圖書典藏及影音數位平台

集集攔河堰上、下游河道及斗六堰航空測量(含地形、大斷面測量)及地理資訊系統維護。

To the sustainable management of the JiJi Weir, Central Region Water Resources Office, Water Resources Agency, Ministry of Economic Affair, has collected the environmental data for long-term change detection of river environment information around the JiJi Weir since it was operated formally in 2002. The environmental data includes topographic survey, cross-section of river, satellite image, etc.The "JiJi Weir aerial surveying and geographic information system development project" started at 2007, aiming to digitalize and manage the previous surveying, satellite images, and relevant information. The aerial surveying range has expanded since 2009, which included Chingshui River Douliu Weir and south-to-north connecting channel, result in meeting the expectation of management and treatment planning. There were 12 times of aerial surveying conducted in the period from 2007 to 2017. The surveying area is 8,000 hectares in 2019.Orthophoto, digital elevation model, topographic map, section map, erosion comparison, H-A-V calculation, water storage capacity calculation, GIS system data update and Skyline 3D GIS establishment will be accomplished in the project. Moreover, air LiDAR surveying result will be used to produce the DEM in 1 meter resolution in order to aid the management needs and treatment planning. All the result of the project will be listed in the report in detail.The total impoundment of JiJi Weir is approximately 242 hectares. The coverage area full water level in December of 2017 and November of 2019 is 166.22 and 178.90 hectares. The effective impoundment in 2017 and 2019 is 4.111 and 539.49 million cubic meters, which increased 128.36 thousand cubic meters from 2017 to 2019, equivalent to 31.2 percent of effective impoundment. These show that without sediments caused from typhoons or torrential rains the results of dredging are great.