摘要
基于GIS软件平台Arcinfo9.0,从1987年和2002年两个时期的TM和ETM遥感数据中提取了甘州区土地利用数据,分析了该区土地利用/覆被的时空变化及其对水资源的影响。结果表明:1987-2002年该区土地利用发生了很大变化,荒漠地、耕地及城镇及交通用地增加,其中面积增长最多的是荒漠地,增加了6.18×104hm2,其次是耕地;牧草地、林地、水域及其他未利用地面积有所减少,减少最多的是牧草地,减少了3.74×104hm2,占总减少土地面积的50.92%。土地利用/覆被变化改变着工农业用水、地表蒸发、土壤水分状况及地表覆被截留量,进而对区域水资源产生重大影响:地表年径流量在入境莺落峡径流量略显增加的状况下,而出境高崖水文站水量却持续下降,1987-1994年平均为11.135亿m3,1995-2002降至平均7.645 7亿m3,降幅达32.01%;地下水水位下降明显,新沟测点地下水位下降为原来的67.99%,石岗墩测点下降了47.58%,且水位下降幅度呈现不断增加趋势,使泉水溢出量减少,给甘州区生态经济可持续发展构成了严重威胁。
The data of Ganzhou land use changes were extracted from RS data of TM and ETM in 1987, 2002, based on Arcinfo 9.0 of GIS software platform. The paper analyzed spatio-temporal changes of land use and its influence on water in Ganzhou during 15 years. The result showed that. the great changes took place in Ganzhou from 1987 to 2002. The areas of desertificated land, cultivated land and city/traffic land were rising, among which, the most of growing land was desertificated land, increased 6. 18 3.74 × 10^4 hm^2 （60.2%）. The secondary growing land was cultivated land. The most significant reduction of land use was grassland, shrinked 3.74 × 10^4 hm^2 （50.92 %）. LUCC had altered industrial and agricultural water, exhalation of earth＇s surface, soil moisture regime and surface retention, which greatly affected water resources of region. Annual runoff, flowed into this district, slightly showed ascension in Yingge gorge, but consistantly cut down in Gaoai hydrometric station that water flowed out-average 1. 135× 10^8 m^3 from 1987 to 1994, reduction to average 7. 645 7 × 10^8 m^3 from 1995 to 2002. Ground water level distinctly descendedreduction 67.99% in Xingou measuring point, 47.58G in Shigangdun measuring point, which made spillover of fountain shrink and brought severe threats to sustainable development of Ganzhou distriet.
出处
《水土保持研究》
CSCD
北大核心
2009年第4期270-274,共5页
Research of Soil and Water Conservation
基金
水利部公益性行业科研专项经费项目(200801015)
华北水利水电学院高层次人才科研启动项目
华北水利水电学院青年基金项目(HSQJ2009015)
关键词
3S
土地利用/覆被变化
水资源定性定量分析
甘州区
3S
LUCC
qualitative and quantitative analysis of water resource
Ganzhou district of Zhangye
