您好，欢迎访问江西省农业科学院 机构知识库！

Combined effects of rainfall types and antecedent soil moisture on runoff generation at a hillslope of red soil region

文献类型： 外文期刊

作者： Wang, Yaji 1 ; Gao, Lei 1 ; Huang, Shangshu 3 ; Peng, Xinhua 1 ;

作者机构： 1.Chinese Acad Sci, State Key Lab Soil & Sustainable Agr, Inst Soil Sci, Nanjing 210008, Peoples R China

2.Univ Chinese Acad Sci, Beijing, Peoples R China

3.Jiangxi Inst Red Soil, Nanchang, Jiangxi, Peoples R China

4.Jiangxi Agr Univ, Coll Land Resources & Environm, Nanchang, Jiangxi, Peoples R China

关键词： hillslope hydrology; rainfall classification; red soil; runoff modelling; runoff threshold

期刊名称：EUROPEAN JOURNAL OF SOIL SCIENCE （ 影响因子：4.178； 五年影响因子：4.883 ）

ISSN： 1351-0754

年卷期： 2022 年 73 卷 4 期

页码：

收录情况： SCI

摘要： The runoff threshold is one of the important parameters in hillslope hydrology. Information on the combined roles of rainfall types and antecedent soil moisture in the runoff generation threshold is still scarce. Therefore, we linked the runoff generation behaviours of a 150-m hillslope with rainfall types and antecedent soil moisture conditions during a 4-year observation period between January 2017 and December 2020 in the red soil region of China. We found that the surface runoff of a hillslope could be modelled with a relatively high accuracy using HYDRUS 1D. Rainfall event types, classified into four types (I, II, III and IV) using a machine learning based k-means clustering algorithm, significantly affected the modelling accuracy of runoff. The prediction accuracy decreased as the level of rainfall type increased, with R2 decreasing from 0.93 for type I to 0.41 for type IV and RMSE increasing from 0.0082 to 0.025 cm3cm-3 accordingly. The scope of the runoff threshold, represented by antecedent soil water storage of 0-30 cm and event rainfall amount (ASW+P), ranged between 97 and 139 mm. That is, when ASW+P was lower than the lower limit, no runoff occurred in all of the rainfall events, and runoff would be generated without considering the hydrological conditions if ASW+P was higher than 139 mm. The driving factors of runoff generation were strongly dependent on the classified rainfall types. Hourly maximum rainfall intensity was the main contributor to runoff generation for the relatively slight rainfall events (i.e., types I and II). The rainfall amount, however, played a dominant role for the rainfall types with larger amounts and intensities (i.e., types III and IV). These findings provide insights into the method of determining runoff thresholds as well as the inner mechanisms of runoff generation behaviours at the hillslope scale under regions with similar climatic and hydrological conditions to the present study. Highlights Heavy rainfall events were the main error sources of runoff modelling. The threshold of runoff generation was identified by the combination of antecedent soil moisture and rainfall. Threshold scope of runoff generation ranged between 97 and 139 mm. Rainfall classification is valuable in understanding runoff generation behaviours. Runoff driving factors depended on rainfall types.

  • 相关文献
作者其他论文 更多>>
置顶
购物车
反馈

© 京ICP备09089781号-29 主办单位：江西省农业科学院

学术资源： 中国农业科学院 农业专业知识服务系统 农科联盟资源共建共享平台 中国农业科技文献与信息服务平台 中国农业期刊集成服务平台