台州东部新区围区海水入侵抗渗计算

Calculation of anti-seepage of seawater intrusion in Taizhou Eastern new reclamation area

台州东部新区将在已建海堤匡围区内发展循环经济,由于海水经海堤堤基渗透入侵,会破坏围区生态环境,抑制海水入侵的方法亟待研究.采用Geo-Studio软件进行海水入侵抗渗计算,为了选择适合渗流数学模型的计算参数,对围区处近海潮汐规律和海堤情况进行研究,确定潮位曲线和海堤模型.结合围区地质条件分析,运用GeoStudio软件建立出海堤建筑物与围区一体渗流数学模型以及地基土层的土水特性曲线.考虑围区实际情况后,提出利用围区内生态湖泊——月湖所蓄淡水产生的水头反向抑制海水入侵作为抗渗方案,并经计算、分析了月湖内不同淡水位对海水入侵的反向抗渗作用,得到满足抗渗的月湖水位为2.1-2.68m.

The eastern part of Taizhou new district will carry out the development of circular economy in coastal reclamation project area.As the seawater from dyke seepage will form the mixed water with the water underground the area,that will impact and damage the surrounding ecological environment in the region.Therefore it is necessary to study the method of restraining the invasion of seawater.In this paper,the Geo-Studio software is used to calculate the seawater invasion.In order to choose the proper parameters of mathematical model of percolation,the tidal laws in coastal waters and the situation of sea dykes in the reclamation area in coastal waters are studied;meanwhile the tide curve and the model of sea dyke are determined.Combining with the analysis of geological conditions in the reclamation area,the Geo-Studio software is used to establish the mathematical model of percolation which includes sea dykes building and reclamation area;and then the soil water characteristic curve of foundation soil layer is got.After considering the actual situation in the reclamation area,anti-seepage measures are put forward for the storage of fresh water by using ecological lake,Moon Lake in the area around the head backward inhibition of seawater intrusion.And then the effect of freshwater level in moon lake on resisting seawater intrusion is analyzed;it is shown that the effective measures is to ensure the Moon Lake water level from 2.1 mto 2.68 m.The anti-seepage method in this paper can provide reference for anti-seepage in the coastal area around.