|Table of Contents|

Runoff-sediment Yield Relationship and Variation Characteristics in Wuding River Basin, a Branch of the Middle Yellow River, China(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2019年第02期
Page:
241-252
Research Field:
水资源与环境
Publishing date:

Info

Title:
Runoff-sediment Yield Relationship and Variation Characteristics in Wuding River Basin, a Branch of the Middle Yellow River, China
Author(s):
ZHANG Hong-bo1; 2;  LI Jiao-jiao1;  XIN Chen3;  LI Ji-cheng1
(1. School of Environmental Science and Engineering, Chang’an University, Xi’an 710054, Shaanxi, China; 2. Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of Ministry of Education, Chang’an University, Xi’an 710054, Shaanxi, China; 3. Administration of Rivers and Reservoirs in Shaanxi Province, Xi’an 710018, Shaanxi, China)
Keywords:
hydrological variation;  sediment discharge;  empirical mode decomposition;  STARS method;  ICSS method;  runoff-sediment yield relationship;  attribution analysis;  Wuding river basin
PACS:
P333
DOI:
-
Abstract:
In recent years, the runoff-sediment yield relationship in Wuding river basin, a branch of the middle Yellow River, changes dramatically, and the runoff and sediment discharge decrease sharply. There is no effective solution to propose for dealing with the overlap problem of the variation types of the annual runoff and sediment discharge sequences(especially the trend variation, the mean jumping variation and the variance variation), so that it is difficult to give an accurate attribution to the variations. Therefore, the observed annual runoff and sediment discharge sequences at 10 hydrological stations in Wuding river basin were taken as the research objects, by using empirical mode decomposition, STARS method and iterated cumulative sums of squares(ICSS)method; and the trend variation, the mean jumping variation and the variance variation of the observed annual sediment discharge sequences were tested, and the variation types of the annual sediment discharge sequence in Wuding river basin were identified. At the same time, the change of runoff-sediment yield relationship in Wuding river basin was explored by using the double cumulative curves, and the causes of the typical variation were analyzed by combining with the actual situation of the basin. The results show that the variation types of the annual sediment discharge sequence in Wuding river basin all belong to the compound types, which present the characteristics of complexity and changeability, therein, the trend variation mainly manifests as descending and thenrising, the mean jumping variation shows the upward-downward change and sinking, and the variance variation is mainly the amplitude reduction; according to the results of attribution analysis, the warping dam construction in Wuding river basin drives the sinking mean jumping variation of the annual sediment discharge sequence, and leads to the trend variation and the variance variation of the sequence together with other water and soil conservation measures; the changes in precipitation and dust storm frequency have only a weak impact on the trend variation; the upward mean jumping variation detected in the compound types should be caused by the water and soil loss due to the heavy precipitation during the construction of the warping dam, and by river scour due to clear water discharge(including little sediment)after the dam; it should be noted that the decay of the storage capacity of the warping dam group for sediment deposition with time also contributes the trend variation of the annual sediment discharge sequence.

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Last Update: 2019-02-28