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1 平原城市水环境问题1.1 城市水文效应的产生豫东平原城市下垫面因素的改变,使城市降雨和径流的关系与农村地区明显不同,因而产生了城市水文效应。主要表现在:一是地面硬化的增加减少了大气降雨的地面入渗损失量,同时减少了蒸散发洼蓄损失量,使下垫面因素调蓄地面径流的能力大大降低,集中表现在城市集流迅速、峰现时间缩短,因而使产流系数、产流量明显增大,地面径流量也随之大大增加;二
1 Plain Urban Water Environment Problems 1.1 Urban Hydrological Effects Changes in the underlying surface of cities in the eastern Henan plain resulted in significant differences between rainfall and runoff in urban areas and rural areas, resulting in urban hydrological effects. Mainly in the following: First, the increase of ground hardening reduces the infiltration loss of groundwater in atmospheric rainfall, meanwhile reduces the loss of evapotranspiration depression and greatly reduces the ability of underlying surface factors to regulate ground runoff, which is concentrated in urban agglomeration Rapid flow, the peak time is shortened, so that the flow coefficient, the flow rate increased significantly increased ground runoff also will be greatly increased;