关键词: 地形重塑; 植被修复; 生态潜堤; SWAN风浪模型; 长荡湖;

Abstract: In view of the problems of shallow water, large waves and easy suspension of sediment in Changdang Lake, which is not conducive to the growth and restoration of aquatic vegetation, the study on the best scheme of topographic reconstruction in Changdang Lake was carried out. According to the calculation results by SWAN wind wave model, when an ecological dyke with an elevation of 3.00 m was placed at the position about 1 km outside the entering estuary at the west of Changdang Lake, the reduction ratio of wave height and average wave length were more than 16% in adjacent area of ecological dyke and the reduction ratio of wave height and average wave length were about 9% and 12% respectively in the shelter area behind ecological dyke. When an ecological dyke of 3.26 m height was arranged at the periphery of the water source protection area, the reduction ratio of wave height and average wavelength were more than 44% and 31% respectively in the adjacent area of ecological dyke and the wind wave were reduced by about 6%～8% in the shelter area behind ecological dyke. In the center of the lake, wind wave could be reduced by arranging seine and ecological nets. After the topographic reconstruction of Changdang Lake, the intense and disturbance of wind wave could be reduced and the water transparency in local areas could be improved, and eventually the success rate of aquatic vegetation restoration in Changdang Lake could be improved.

Key words: topographic reconstruction; aquatic vegetation; ecological dyke; SWAN wind wave model; Changdang Lake;