RESOURCES AND ENVIRONMENT IN THE YANGTZE BASIN >> 2015, Vol. 24 >> Issue (09): 1606-1612.doi: 10.11870/cjlyzyyhj201509023

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Effect of the basin rainfall erosivity change on the riverine sediment load in the upper yangtze

HUANG Xiao-yan1, WEI Jie1,2   

  1. 1. Geography & Tourism College, Chongqing Normal University, Chongqing 401331, China;
    2. Chongqing Key Laboratory of Surface Process and Environment Remote Sensing in the Three Gorges Reservoir Area, Chongqing 401331, China
  • Received:2014-11-09 Revised:2015-03-06 Online:2015-09-20
  • Contact: 韦杰,E-mail:wei_jie@mails.ucas.ac.cn E-mail:wei_jie@mails.ucas.ac.cn

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Abstract: Rainfall erosivity is one of the most important factors influencing riverine sediment load. However, riverine sediment load in response to rainfall erosivity change is not well understood in the upper Yangtze Basin. Based on the annual sediment load and daily rainfall data from 1956 to 2010 in the upper Yangtze Basin, we presented a quantitative estimate of changes in riverine sediment load in response to basin rainfall erosivity in the study area. The turning point of each subbasin was determined using double-mass curve and the critical years for subbasins of Jinsha, Min, Jialing, Wu and the upper Yangtze are 1999, 1993, 1985, 1984, and 1991 respectively. The effects of the basin rainfall erosivity change on the riverine sediment load were studied using linear regression analysis, and the contribution rates were estimated subbasin by subbasin. The result indicated that annual rainfall erosivity was relatively lower in the upper Yangtze Basin, with a value of 3 006 MJ·mm/(hm2·h·a), and there were great differences between the subbasins, the maximum of 5 055 MJ·mm/(hm2·h·a) appeared in the Wu subbasin, and the minimum of 1 560 MJ·mm/(hm2·h·a) in the Jinsha subbasin was less than one third of that in the Wu subbasin. The extremes ratios were sequenced as Jialing subbasin, Min subbasin, Wu subbasin, Jinsha subbasin. The annual sediment load was trending downward from 1956 to 2010 both in the upper Yangtze Basin and the subbasins, especially in the upper Yangtze Basin and Jialing subbasin where proved to has decreased dramatically. The upper Yangtze basin had an annual sediment load of 428 million tons, while subbasins of Jinsha, Min, Jialing and Wu varied in annual sediment load of 239 million t, 45 million t, 104 million t and 24 million t respectively. The contribution rate of rainfall erosivity on the sediment load variation in the upper Yangtze basin was 7%, and 36%, 20%, 9% for Min, Jialing, and Wu subbasins, respectively. But the increased rainfall erosivity of Jinsha subbasin did not decrease sediment load, therefore, it can be concluded that the decrease of sediment load of Jinsha subbasin was not mainly caused by rainfall. Generally speaking, rainfall has less influence on the sediment load change in the upper Yangtze than that of human activities.

Key words: sediment load, rainfall erosivity, double-mass curve, subbasin, the upper Yangtze

CLC Number: 

  • S157.1
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