Study on Wetland Connectivity Technology in the Urban Coalmine Subsidence Area of Huaibei, China—Hydrological Guarantee Analysis

Abstract

A daily-process hydrological simulation model was developed according to the principles of water balance, with the requirements of navigation, flood control and water regulation of the planned connected wetlands. Four aspects of the wetlands were analyzed, namely the recharge-discharge relationship between surface water and groundwater, environmental water requirements, constructed wetland purification, and timely water diversion. The water sources of the connected wetlands in the subsidence area were also calculated. The daily-process model was used for different hydrological years to simulate the connected wetlands, including aspects such as navigation guarantee, flood control and available regulated water resources. Based on the study results, the following conclusions were made: (i) Water diversion from rivers may be used for water utilization, and navigation may be satisfied in normal years. (ii) A certain amount of water diversion is required to supply the wetlands and to maintain navigation in consecutive dry years. However, a small amount of water remains which may be utilized when the water originates from wetland purification and water diversion on appropriate occasions. (iii) The simulation of flood risk based on hourly analysis showed that the connected area is capable of preventing the threat of a 50-year flood.