KANG Jingling,DING Wenfeng,HAN Haoyu,et al.Relationship Between Runoff and Sediment on Differernt Time Scales in Chabagou Watershed[J].Research of Soil and Water Conservation,2021,28(05):81-87.
不同时间尺度岔巴沟流域水沙关系变化
- Title:
- Relationship Between Runoff and Sediment on Differernt Time Scales in Chabagou Watershed
- 文章编号:
- 1005-3409(2021)05-0081-07
- Keywords:
- runoff and sediment relationship; time scale; flood event; sediment discharge; Chabagou watershed
- 分类号:
- P333
- 文献标志码:
- A
- 摘要:
- 为探明岔巴沟流域不同时间尺度下水沙关系变化及影响因素,根据岔巴沟流域1970—2016年的年降雨量、径流量和输沙量数据,以及106场次洪水事件的降雨、径流和输沙数据,采用Mann-Kendall检验法对年尺度水沙数据的变化趋势和突变点进行了分析,并通过函数模型回归方法研究年时间尺度以及次洪水时间尺度下的水沙关系。结果表明:流域降雨量显著增加,径流量和输沙量显著下降,分别于1986年、1991年、2001年以及1982年发生突变; 将研究时期划分为3个阶段,发现次洪水尺度下降雨量和输沙量的变化趋势与年尺度下一致,径流量的变化趋势则相反; 输沙量在两种时间尺度下均与洪峰流量和径流深呈显著的幂函数关系; 岔巴沟流域水沙关系和影响因素变得复杂,主要与淤地坝和植被恢复等措施产生的水土保持效益以及极端降雨事件频率和强度增加等因素有关。
- Abstract:
- To further reveal the changes of relationship between runoff and sediment and its influencing factors on different time scales in Chabagou watershed,based on the data of annual precipitation,runoff and sediment discharge,rainfall,runoff and sediment discharges in 106 times floods events from 1970 to 2016,the change trend and abrupt change points of runoff and sediment discharge on inter-annual scale,runoff-sediment relationships on inter-annual scale and on flood event scale were analyzed by using the non-parameter Mann-Kendall test method and functional model regression method. The results showed that annual precipitation in Chabagou watershed increased significantly,while runoff and sediment discharge had decreased significantly from 1970 to 2016,and the abrupt change points were detected in 1986,1991 and 2001,and 1982,respectively. The change trends of precipitation and sediment discharge on flood event scale were consistent with the change trends of precipitation and sediment discharge on inter-annual scale,while the change trend of runoff on flood event scale was opposite with inter-annual scale. The study period was divided into three different research periods: 1970—1981,1982—2000 and 2001—2016 according to the abrupt changing points. The relationships of both the flood peak discharge and runoff depth with sediment discharge on two time scales were significantly described by power function. The runoff and sediment relationship and its influencing factors were complexed in Chabagou watershed,which was mainly related to the benefits of soil and water conservation measures such as check dams and vegetation restoration,and the increase of frequency and intensity of extreme rainfall.
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备注/Memo
收稿日期:2020-10-24 修回日期:2020-11-16资助项目:国家重点研发计划项目(2019YFC1510705,2017YFC1502500); 长江科学院中央级公益性科研院所基本科研业务费(CKSF2019185/TB)第一作者:康靖羚(1996—),女,山西忻州人,硕士研究生,主要从事水土保持及流域侵蚀产沙与调控方面研究。E-mail:411453449@qq.com通信作者:丁文峰(1975—),男,河南汝州人,教授级高工,主要从事土壤侵蚀与水土保持、土地资源与环境方面的研究。E-mail:dingwf@mail.crsri.cn