上海国土资源
上海國土資源
상해국토자원
2011年
3期
41~45
,共null页
王洁 吴创收 杨世伦 陈燕萍 陈沈良 张文祥
王潔 吳創收 楊世倫 陳燕萍 陳瀋良 張文祥
왕길 오창수 양세륜 진연평 진침량 장문상
海滩 沙嘴 海岸侵蚀 脆弱性分析 3S技术
海灘 沙嘴 海岸侵蝕 脆弱性分析 3S技術
해탄 사취 해안침식 취약성분석 3S기술
beach; sand spit; coastal erosion; vulnerability analysis; 3S technologies
玉带沙是海南岛东部博鳌万泉河口的一条细长沙嘴,也是我国重要旅游海滩之一。为了揭示近期玉带沙的冲淤演变趋势,选择了1988年以来4个年份的RS图像,利用现场GPS监测的海滩地形推算出校正后的低潮位水边线,并使用GIS软件计算各年份低潮线以上的玉带沙面积。结果表明:1988~2005年玉带沙呈显著蚀退趋势,平均蚀退70m(4.1m/a),面积减少35%。分析认为:玉带沙蚀退主要原因是海平面上升和万泉河入海泥沙的减少。在气候变化与人类活动的双重作用下,玉带沙呈现高度脆弱性,值得关注。
玉帶沙是海南島東部博鼇萬泉河口的一條細長沙嘴,也是我國重要旅遊海灘之一。為瞭揭示近期玉帶沙的遲淤縯變趨勢,選擇瞭1988年以來4箇年份的RS圖像,利用現場GPS鑑測的海灘地形推算齣校正後的低潮位水邊線,併使用GIS軟件計算各年份低潮線以上的玉帶沙麵積。結果錶明:1988~2005年玉帶沙呈顯著蝕退趨勢,平均蝕退70m(4.1m/a),麵積減少35%。分析認為:玉帶沙蝕退主要原因是海平麵上升和萬泉河入海泥沙的減少。在氣候變化與人類活動的雙重作用下,玉帶沙呈現高度脆弱性,值得關註。
옥대사시해남도동부박오만천하구적일조세장사취,야시아국중요여유해탄지일。위료게시근기옥대사적충어연변추세,선택료1988년이래4개년빈적RS도상,이용현장GPS감측적해탄지형추산출교정후적저조위수변선,병사용GIS연건계산각년빈저조선이상적옥대사면적。결과표명:1988~2005년옥대사정현저식퇴추세,평균식퇴70m(4.1m/a),면적감소35%。분석인위:옥대사식퇴주요원인시해평면상승화만천하입해니사적감소。재기후변화여인류활동적쌍중작용하,옥대사정현고도취약성,치득관주。
Yudaisha is a slender spit of Wanquan estuary in Bo'ao,east of Hainan Island,which is one of the renowned beach resorts in China.In this research,the purpose is to reveal the erosion-accretion trends of Yudaisha beach in recent years.Based on 3S technologies,4 different years remote sensing image were selected,beach terrain was measured by GPS technology,then the evolution pattern of Yudaisha beach was analysed by GIS technology.The results indicated that distinct landward erosion had appeared in the coastline of Yudaisha beach from 1988 to 2005,the average landward erosion distance is 70m(4.1m/a) and the area reduced 35%.The coastal erosion was attributed to sea level rise and sediment load decrease of Wanquan river.With the impact of climate change and increasing the intensity of human activities,the Yudaisha beach is fragile,so we should pay close attention to it.