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The earthquake and tsunami that devastated coastal area in Nanggroe Aceh Darussalam Province and North Sumatra Province,especially Nias Island on December 26,2004,caused damage to most mangrove and coastal forests in the areas.Before the 2004 tsunami,there is no report or publication about mangrove and coastal vegetation in Nias Island.The aims of this research were to describe the mangrove forests and coastal vegetation after tsunami disaster and to learn the ecological functions of mangrove forests and co... 相似文献
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Abidin Hasanuddin Z. Djaja Rochman Darmawan Dudy Hadi Samsul Akbar Arifin Rajiyowiryono H. Sudibyo Y. Meilano I. Kasuma M. A. Kahar J. Subarya Cecep 《Natural Hazards》2001,23(2-3):365-387
Jakarta is the capital city of Indonesia with a population of about 10 million people, inhabiting an area of about 25 × 25 km. It has been reported for sometime that locations in Jakarta are subsiding at different rates. Up to the present, there has been no comprehensive information about the characteristics and pattern of land subsidence in the Jakarta area. Usually land subsidence in Jakarta is measured using extensometers and ground water level observations, or estimated using geological and hydrological parameters. To give a better picture about land subsidence, geodetic-based monitoring systems utilizing leveling and GPS surveys have also been implemented.The land subsidence characteristics of Jakarta and its surrounding area areinvestigated using data from three repeated leveling surveys performed in1982, 1991, and 1997, and two repeated GPS surveys conducted in 1997and 1999. Leveling surveys detected subsidence up to about 80 cm duringthe period of 1982–1991, and up to about 160 cm during the 1991–1997period; while GPS surveys observed subsidence up to about 20 cm duringthe period of 1997–1999. Comparison with the hydrological data shows thatland subsidence in Jakarta is strongly related to excessive groundwater extraction. 相似文献
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七里海泻湖湿地演变过程及其生态环境效应分析 总被引：3，自引：0，他引：3
以河北省秦皇岛市昌黎县七里海泻湖湿地为研究区,选取1919～2005年间的4幅地形图和1987年以来的10景landsat TM(ETM)遥感影像为数据源,运用遥感和地理信息系统技术,研究了七里海泻湖湿地近百年的时空演变过程,分析了泻湖湿地演变的影响因素与生态环境效应.结果表明,近百年来,七里海泻湖面积发生明显变化,由1919年的711.1 hm2缩减为2005年的279.1 hm2;1919年泻湖周边沼泽湿地面积为2 263.3 hm2,2005年泻湖周边的沼泽湿地已经基本消失;1956年以前,泻湖湿地以自然演变为主,主要受雨量充沛、入湖河流径流量丰富的影响,泻湖水面面积呈逐年增加趋势,1956以后,受流域开发治理工程、围垦和水产养殖等人类活动的影响,泻湖及周边湿地水动力条件发生改变,泻湖周边天然湿地逐渐为人工湿地所代替,泻湖水面面积减小,淤积加重,湿地生态系统受到极大干扰,呈现出生物多样性降低、景观单一化、湿地效应减弱等生态环境恶化的特征. 相似文献
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