densities, increases with the flow velocity, and is approximately 100 times that of the solute in the flow through emergent vegetation under similar condition.</p>","PeriodicalId":55169,"journal":{"name":"Ecohydrology","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139657485","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Riffle algal and macroinvertebrate recovery from wet-season flood disturbance in a tropical savannah river, Northern Australia","authors":"Simon Townsend","doi":"10.1002/eco.2617","DOIUrl":"10.1002/eco.2617","url":null,"abstract":"<p>Succession occurs when river biota recovers from the loss of biomass and diversity caused by flood disturbance, and has rarely been examined in the tropical savannah biome. Hypotheses are tested which address the environmental context and recovery of riffle macroinvertebrates in an Australian perennial, tropical savannah river, located in a catchment with low anthropogenic impact. Recovery occurred over a 32-week dry-season period of gradually declining discharge with near-stable water quality, after a 23-week wet-season flood-disturbance period, which was typical of the river's flow regime. Prolonged, benign environmental conditions during recovery facilitated the accrual of macroalgae. Macroinvertebrate abundance, mediated by macroalgal biomass, and diversity increased at a logarithmic, asymptotic rate over the recovery period. Macroinvertebrate assemblages and functional feeding groups (FFGs) tended to become more similar between consecutive sample dates as recovery progressed, though with variable abundances of core taxa (Orthocladiinae, Hydropsychidae, <i>Orthotrichia</i>, Chironominae and Pyralidae) and prominence of <i>Hydroptila</i> late in the recovery period. Filterer abundances fluctuated most, whilst the relative abundance of herbivorous shredders and predators generally increased. The return of macroinvertebrate abundance and diversity to its pre-disturbance state is attributed to the similar pre- and post-disturbance environmental conditions. Recovery broadly agreed with the secondary succession paradigm for macroinvertebrates. Macroinvertebrate succession was probably driven mainly by biotic factors, after the initial colonisation period. However, this requires elucidation and expansion of the current paradigm of river benthic succession from flood disturbance to address macroinvertebrate population dynamics under benign abiotic environmental conditions.</p>","PeriodicalId":55169,"journal":{"name":"Ecohydrology","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139580953","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Hydrodynamic modelling to assess habitat suitability of the Ganga River dolphins","authors":"Gaurav Kailash Sonkar,&nbsp;Kumar Gaurav,&nbsp;Vaibhav Kumar,&nbsp;Zafar Beg","doi":"10.1002/eco.2622","DOIUrl":"10.1002/eco.2622","url":null,"abstract":"<p>The Ganga River hosts a metapopulation of endangered aquatic species. This study uses a hydrodynamic model (HEC-RAS) to assess the habitat suitability of the Ganga River dolphins (GRDs) in a small reach (7.5 km) of the Ganga River at the upstream of Narora barrage in varying flow. We use Lidar points clouds to generate topography, Acoustic Doppler Current Profiler (ADCP), and differential GPS (DGPS) to measure channel bathymetry and streamwise water surface slope. Further, the water level data from satellite altimeter is used to calibrate the model and discharge measured in field to validate the model output. We found that in the high flow period, the required flow depth for dolphin habitat is available throughout in the study reach. However, in the lean flow, the required flow depth and velocity are available only in some patches. The methodology developed here would be very useful in monitoring hydraulic habitat suitability of aquatic species in ungauged rivers.</p>","PeriodicalId":55169,"journal":{"name":"Ecohydrology","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139580907","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Using macroinvertebrate-based biotic indices and diversity indices to assess water quality: A case study on the Karasu Stream (Kastamonu, Türkiye)","authors":"Abdulhamed M. Omar Etriieki,&nbsp;İbrahim Küçükbasmacı","doi":"10.1002/eco.2627","DOIUrl":"10.1002/eco.2627","url":null,"abstract":"<p>Biomonitoring is an approach that uses indicators or sentinel species to assess the health or pollution of an environment, combining diversity based on specific taxonomic groups with the taxa's indicator of pollution into a single index or score. Benthic macroinvertebrates are among the most preferred and valuable indicators of the biotic index. Our study aims to evaluate water quality and ecological status using biotic and diversity indices based on benthic macroinvertebrates. The macroinvertebrate samples used in this study were collected seasonally from 16 stations determined in Karasu Stream. These samples consist of 14,747 specimens belonging to 9 orders and 40 families of Insecta, Malacostraca, Hirudinea and Oligochaeta. In addition, some physicochemical parameters were measured at the stations. The data obtained were analysed using the Turkey-Biological Monitoring Working Group (TR-BMWP), Average Score per Taxon (ASPT), Family Biotic Index (FBI), Ephemeroptera, Plecoptera and Trichoptera (EPT) taxon richness index, and Shannon–Wiener, Simpson and Hill's diversity indices. Our results showed that the last six stations of Karasu Stream were under pressure due to various anthropogenic effects. According to biotic indexes, the ecological quality status of the water in the stations was determined to be high or good in the first 10 stations and average, poor or bad in the last 6 stations. The results of our study showed that TR-BMWP, FBI and EPT indices are more reliable in determining water quality than the ASPT index and reflect the environmental situation better. Since the TR-BMWP index is adapted to macroinvertebrate taxa distributed in Türkiye, it can be used as a suitable tool for evaluating other rivers' water quality in Türkiye.</p>","PeriodicalId":55169,"journal":{"name":"Ecohydrology","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139580948","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Quantitative analysis of hydropower potential in the upper Beas basin using geographical information system and MIKE 11 Nedbor Afrstromnings Model (NAM)","authors":"Mohit Kumar,&nbsp;Reet Kamal Tiwari,&nbsp;Kamal Kumar,&nbsp;Kuldeep Singh Rautela,&nbsp;Sabia Safi","doi":"10.1002/eco.2618","DOIUrl":"10.1002/eco.2618","url":null,"abstract":"<p>The present study aims to identify potential locations for small-scale hydroelectric power (HEP) stations in hilly regions for the purpose of generating renewable energy. A rainfall-runoff (R-R) model of the Beas River catchment was established using the MIKE 11 NAM to estimate the available discharge. The model was calibrated and validated over the period of June-2015–May-2018 and June-2018–May-2020, respectively, using daily observed discharge data at the Pandoh Dam site. The model exhibited good performance with a coefficient of determination (<i>R</i>²) of 0.82 during calibration and 0.70 during validation and a water balance of −0.01% and −18%, respectively. However, L_max, CK₁, CK₂ and CQOF are found most sensitive parameters during the calibration. Further, thirteen major streams of order five or higher were selected for the assessment of hydropower potential, resulting in the identification of 131 potential run-of-river (ROR) hydropower sites. The hydropower potential at two proposed sites, Bhang SHEP (9 MW) and Raison SHEP (18 MW), was estimated to be 11 and 15 MW, respectively, using 90% dependable flow. The results demonstrate the effectiveness of using Digital Elevation Model (DEM) and Geographic Information System (GIS) techniques for determining hydropower potential in ungauged basins in the Himalayas.</p>","PeriodicalId":55169,"journal":{"name":"Ecohydrology","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-01-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139580805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Fish stranding in relation to river bar morphology and baseflow magnitude: Combining field surveys and hydrodynamic–numerical modelling","authors":"Daniel S. Hayes,&nbsp;Christoph Hauer,&nbsp;Günther Unfer","doi":"10.1002/eco.2616","DOIUrl":"10.1002/eco.2616","url":null,"abstract":"<p>Hydropeaking mitigation based on down-ramping thresholds is crucial to avoid stranding of fish and ensure sustainable hydropower production. However, the risk of stranding is influenced by several biotic and abiotic factors that interact with the ramping rate, including river morphology and baseflow magnitude. Also, at the river bar scale, the lateral or horizontal down-ramping velocity may be of even greater importance than the vertical one as the prior integrates bar morphology. This study investigates the connection between ecologically relevant hydraulic parameters (vertical and lateral ramping velocity, dewatered river bar width) and the stranding of young-of-the-year European grayling (<i>Thymallus thymallus</i>) due to down-ramping, based on field observations of stranded fish at the hydropeaked Drava River in Austria combined with hydrodynamic–numerical modelling. We also examine the interplay between baseflow conditions and river topography in the dewatered areas. Stranding observations in spring and summer found a median rate of 90 individuals per 100 m, ranging from 50 to 500 fish per 100 m shoreline. Stranding rates were three times higher at night than during the day. Our data revealed a positive relationship between stranded fish and down-ramping hydraulics, with higher intensity resulting in more stranded fish. This association was stronger for the lateral than the vertical ramping velocity, presumably because the former accounts for bar morphology, suggesting that the lateral dewatering velocity is a better indicator to assess fish stranding at the bar scale than the vertical velocity. We also found a negative relationship between the extent of the dewatered area and baseflow magnitude, indicating that the stranding risk is higher during down-ramping at low flow conditions.</p>","PeriodicalId":55169,"journal":{"name":"Ecohydrology","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eco.2616","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139581105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysing and evaluating environmental flows through hydrological methods in the regulated Indus River Basin","authors":"Kashif Mehmood,&nbsp;Bernhard Tischbein,&nbsp;Rashid Mahmood,&nbsp;Christian Borgemeister,&nbsp;Martina Flörke,&nbsp;Fazlullah Akhtar","doi":"10.1002/eco.2624","DOIUrl":"10.1002/eco.2624","url":null,"abstract":"<p>Environmental flows (EFs), essential for upholding the ecological integrity of rivers and aquatic habitats, have been disrupted significantly by diverting water for agricultural, industrial and domestic uses. This underscores the imperative of implementing sustainable water resource management to harmonize agricultural and environmental needs. The study was conducted in the Indus River Basin (IRB), a region extensively transformed by human interventions. EFs were determined through various techniques, including the flow duration curve shifting method, flow duration curve analysis, low-flow indices, the Tennant method, the Smakhtin approach, the Tessmann method and the Pastor method. Analysing the estimated EFs alongside downstream flows unveiled specific timeframes (days, months and seasons) of unmet EF requirements. To safeguard the downstream ecosystems, the following EFs were estimated for the respective locations: 880 m³/s (38% of the mean annual flow [MAF]) for the Indus River at Tarbela Dam, 412 m³/s (48% of the MAF) for the Jhelum at Mangla Dam, 425 m³/s (44% of the MAF) for the Chenab at Marala headworks, 389 m³/s (56% of MAF) for the Ravi at Balloki headworks, 184 m³/s (50% of MAF) for the Sutlej at Sulemanki headworks and 231 m³/s (38% of MAF) below Kotri Barrage. The study revealed that violations of EFs occurred 41%, 43%, 44% and 52% of the time during the study period for the Chenab at Marala headworks, the Ravi at Balloki headworks, the Sutlej at Sulemanki headworks and the Indus River at the Kotri Barrage, respectively. The results highlighted that the Chenab, Ravi and Sutlej rivers are particularly susceptible to vulnerability, as the estimated EFs were not consistently upheld in these rivers. These findings underscore the urgent need to take appropriate measures to ensure EFs are not violated, thus safeguarding the downstream ecosystems.</p>","PeriodicalId":55169,"journal":{"name":"Ecohydrology","volume":null,"pages":null},"PeriodicalIF":2.5,"publicationDate":"2024-01-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://onlinelibrary.wiley.com/doi/epdf/10.1002/eco.2624","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139580895","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The effect of salinity and altitude on diatom assemblages and ecological status assessment based on diatom indices in the lentic systems of the Western Mediterranean Basin (Türkiye)","authors":"Tuğba Ongun Sevindik,&nbsp;Tolga Çetin,&nbsp;Ayşe Gül Tekbaba,&nbsp;Uğur Güzel","doi":"10.1002/eco.2625","DOIUrl":"10.1002/eco.2625","url":null,"abstract":"<p>In this study, littoral diatoms and environmental variables were sampled three times in 2017 (spring, summer, and autumn) to determine the effect of salinity (SAL) and altitude (ALT) on the littoral diatom assemblages (composition, distribution, species richness and diversity) of 12 lentic systems in the Western Mediterranean Basin. Due to the SAL and ALT differences in these systems, they were distinguished under two groups (high elevated freshwater lentic systems [HEF] and hyposaline lentic systems [HYP]). The Bray–Curtis and Canonical Correspondence (CCA) analyses based on diatom species also confirmed this separation. In HYP, SAL and alkalinity (ALK) were the most effective parameters on diatom assemblage. On the other hand, diatom assemblage was mainly affected by ALT in HEF. For the biological assessment of these systems, seven diatom indices were implemented. Although most of the indices showed higher regression with SAL and ALT, they did not give the intended result in the evaluation of HYP. On the other hand, the most consistent index with environmental variables and dominant species in HEF was the Generic Diatom Index (IDG).</p>","PeriodicalId":55169,"journal":{"name":"Ecohydrology","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139580531","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Study on the resistance characteristics of layered vegetation to overland flow","authors":"Lili Zhang,&nbsp;Shengtang Zhang,&nbsp;Haiping Huang","doi":"10.1002/eco.2621","DOIUrl":"10.1002/eco.2621","url":null,"abstract":"<p>Different types of plants in the vegetation community near the surface of the basin coexist, forming a layered vegetation distribution with high and low plants in the morphology. In order to research the characteristics of flow resistance generated by layered vegetation on slope runoff, a flume experiment was carried out by simulating layered vegetation. The Manning roughness coefficient <i>n</i> was used to characterize the flow resistance of vegetation. Three kinds of vegetation with height combinations of 5 and 7 cm, 6 and 8 cm, and 7 and 9 cm were used for this experiment. By studying the relationship between Manning roughness coefficient <i>n</i> and water depth, it is found that the change of flow resistance of layered vegetation is closely related to the submerged state. The distribution of <i>n</i> shows an inverted “<i>J</i>” type with the increase of water depth. Under the condition of nonsubmerged state and transitional submerged state, <i>n</i> increases with the increase of water depth. The critical point <i>n</i> values of the two states will plummet, and the growth rate of <i>n</i> in the nonsubmerged state is greater than that in the completely submerged state. In the transitional submerged state and completely submerged state, the higher the plant height below the water surface, the higher the corresponding <i>n</i> value and the greater the change rate of <i>n</i>. Formula for predicting overland flow resistance of layered vegetation was established by considering the influence of combined vegetation height and Reynolds number.</p>","PeriodicalId":55169,"journal":{"name":"Ecohydrology","volume":null,"pages":null},"PeriodicalIF":2.6,"publicationDate":"2024-01-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139580527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}