Author(s): Jianguo Chen; Anjun Deng; Chonghao Wang; Cuixia Chen
Linked Author(s): Jianguo Chen, Chonghao Wang
Keywords: Impacts; Man-made flood peaks; Efficiency of channel erosion; The Xiaolangdi Reservoir
Abstract: The water stored above the flood control level of the reservoir was regulated and released from the Xiaolangdi Reservoir as a man-made flood peak to enhance the erosion of the Lower Yellow River. Based on the field data of the Xiaolangdi Reservoir and the Lower Yellow River from 2002 to 2015, this paper analyzes impacts of man-made flood peaks of the Xiaolangdi Reservoir. The result shows that from 2002 to 2015, the nineteen man-made flood peaks were carried out, the total water for these peaks amounted to 1.24×109m3~6.04×109m3 and the total sediment load were 0~0.08×109t. The amount of erosion was increased with the increasing of incoming water of flood, the amount of erosion and the efficiency of channel erosion was gradually declined from 2006. The erosion appeared along the whole river, the total erosion for the nineteen man-made flood peaks amounted to 0.427×109t, 1 m3 of incoming water could erode averagely about 6 kg of bed sediment. Moreover, all the erosion happened in the main channel, which was beneficial to the enlargement and comparatively narrower of cross-sections, dropping the water level and increases of flood conveying and sediment transporting capacities. The incoming runoff for the nineteen man-made flood peaks accounted for 19.1% of the total runoff in 2002-2015, the erosion was 17.5% of the total correspondingly. All of these imply that the man-made flood peak resulted from the utilization of abandoned water of the reservoir is much affective to strengthen the channel erosion although it is just a part of the total erosion.
Year: 2024