【作者】 尹海龙； 赵志超； 徐祖信；

【Author】 YIN Hai-long;ZHAO Zhi-chao;XU Zu-xin;State Key Laboratory of Pollution Control and Resource Reuse,Tongji University;

【机构】 同济大学污染控制与资源化研究国家重点实验室；

【摘要】 城市汇水区划分在城市雨水管理决策支持过程中至关重要。然而,城市空间发展和地形变化的动态性特点使得利用数字高程模型(DEM)划分的城市汇水区具有滞后性。本研究提出了一种反问题模型的城市汇水区划分方法,将监测得到的汇水区排水泵站时间序列的排水流量作为水量平衡模型的已知参数,将不同汇水区的面积作为未知参数。建立汇水区监测排水量和模拟排水量的限制性最小化目标函数,通过求解非线性多元函数得到最优化解。上海市中心城区部分汇水区划分表明,DEM与反问题模型划分汇水区的差异性在汇水区内管网系统的完整性评估和低影响开发的有效性评价中具有重要作用。更多还原

【Abstract】 Delineation of urban catchment is an important parameter for the decision support of urban stormwater management.However,factors like urban spatial development and dynamic elevation,make the delineation of urban catchment by digital elevation model(DEM) inaccurate.This paper presented a novel method to delineation the urban catchment using the inverse method,where observed time-series catchment outfall flow volume was employed as input for the water balance model and areas of different catchment were treated as unknown parameters.A developed constrained minimization objective function was combined to solve the model and minimized error between observed and modeled outfall flow is satisfactory for the presenting of a set of catchment areas.The differences of catchment area making by DEM and inverse model played an important role in assessing integrity of drainage network and practice of low impact design.更多还原