丹江口~王甫洲冲淤河道糙率变化趋势

Variation Trend of Scour and Silt Channel Roughness from Danjiangkou to Wangfuzhou

为分析丹江口~王甫洲水利枢纽河段糙率随河道冲刷变化规律,采用实测洪水位推求王家营~黄家港、黄家港~老河口河段1954~2019年河段糙率,按照5个不同流量级分析河段糙率变化趋势。结果表明:王家营~黄家港河段糙率整体大于黄家港~老河口河段糙率,随着流量的增大河段糙率差异逐步减小;从1954~2019年,河段糙率在不同量级流量下均呈现增大趋势;王家营~黄家港河段糙率在1000~2000 m3/s、5000~10,000 m3/s、20,000 m3/s以上量级下基本达到稳定状态;黄家港~老河口河段糙率在20,000 m3/s以上流量下基本达到稳定状态,其它量级下仍处于波动状态。

The paper is proposed to analyze the roughness variation law with river scour in the reach of Danjiangkou-Wangfuzhou water conservancy project. The roughness of Wangjiaying-Huangjiagang and Huangjiagang-Laohekou river reaches from 1954 to 2019 was calculated by using the measured flood levels. The variation trend of roughness was analyzed according to five different flow levels. The results show that: the roughness of Wangjiaying-Huangjiagang reach is larger than that of Huangjiagang-Laohekou reach, and the difference of roughness decreases gradually with the increase of discharge;the roughness of the reach showed an increasing trend under different magnitudes of discharge from 1954 to 2019;the roughness of Wangjiaying-Huangjiagang basically reaches a stable state at the orders of 1000~2000 m3/s, 5000~10,000 m3/s and 20,000 m3/s, the roughness of Huangjiagang-Laohekou basically reaches a stable state when the flow rate is above 20,000 m3/s, but still fluctuates at other orders of magnitude.