围垦对射阳河口海岸地形的影响

采用不同时期具有较高分辨率的卫星遥感影像,快速提取围堤线、平均高潮线,依此分析海涂围垦活动对射阳河口岸滩地形的影响.分析结果表明:(a)河口以北岸滩以蚀退为主,1995-2003年滩线蚀退速率平均为4 ～ 6m/a;河口以南侧为淤长,1995-1999年除五条港淤长速率( 199.2 m/a)最快外,其他地段淤长速率平均为35 m/a; 1999-2003年除迷洋港淤长速率(79.4m/a)最快外,其他地段淤长速率平均为11 m/a.(b)河口以北1995-1999年围堤线基本无变化,1999-2003年围堤线平均向海推移0.94km;河口以南1995-1999年围堤线平均向海推移距离为4.08 km,1999-2003年围堤线平均向海推移距离为2.56km.

Impacts of reclamation on coastal topography in Sheyang Estuary

High-resolution satellite remote sensing images from different periods were used to quickly extract the border dike line and average high-tide line for analysis of the impacts of tidal flat reclamation on coastal topography in the Sheyang Estuary.The results show the following:(a) The beach line north of the Sheyang Estuary was mainly characterized by erosion,with an erosion rate of 4 m to 6 m per year from 1995 to 2003.The beach line south of the estuary was mainly characterized by progradation,with an average progradation rate of 35 m per year from 1995 to 1999,except in Wutiao Port,where the highest progradation rate was 199.2m per year.From 1999 to 2003,the average progradation rate was 11 m per year,except in Miyang Port,where the highest progradation rate was 79.4 m per year.(b) The border dike line in the north of the estuary was almost stable from 1995 to 1999,while it extended seaward by 0.94 km on average from 1999 to 2003.The border dike line in the south of the estuary extended seaward by 4.08 km on average from 1995 to 1999 and 2.56 km on average from 1999 to 2003.