Examining flow regime alteration and its potential impacts on freshwater ecosystem under effects of climate change and human activities
Climate change and human activities have not only changed the amount of streamflow but also the detailed flow regimes, which are critical determinants of ecological integrity in river ecosystem. In this paper, the climate-induced and human-induced alterations of flow regime were examined by analogy method, and Shahe River of Baiyangdian Basin as an example in semiarid North China Plain was investigated. Firstly, abrupt changes of upstream flow and downstream flow were detected by Pettitt test and precipitation-runoff double cumulative curve method. Then, alteration of flow regimes at daily scale was assessed according to indicators of hydrological alteration (IHA). Finally, the contribution of climate change and human activities was distinguished by comparing alteration extent at different stations during different periods. Results showed that: (i) annual streamflow in upstream and downstream stations can be divided into baseline period (1959-1979) and post-baseline period (1980-2005); (ii) human activities had larger effects on flows in pre-flood season, extreme flow date, frequency, duration and flow change rate; (iii) meanwhile, flows in flood and post-flood seasons, magnitude of extreme events were sensitive to climate change. This study indicated that it is important to take different impact factors into account when assessing flow regime alteration. Quantitatively evaluating the effects of climate change and human activities on flow regime components is greatly beneficial to ecosystem-based water resource management and restoration of freshwater ecosystems.
Flow regime alteration climate change human activities analogy method
Y.Yang X.A.Yin Q.Liu Z.F.Yang
State Key Laboratory of Water Environmental Simulation, School of Environment, Beijing Normal University. No 19 Xinjiekouwai Street, Beijing, China, 100875
国际会议
The 3rd Biennial ISRS Symposium Achieving Healthy and Viable Rivers (ISRS)第3届国际河流大会
北京
英文
209-220
2013-08-05（万方平台首次上网日期，不代表论文的发表时间）