为进行岩溶湿地生态修复,采用数值模拟的方式进行湿地需水量计算。以会仙湿地为研究对象,在多年平均水位的条件下,采用Mike21模型进行了湿地需水量和补水方案的二维数值模拟。通过建立良丰站与会仙湿地内部水位相关关系,得出湿地多年平均水位为148.86 m。在此水位条件下,计算得出湿地的生态需水量和环境需水量分别为386.51万 m3和367.20 万m3,总体需水量为386.51万 m3。通过地表水系分析,确定了会仙河—古桂柳运河的补水路径,以5 m3/s的流量进行补水,模拟结果显示,补水后湿地水面率在正常范围内。
Abstract
In an attempt to restore the ecology of karst wetlands, numerical simulation was conducted to calculate the water demand of wetland. We employed Mike21 for 2D numerical calculation of water demand and water replenishment scheme of Huixian wetland in the condition of multi-year average water level. By obtaining the correlation of internal water level between Liangfeng Station and Huixian wetland, we identified that the multi-year average water level of Huixian wetland is 148.86 m. Under this water level, the ecological water demand and environmental water demand of the wetland are 3.87×106 m3 and 3.67×106 m3 respectively, resulting in an overall water demand of 3.87×106 m3. Through analysis of surface water system, we determined the water replenishment route from the Huixian River through the ancient Guiliu Canal at a flow rate of 5 m3/s. Simulation results demonstrate that the water surface rate of the wetland remains within the normal range after replenishment.
关键词
湿地需水量 /
补水方案 /
Mike21模型 /
数值模拟 /
会仙岩溶湿地
Key words
wetland water demand /
water replenishment scheme /
Mike21 model /
numerical simulation /
Huixian karst wetland
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基金
国家重点研发计划项目(2019YFC0507502);广西创新驱动发展专项课题(桂科AA20161004-1);广西重点研发计划项目(桂科AB19259015)
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