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Dam construction impacts on multiscale characterization of sediment discharge in two typical karst watersheds of southwest China
Journal of Hydrology ( IF 6.4 ) Pub Date : 2018-03-01 , DOI: 10.1016/j.jhydrol.2018.01.034 Zhenwei Li , Xianli Xu , Chaohao Xu , Meixian Liu , Kelin Wang
Journal of Hydrology ( IF 6.4 ) Pub Date : 2018-03-01 , DOI: 10.1016/j.jhydrol.2018.01.034 Zhenwei Li , Xianli Xu , Chaohao Xu , Meixian Liu , Kelin Wang
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Abstract Southwest China, as one of the largest continuous karst areas in the world, is a severely eroded region due to its special geological condition. Thus, soil and water conservation measures such as dam construction have been extensively implemented in this region to control sediment delivery. However, it remains unclear how dam construction affects multiscale variability of sediment discharge (SD) and its potentially influential factors in southwest China. To assess this, annual SD, water discharge (WD), precipitation (PT), potential evapotranspiration (PET), and normalized differential vegetation index (NDVI) data from 1955 to 2015 were obtained from two karst watersheds of Liujiang (no large dams) and Hongshui (dam-controlled). These sites shared the similar climatic conditions. The Mann-Kendal test, Wilcoxon rank-sum test, and continuous wavelet transform analysis was used to detect the trends and periodicity in SD, and wavelet coherence analysis were employed to detect the temporal covariance between SD and WD, PT, PET, and NDVI. Results indicated that the multiscale variability of SD was strongly influenced by dam construction. The annual SD showed significant 4-year periodic oscillation in the Liujiang watershed, while no significant cycles were found in the Hongshui watershed. Dam construction exerted substantial influence on the multiscale correlations between SD and its associated factors. The time scales that the NDVI resonated with SD were concentrated on the periodicity of 2- and 3-year in the Liujiang watershed. In contrast, no significant periodicities were observed in the Hongshu watershed. This study yields a greater understanding of SD dynamics, and is helpful for better watershed management in karst areas of southwest China.
更新日期：2018-03-01
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