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Mathematical Problems in Engineering
Volume 2017 (2017), Article ID 8785236, 15 pages
https://doi.org/10.1155/2017/8785236
Research Article

Runoff and Sediment Response to Cascade Hydropower Exploitation in the Middle and Lower Han River, China

1College of Resources and Environmental Science, South-Central University for Nationalities, Wuhan 430074, China
2State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, China
3Changjiang Water Resources Protection Institute, Wuhan 430010, China
4State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan 430072, China
5China Institute of Water Resources and Hydropower Research, Beijing 100038, China
6College of Hydropower & Information Engineering, Huazhong University of Science & Technology, Wuhan 430074, China
7Changjiang River Scientific Research Institute, Wuhan 430010, China

Correspondence should be addressed to Junhong Zhang; nc.ude.ceucs.liam@9504102 and Lu Chen; moc.621@5058lhc

Received 19 August 2016; Revised 20 December 2016; Accepted 4 January 2017; Published 14 February 2017

Academic Editor: Maurizio Brocchini

Copyright © 2017 Junhong Zhang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

With the rapid development of hydropower exploitation in China, changes in runoff and sediment transport have become a significant issue that cannot be neglected. In this study, the Han River was selected as a study case, where the runoff variation and changes in sediment load at the Baihe, Huangjiagang, Huangzhuang, and Xiantao stations were analyzed in different time periods. The results indicate that impact of cascade hydropower exploitation on runoff and sediment transport is significantly different even during the same time periods. After reservoir regulation, the decreasing of sediment load is faster than that of runoff. Strong positive correlation between runoff and sediment load exists during different time periods, while reservoir operation leads to different turning points at the Baihe, Huangjiagang, Huangzhuang, and Xiantao stations in the middle and lower Han River. As a key driving factor, runoff variation contributed to sediment transport with different impact index . The impact index before and after the first change point at the Baihe, Huangjiagang, Huangzhuang, and Xiantao stations is 43.35%, −3.68%, 11.17%, and 30.12%, respectively. This study helps us understand and evaluate the hydrological changes under cascade hydropower exploitation in the middle and lower Han River.