%0 Journal Article
%T Investigation to the Damaged Farmland as a Result of Disasters Induced by Wenchuan Earthquake Based on Remote Sensing:a Case Study of Tangjiashan area,Beichuan County,Sichuan Province<br>汶川地震次生灾害毁坏耕地的遥感快速评估方法——以北川县唐家山地区为例
%A FAN Jian-rong
%A ZHANG Jian-qiang
%A TIAN Bing-wei
%A YAN Dong
%A TAO He-ping
%A <br>范建容
%A 张建强
%A 田兵伟
%A 严冬
%A 陶和平
%J 遥感学报
%D 2008
%I 
%X Themain suffering area of theWenchuanEarthquake locates in themountainous area ofwestern Sichuan, an areawhich is very prone tomountain hazards such as landslides and debris flows because of themountains and deep val- leys, complex geological structure aswell aswelldeveloped fault zones there. TheWenchuanEarthquake had directly in- ducedmassive secondary disasters such as collapse and landslideswhich destructed large area of farmlands. At the same tmi e, theWenchuan Earthquake also induced more than 30 barrier lakesmaking some farmlands be inundated and de- structed. In order tomake a scientific evaluation of the disaster situation and provide scientific basis for reconstruction and rational settlementofpeople in the suffering area, it isnecessary to acquire the information of the destructed farmlands. In this paper, satellite remote sensing data aswellas appropriate information extractionmethodswere used to acquire the dis- tribution information of farmlands before theWenchuan Earthquake and information of collapse, landslides, barrier lakes afterWenchuan Earthquake based on information such as landform features inmountainous area, landuse information and mi agery characteristics of seasonal aspect. Spatial analysiswas applied to evaluate the farmland loss to provide reference for the reconstruction planning. In this paper, Tangjiashan area ofBeichuan countywas taken as a case study area for evaluating the farmland loss caused by secondarydisasters. NDVIwasderived from the SPOT mi age data ofNovember10th, 2007. Based onNDVIand landform information, the farmlandswere identified and the distribution information of farmlandswas obtained. Manual correctionswere then used to elmi inate possible errors in the previous farmland identification. TheFORMOSAT-II mi age of May 14th, 2008 and theALOS mi age of June 4th, 2008 were used to acquire the information of these secondary disasters such as collapse, landslides aswellasbarrier lakes induced by theWenchuanEarthquake based onman-computer interac-tive interpretation. Based onGIS technology, the rapid evaluation of farmland destructionwas carried outaccording to the comprehensive analyses of farmland distribution before theWenchuan Earthquake and the distribution information of these secondary disasters induced by theWenchuan Earthquake. Then the temporal and spatial characteristics of farmland loss were analyzed. The results show that the secondary disasters such as collapse, landslides aswellasbarrier lakeswere very serious in the study area. Therewere 533 sites ofcollapse and landslideswhich had a total area of1408.20 hm2, aswell as barrier lakeswith an area of604.69 hm2in the study area. The area of the farmlandsdestructed by secondary disasters were 86.88 hm2accounting for8.84% of the total farmland area. The distribution of collapse, landslides and destructed farmlandswas consistentwith the distribution of fault zone. And the destruction rate of the farmland on the fault zonewas 18.74%, accounting f
%K Wenchuan Earthquake
%K collapse
%K landslide
%K barrier lake
%K remote sensing
%K farmland<br>汶川地震
%K 崩塌
%K 滑坡
%K 遥感
%K 堰塞湖
%K 耕地
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=E62459D214FD64A3C8082E4ED1ABABED5711027BBBDDD35B&cid=A41A70F4AB56AB1B&jid=F926358B31AC94511E4382C083F7683C&aid=A791B2B8DA3CC5E2FB00AB8463FB9EA4&yid=67289AFF6305E306&vid=59906B3B2830C2C5&iid=B31275AF3241DB2D&journal_id=1007-4619&journal_name=遥感学报&referenced_num=1&reference_num=5