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- W2348647353 abstract "Due to the difference in physico-geographic settings,the decoupling of water and sediment sources in the upper Yellow River basin is marked,namely,the main source area of runoff does not coincide with the main source area of sediment. This has a profound influence on channel sedimentation processes in the Lanzhou – Toudaoguai reach. The purpose of this paper is to establish the quantitative relationship between the channel sedimentation( SL-T) and different water and sediment source areas,whereby providing some reference to the decision-making for sedimentation reduction. Three water and sediment source areas have been identified,the clear water area below Lanzhou( Area 1),the fine sediment source area of the Zulihe and Qingshuihe Rivers( Area 2),and the coarse sediment source area of the10 kongdui( Area 3). The water-sediment coupling indices between the three areas have been proposed,which can be used to reflect the dilution effect of the clear water from Area 1 on the sediments from Area 2 and Area 3. A multiple regression equation has been established that relates the annual SL-Twith suspended sediment load and runoff from different source areas. According to the semi-partial correlation coefficients of the influencing variables,the contributions of the high-flow season runoff( Qwh,L) from Area 1 and the annual sediment quantities from Area 1( Qs,L),Area2( Qs,ZQ) and Area 3( Qs,KD) to the variation in the channel sedimentation have been estimated as 39.6%,23. 8%,14. 0% and 22. 6%,respectively. The contribution from Qwh,Lranks the first,the contribution from Qs,KDis larger than that from Qsh,ZQ,and the sum of the contributions fromQs,ZQand Qs,KDis 1. 41 times as large as the contribution from Qs,L.The relationships between SL-Tand the water-sediment coupling indices have been established,based on which the threshold for no fill,no scour state of the channel has been estimated,which may be used for the SL-Tadjustment through the reservoir regulations. According to the results,some countermeasures for sedimentation reduction have been suggested." @default.
- W2348647353 created "2016-06-24" @default.
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- W2348647353 date "2014-01-01" @default.
- W2348647353 modified "2023-09-27" @default.
- W2348647353 title "Channel sedimentation in the Lanzhou- Toudaoguai reach of the upper Yellow River influenced by runoff and sediment from different source areas" @default.
- W2348647353 hasPublicationYear "2014" @default.
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