Author(s): Chunjing Zhao; Xiangbing Kong; Kai Guo; Yinan Wang; Peng Jiao; Jintao Zhao

Linked Author(s):

Keywords: Fen River; Precipitation; Sediment reduction; Soil and water conservation measures

Abstract: The study of the characteristics of rainfall periods with wet-normal-dry and the contribution of soil and water conservation measures to sediment reduction at different stages in a long-term sequence is of great significance for coping with extreme environmental changes and rational allocation of soil and water conservation measures. The small basins of Jian and Tunlanchuan, the primary tributaries of the Fen River Basin, were selected as the typical basins. The precipitation data from 1962 to 2014 were normalized and smoothed. Results suggest that: the precipitation in typical basin showed a fluctuating trend of decreasing first and then increasing; The sediment reduction of terrace and forest in different stages showed: wet year> normal year> dry year, while sediment reduction in grassland is wet year> dry year> normal year; The proportion of sediment reduction of forest, terrace and grassland in Jianhe Basin in wet, normal and dry years is: 1:3. 1:0. 5,1: 2.5: 0.4, 1:2. 5:0. 4, and the proportion in Tunlanchuan Basin is 1:6: 0.2, 1:4. 9:0. 2,1: 4.9: 0.2, respectively. In the same wet, normal and dry years, the measures of sediment reduction from large to small are: forest, terrace, grassland. forest measures play an important role in sediment reduction, accounting for more than 80 % of the total sediment reduction of soil and water conservation measures on the slope.

DOI: https://doi.org/10.3850/iahr-hic2483430201-221

Year: 2024