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采用SOBEK软件平台构建平原河网模型,模拟不同情景下河网结构变化对河网削减洪峰能力的影响,尝试找到能够有效调控洪峰的河面率范围和河网结构参数。研究表明,在不改变河面率的情境下,支流的交汇角度小,交汇点在干流上游时河网削减洪峰能力相对较大;在提高河面率的情境下:随河流弯曲度增大调蓄能力增大,当弯曲度为2.8时河流单位面积削减洪峰的能力达到峰值;随河面率增大河网削减洪峰能力增强,但单位河面积削峰效率存在峰值,模拟得出河面率为3%～5%时,单位河面积增量的削峰效率最强;增加支流面积比增大干流面积能更有效地改善河网的调蓄功能。
This paper uses the SOBEK software platform to construct a plain river network model and simulates the influence of river network structure changes on the reduction of flood peak capacity under different scenarios. Attempts to find the river range rate and river network structure parameters that can effectively control the flood peak are sought. The research shows that the tributary intersection angle is small without changing the river surface rate, and the flood control ability of the river network is relatively large when the intersection point is in the upper reaches of the mainstream. In the situation of increasing the river surface rate, the storage capacity increases with the river curvature increasing With the curvature of 2.8, the peak per unit area of river can reduce the flood peak. With the increase of river area, the river network has the ability of reducing the flood peak, but there is a peak in the peak area efficiency per unit area. The simulation shows that the river surface rate is 3% -5 %, The peak area efficiency of unit river area is the strongest. The increase of tributary area ratio and the increase of main stream area can improve the regulation and storage function of river network more effectively.