圖書典藏及影音數位平台

水庫集水區之違規開發，將加劇水庫淤積情形，在土地利用管理首重防範於未然。依據「水質水量保護執行巡查作業注意事項」，為強化水質水量保護區之保護，應辦理保護區之年度巡查作業。 由於曾文水庫集水區幅員廣大，透過衛星影像變異點辨識與查勘，以及現地定期道路巡查，在發現疑似違規開發行為時，可即時通報權責機關查處，預防違規開發行為擴大，並確保執行相關水土保持與復原工作。另本年度亦納入牡丹及阿公店水庫衛星影像變異點辨識，加強本局集水區巡查效益。

Abstract Objective Zengwen Reservoir watershed is a wide, hilly, rainy and geologically fragile area, with intensive rainfall during wet seasons. The fast-growing economy also increases the rate of developments within Zengwen Reservoir watershed. After Typhoons, the heavy rain triggered landslides and debris flow thus brought the rocks and muds into the reservoir. Those massive mud and sand deposition shall decrease the function and ultimate life of reservoir. Therefore, integral applications of satellite images and periodical ground patrol are used to finding out the illegal land use and the landslides caused by nature disasters. 2. Satellite image processing and analysis Satellite image SPOT6/7 satellite images are used in this project. There are 9 Znegwen Reservoir wastershed satellite images (cloud ratio less than 20%) obtained during of this execution. And there are 8 Mudan Reservoir satellite watershed images (cloud ratio less than 20%). And there are 8 Agongdian Reservoir satellite watershed images (clout ratio less than 20%). 3. The periodical road patrol in Zengwen reservoir watershed (1)Vegetation change detection of satellite image The purpose of satellite image vegetation change detection can reduce the works of ground patrol. The field investigations can be focused on the vegetation change area and avoid the unnecessary investigations.A total number of 174 vegetation change area are investigated in this project. There were 10 suspected illegal events reported to the administrations, of which 5 confirmed legal, and 3 confirmed illegal. There were a total of 94 mutation points in the water collection area of Mudan Reservoir. There were 4 suspected illegal events reported to the administrations, of which 2 confirmed legal, and 2 confirmed illegal. There were a total of 99 mutation points in the water collection area of Agongdian Reservoir. All of the differences in the interpretation of historical images by Google satellite images in the past years were either fallow or seasonal crops, which undoubtedly violated the regulatory variation points. (2)Monthly road patrol The monthly road patrol contains the roads that higher than the class of country road. There are 18 paths in monthly road patrol. The executive team plans to increase the monthly inspection density on the roads near the reservoir area (eg Jia 143, Tai 3, Jia 145) so as to maintain the surroundings of the reservoir area.There were 4 suspected illegal reported to the adminstrations, and 2 confirmed illegal. 4. Data compilation and review over the years All the confirmed illegal vegetation change from 2011 to 2019 had been closed down. The construction scope of The No. 1412-7 Lot No. of Dapu Section and The No.574 Lot No. of Leye Section were report at 2018.The he Chiayi County Government was confirm that two cases had been closed down. There are total 10 satellite images point of variation and 4 road inspection variability were reported as suspected irregularity variation points this year , of which 4 were confirmed to be illegal, 5 were confirmed to be legal, and 5 were pending investigation. and continued to be tracked on a monthly basis.