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Determination of erosive events in the Chinese Loess Plateau using the runoff threshold
Zheng, Mingguo1; Cheng, Weiming2
2017-04-01
Source PublicationJOURNAL OF SOILS AND SEDIMENTS
ISSN1439-0108
Volume17Issue:4Pages:1182-1190
Corresponding AuthorZheng, Mingguo(zhengmg.04b@igsnrr.ac.cn)
AbstractExclusion of non-erosive rainfalls is highly desirable in calculating the rainfall erosivity. It is common practice to use a rainfall threshold to separate erosive from non-erosive events. This study aims to determine erosive events in the Chinese Loess Plateau using the runoff threshold. The data used mainly include h (runoff depth; total runoff volume normalized to drainage area) and specific sediment yield (SSY) of 1475 storm events observed at three scales of hillslope, subwatershed, and watershed. The linear h-SSY relationships (SSY = bh + a) were established. The x-intercept term (-a/b) was interpreted to be the h threshold between erosive and non-erosive events. The t test was used to test whether the constant term a is statistically zero or not. The t tests demonstrated that the h-SSY relationship was proportional on upland slopes, but linear with a positive x-intercept in subwatersheds and watersheds. Accordingly, the h threshold of erosive events varied from zero on upland slopes, implying that any runoff event is erosive, to a positive value in subwatersheds and watersheds. The positive h threshold can be related to the preferential generation of runoff on the bedrock channel at the subwatershed scale and to the base flow at the watershed scale. Using the h threshold can remove approximately 85% of rainfall events from the calculation of rainfall erosivity. The h threshold not only is equally effective as the rainfall threshold in removing non-erosive events but also allows a more accurate estimation of rainfall erosivity.
KeywordErosion Loess Plateau Rainfall erosivity Threshold of erosive rainfalls
DOI10.1007/s11368-016-1598-8
WOS KeywordFLOW-SEDIMENT RELATIONSHIP ; HILLY AREAS ; WATERSHEDS ; SCALES ; YIELD
Indexed BySCI
Language英语
Funding ProjectNational Mountain Flood Disaster Investigation Project[SHZH-IWHR-57] ; National Natural Science Foundation of China[41230746] ; National Natural Science Foundation of China[41271306]
Funding OrganizationNational Mountain Flood Disaster Investigation Project ; National Natural Science Foundation of China
WOS Research AreaEnvironmental Sciences & Ecology ; Agriculture
WOS SubjectEnvironmental Sciences ; Soil Science
WOS IDWOS:000398780500026
PublisherSPRINGER HEIDELBERG
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/64582
Collection中国科学院地理科学与资源研究所
Corresponding AuthorZheng, Mingguo
Affiliation1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Water Cycle & Related Land Surface Proc, Beijing 100101, Peoples R China
2.Chinese Acad Sci, Inst Geog Sci & Nat Resources, State Key Lab Resources & Environm Informat Syst, Beijing 100101, Peoples R China
Recommended Citation
GB/T 7714
Zheng, Mingguo,Cheng, Weiming. Determination of erosive events in the Chinese Loess Plateau using the runoff threshold[J]. JOURNAL OF SOILS AND SEDIMENTS,2017,17(4):1182-1190.
APA Zheng, Mingguo,&Cheng, Weiming.(2017).Determination of erosive events in the Chinese Loess Plateau using the runoff threshold.JOURNAL OF SOILS AND SEDIMENTS,17(4),1182-1190.
MLA Zheng, Mingguo,et al."Determination of erosive events in the Chinese Loess Plateau using the runoff threshold".JOURNAL OF SOILS AND SEDIMENTS 17.4(2017):1182-1190.
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