摘要:
以北戴河西海滩为例,通过对海滩养护后近岸地形以及表层沉积物的变化进行研究,分析海滩人工喂养后的演化特征:明显遭受侵蚀,平均单宽侵蚀量为44.8 m3/m,滩肩平均蚀退距离15 m,东部侵蚀速率大于西部;新海滩沉积物整体细化,分选变好,喂养4个月后沉积物净输移趋势以沿岸搬运为主,运移方向NE—SW向;离岸潜堤形成的波影区以外海滩明显受到侵蚀,形成侵蚀热点。喂养1年后,填沙保存76%,海滩形态与预期形态较为相近,养滩效果良好。
Abstract:
In this paper, taking the west beach of Beidaihe as an example, we analyzed the evolutionary features after beach nourishment through study of the changes in beach geomorphology and sediments distribution. One year after the beach nourishment project, the beach was obviously eroded. The average erosional volume per unit width was 44.8 m3/m and the average erosion distance of the beach berm was up to 15m. The erosion rate of eastern part of the beach was higher than that of the western part. Beach sediments were changed from coarse to fine in grain size and became well sorted. Four months after the nourishment project, the net transport tendency of the sediments was mainly alongshore in a direction from NE to SW. The beach off submerged breakwaters was eroded more severely without the protection of the offshore submerged breakwaters and there formed erosion hotspots as the result. One year after the beach nourishment project, 76% of the filling sands were retained and the beach geomorphology was similar to the expected. As a whole, the beach nourishment is rather successful.
下载: