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洪水调查与评价能有效弥补当代遥感技术和传统统计插值技术获取资料的不足。以大沙河“20100821”暴雨为例,利用比降面积法监测水面比降为8‰,计算洪峰流量为1 830m3/s,平均流速2.47 m/s。分析1958年实测多峰洪水过程线,各峰涨落过程线基本平行,平行移动过程线拟化单峰过程线,根据拟化单峰过程线并五点概化,计算洪峰总量为1.09亿m3,径流系数0.84。文章根据本流域实测多峰洪水过程线拟化单峰过程线并五点概化,计算洪量结果合理,附近流域实测数据也证明径流系数大,说明该方法可用,具有推广价值。
Flood investigation and evaluation can effectively make up for the lack of information obtained by contemporary remote sensing techniques and traditional statistical interpolation techniques. Taking Dashahe “20100821” heavy rain as an example, the ratio of surface area to the monitored area is 8 ‰, and the peak flow is calculated to be 1 830m3 / s with an average velocity of 2.47 m / s. Analysis of the 1958 measured multi-peak flood process line, the peak fluctuation process line is basically parallel, parallel to the process of moving the line to be a single process curve, according to the pseudo-single process curve and five o’clock generalization to calculate the total peak of 109 million m3, runoff coefficient of 0.84. Based on the five-point generalization of the simulated unimodal process line of the multi-peak flood process in this drainage basin, the calculation of flood output is reasonable. The measured data in the nearby drainage basin also prove that the runoff coefficient is large, which shows that the method is feasible and has the promotion value.