基于情景模拟的承德避暑山庄水系集雨能力和汇水效果

Rainwater Harvesting Capacity and Water Conservancy Effect of Chengde Mountain Resort Based on Scenario Simulations

文章针对山庄内的冲沟、水体,利用SWMM软件建立开发前(热河上营时期)、后(避暑山庄时期)两个情景的水文模型,在不同降雨量的条件下,对雨水径流的汇流过程和排放过程进行情景模拟,对比分析两种模型的径流总量、峰值流量及峰现时间;针对山庄内的景观湖体,利用HEC-Ras软件建立二维非恒定流模型,分析不同降雨量下景观水体的汇水效果。结果表明,避暑山庄水体系统对径流总量、峰值流量、峰现时间具有消减、延迟作用,能够形成具有一定效果的季节性水体,并依靠武烈河形成了稳定的补水排水体系,提升了水系的水安全能力和水景观稳定性。

This paper establishes the hydrological models for the two scenarios before the development( the period of the Rehe Shangying) and after the development( the period of the mountain resort) using the SWMM software,respectively for drained valley and water bodies in Chengde Mountain Resort. Under the context of different rainfalls,the confluence process and the discharge process of the storm water runoff are simulated. The total runoff,peak flow and peak time in the two models are compared and analyzed. For the landscape lake in the resort,the two-dimensional unsteady flow model is established using HEC-Ras software to analyze the water conservancy effect of the landscape water bodies under different rainfall changes. The results show that the water system in Chengde Mountain Resort has obvious reduction and delay effects on the total runoff,peak flow and peak time,and could form seasonal water bodies of certain effect;and the mountain resort relies on Wulie River to form a stable water replenishment and drainage system,which improves the water security capacity and water landscape stability of the mountain resort.