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baseflow variations and its causes in a subtropical watershed of southern China

Journal of Mountain Science 2022年第10期19卷 2817-2829页

作者： LIU Zheng SHENG Fei LIU Shi-yu WANG Yan-yan ZHOU Chang-ming GU Chao-jun School of Land Resources and Environment Jiangxi Agricultural UniversityNanchang 330045China Key Laboratory of Poyang Lake Watershed Agricultural Resources and Ecology of Jiangxi Province Nanchang 330045China College of Resources and Environment Huazhong Agricultural UniversityWuhan 430070China Yangtze River Basin Monitoring Center Station for Soil and Water Conservation Changjiang Water Resources CommissionWuhan 430012China

baseflow is an essential component of streamflow and plays a crucial role in maintaining the stability of ***,few quantitative studies have identified the effects of leading factors on baseflow variation at the small watershed scale,especially in subtropical *** this study,the small watershed(Pengchongjian watershed,2.90 km2),located in Southern China,was considered to explore the quantitative impact of precipitation,evapotranspiration,temperature,and vegetation restoration on *** digital filter method was used to separate baseflow by daily streamflow records from 1983 to *** stepwise regression models were developed for selecting significant influencing factors of baseflow at seasonal and annual *** direct and indirect effects,as well as their quantitative relationships between baseflow and multiple factors,were clarified by the path *** results showed that filtered average annual baseflow significantly decreased(pbaseflow index was *** addition,various significant influencing factors of baseflow had different direct and indirect effects on baseflow at seasonal and annual *** precipitation was the dominant factor with respect to the direct impact,which directs path coefficient was 0.891 in spring,0.823 in summer,1.599 in autumn,1.332 in winter,and 0.917 in an annual scale,*** terms of the indirect effects,evapotranspiration played a leading role during the spring,autumn,winter,and annual scale,whereas the average temperature was the dominant factor during the ***,results demonstrated that the baseflow variation was mainly attributed to climate *** present works are beneficial for revealing the internal mechanism of the baseflow variations in the study area,and it can provide a scientific basis for managing water resources in the watershed.

关键词： baseflow separation baseflow index Climate change Groundwater Pengchongjian watershed

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基于优化基流分割方法的基流时空变化及其驱动因素评估

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Journal of Geographical Sciences 2021年第12期31卷 1873-1894页

作者：孙嘉琪王小军 Shamsuddin SHAHID 李鸿雁 College of Hydrology and Water Resources Hohai UniversityNanjing 210098China State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering Nanjing Hydraulic Research InstituteNanjing 210029China Research Center for Climate Change Ministry of Water ResourcesNanjing 210029China School of Civil Engineering Faculty of EngineeringUniversiti Teknologi Malaysia(UTM)Johor Bahru 81310Malaysia College of New Energy and Environment Jilin UniversityChangchun 130021China Key Laboratory of Groundwater Resources and Environment Ministry of EducationJilin UniversityChangchun 130021China

baseflow is an important component of river or *** plays a vital role in water utilization and *** improved Eckhardt recursive digital filter(IERDF)is proposed in this *** key filter parameter and maximum baseflow index(BFImax)were estimated using the minimum smoothing method to improve baseflow estimation *** generally considered BFImax of 0.80,0.50 and 0.25 according to the drainage basin’s predominant geological characteristics often leads to significant errors in the regions that have complex subsurface and hydrologic *** IERDF improved baseflow estimation accuracy by avoiding arbitrary parameter *** proposed method was applied for baseflow separation in the upstream of Yitong River,a tributary of the Second Songhua River,and its performance was evaluated by comparing the results obtained using isotope-tracer *** performance of IERDF was also compared with nine baseflow separation techniques belonging to filter,BFI and HYSEP *** IERDF was also applied for baseflow separation and calculation of rainfall infiltration recharge coefficient at different locations along the Second Songhua River’s mainstream for the period 2000–*** results showed that the minimum smoothing method significantly improved BFImax estimation *** baseflow process line obtained using IEDRF method was consistent with that obtained using isotope 18 *** IERDF estimated baseflow also showed stability and reliability when applied in the mainstream of the Second Songhua *** BFI alone in the river showed an increase from the upstream to the *** proportion of baseflow to total flow showed a decrease with *** intra-annual variability of BFI was different at different locations of the river due to varying climatic conditions and subsurface *** highest BFI was observed at the middle reaches of the river in summer due to a water surplus from power *** research provided valuab

关键词： Improved Eckhardt recursive digital filtering baseflow separation rainfall infiltration coefficient the Second Songhua River Basin

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