基于数值模拟的山区河道治理方案应用研究

Application Study of Mountainous River Management Scheme Based on Numerical Simulation

以黄河流域艾山河道为研究对象,研究山区河道治理方案应用。并基于数值模拟,研究去生产堤方案和双防线方案下艾山的治理情况,分析在10年和百年一遇型洪水下,艾山河道的泥沙去留和防护情况。结果表明,10年一遇型洪水来流小于防护标准,而百年一遇型洪水来流大于防护标准。10年一遇型洪水流量随时间呈先增大后减小,而百年一遇型洪水的去生产堤方案的洪峰流量稳定在6 000~9 000 m^(3)/s之间,而双防线方案洪峰流量则随时间呈先减小后增大,之后趋于稳定。同方案下,不同级别洪水主槽冲刷量与入口流量大小呈正比。其中,双防线方案出口泥沙量大于去生产堤方案的出口泥沙量,能有效提升河段输沙能力。分洪过程与退洪过程相关,可分为4个阶段,且双防线方案的平均淹没水深总体小于去生产堤方案平均淹没水深。

In this paper, we study the application of mountainous river management scheme in the Aishan river channel in the Yellow river basin, and analyze the sediment retention and protection of the Aishan river channel under the 10-year and 100-year floods based on numerical simulations of the de-production dike scheme and the double protection line scheme. The results show that the incoming flow of the 10-year flood is smaller than the protection standard, while the incoming flow of the 100-year flood is larger than the protection standard. The flow of the 10-year flood increases with time and then decreases, while the peak flow of the 100-year flood is stable between 6 000~9 000 m^(3)/s for the de-production dike scenario, while the peak flow of the double line of protection scenario decreases with time and then increases and then stabilizes.The scour of the main channel for different levels of flooding under the same scenario is proportional to the magnitude of the inlet flow. The outlet sediment volume of the double line of protection scheme is larger than that of the de-production dike scheme, which can effectively improve the sand transport capacity of the river section. The flood separation process is related to the flood recession process, which can be divided into four stage phases, and the average inundation depth of the double line of defense scheme is generally smaller than the average inundation depth of the de-production dike scheme.