College of Geography and Environment, Shandong Normal University, Jinan, 250358, China.
Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity, College of Urban and Environmental Sciences, Northwest University, Xi'an 710127, China; State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau, Institute of Soil and Water Conservation, Chinese Academy of Sciences, Yangling, 712100, China.
J Environ Manage. 2019 Mar 1;233:264-270. doi: 10.1016/j.jenvman.2018.12.040. Epub 2018 Dec 21.
Baseflow is the portion of streamflow that originates from groundwater. It is pivotal to groundwater supply as well as the interactions between groundwater and surface water. In the Loess Plateau of China, the baseflow plays a fundamental role in sustaining the aquatic ecosystem. Rational estimation of baseflow is of critical importance for understanding the functioning of the groundwater system and informing management of regional water resources. In this study, a two-well parameterised digital filter was used to separate baseflow from observed daily total streamflow on the Weihe River Basin. Two parameters (maximum baseflow index (BFI) and the recession constant) of this filter were estimated using UKIH and a recession analysis with physical meaning, respectively. The results show that the baseflow index increased from the upstream to downstream (0.27-0.32) of the Weihe River, and the baseflow of the river is summer dominant. In general, the baseflow has been increasing gradually owing to the implementation of soil conservation measures. This study provides an understanding of baseflow response to seasonal variability and water environmental management in basin scale.
基流是源自地下水的部分河流流量。它对地下水供应以及地下水与地表水之间的相互作用至关重要。在中国的黄土高原，基流对维持水生态系统起着基础性作用。合理估算基流对于了解地下水系统的功能以及区域水资源管理具有重要意义。本研究采用双井参数化数字滤波器，将基流从渭河流域的日总流量中分离出来。该滤波器的两个参数（最大基流指数（BFI）和衰退常数）分别采用 UKIH 和具有物理意义的衰退分析进行估算。结果表明，基流指数从渭河流域的上游到下游（0.27-0.32）逐渐增加，河流的基流以夏季为主。总体而言，由于实施了水土保持措施，基流逐渐增加。本研究提供了对流域尺度基流对季节性变化和水环境管理响应的理解。
