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针对目前黄河呼和浩特段污染日趋严重,没有合理、完善的水动力模型为流域水环境污染物迁移、扩散和降解模拟提供基础模型的问题,基于MIKE11水动力模块、降雨径流模块构建了黄河呼和浩特段水动力与降雨径流耦合模型,对黄河呼和浩特段降雨径流、水位、流量进行模拟分析,结果表明:降雨径流模型纳什系数E≤0.8的占2.19%,E≤0.9的占7.39%,其余为E>0.9,相对误差σ为0.04%~19.88%,黄河呼和浩特段水动力与降雨径流耦合模拟纳什系数E≥0.99,相对误差σ为0.23%~1.54%;01—06月降雨径流量0.46~8.36m~3/s,10月达到全年最大值,为26.16m~3/s;10月之后呈线性下滑趋势,并到12月初出现急剧下降状态;头道拐、河口镇、喇嘛湾断面02—03月各断面温度开始逐渐回升,且具有一定的突变现象,水位和流量突变范围分别为2.5~3.5 m和1 380~1 400m~3/s,04—12月和1月黄河呼和浩特段水位和流量相对平稳,变化范围分别为1.8~1.3m和790~800m~3/s,并在07—09月出现了一年当中的丰水期,水位和流量最大值可达988.6m和1 162.5m~3/s。
In view of the current pollution in Hohhot section of the Yellow River is becoming more and more serious, there is no reasonable and perfect hydrodynamic model to provide the basic model for the simulation of migration, diffusion and degradation of water environment pollutants in the basin. Based on MIKE11 hydrodynamic module and rainfall-runoff module, The results show that the rainfall runoff model Nash coefficient E≤0.8 accounted for 2.19%, E≤0.9 accounted for 7.39%, and the rest was E> 0.9 , The relative error σ is 0.04% ~ 19.88%, and the coupled Nash coefficient E≥0.99 and the relative error σ are 0.23% ~ 1.54% for the coupled hydrodynamic and rainfall runoff in the Hohhot section of the Yellow River. The monthly rainfall runoff is 0.46 ~ 8.36m ~ 3 / s in October, reaching the annual maximum value of 26.16m ~ 3 / s; the trend of linear decline after October showed a sharp decline in early December; the headway Shui Po, Hekou town and Lamawan section were between February and March The temperature of each section began to gradually rise with some abrupt changes. The range of water level and flow rate changed from 2.5 to 3.5 m and from 1 380 to 1 400 m 3 / s, respectively. The water level and flow rate in Hohhot section of the Yellow River from April to December and January were relatively Smooth, changeable Ranges of 1.8 ~ 1.3m and 790 ~ 800m ~ 3 / s, and 07-- appeared wet period of the year in September, the maximum water level and flow rate of up to 988.6m and 1 162.5m ~ 3 / s.