Monitoring Of Land Use Dynamics And Environmental Assessment Of Shuikou Reservoir In Mid-Minjiang River Based On Satellite Remote Sensing Images

Remote Sensing technology is very important for monitoring land use changeand detecting land use changes. In this paper we use three temporal LandsatTM/ETM+ images to detect land use change of Shoukou Reservoir in mid-MinjiangRiver of Fujian Province with post-classification method. Land use change areas areextracted with post-classification method. For further study on the temporal andspatial characteristic of land use changes in the study area from 1986 to 2000, themathematical methods are established. The analysis of the change informationindicates that land use in the study area had changed greatly during the study period.The area of forest decreased greatly; on the other hand the area of water increasedgreatly. Built-up land, agriculture land and bare land also changed. Then we explorethe inherent mechanism in the study area witch caused the changes. Shuikou Reservoir was built in 1987 and has inundated 16 towns, 89 villages,147 natural villages, belonging to Yanping District of Nanping City, Gutian County,Youxi County and Minqing County since the Shuikou Reservoir was construction.The immigrant residents were mainly distributed along two sides of Minjiang River.The ecology and environment of Shuikou Reservoir changed dramatically. In orderto analyze these changes, we process thematic analysis after land use changedetection has been done. Thematic studies involve: 1) using density slicing method toanalyze distribution of Minjiang River suspended sediment, and using Red-Greenmethod to detect the dynamic changes of Minjiang River; 2) extracting inundatedarea of Shuikou Reservoir with mask-out method. After this we get land use changetypes of inundated areas and analyze dynamic changes of the Reservoir; 3) usinglandscape spatial patternanalysis method to assess ecologic environment of the study IIarea, and assess Shuikou Reservoir environment affected by the construction of theShoukou Reservoir; 4) useing image enhancement and image transformationmethods to study fracture texture of Wankou area to assess the Reservoir inducedearthquake, as Shuikou Reservoir has arose earthquake frequently.