圖書典藏及影音數位平台

由於航空攝影測量係屬高度專業性質技術，依規定應由專業測量技師及資訊相關人員辦理，且需配合航空器與攝影器材等，本局現有編制並無相關人力、技術及相關設備與儀器得以據以辦理，爰研擬本計畫據以延續辦理。

To the sustainable management of the JiJi Weir, Central Region Water Resources Branch, 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.For long-term operations management and data digitalization needs, 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 20 times of aerial surveying conducted in the period from 2007 to 2023. The surveying area is 8,000 hectares in 2023.In 2023, The aerial survey operations were completed on November 28. Orthophoto, digital elevation model, topographic map, section map, erosion comparison, H-A-V calculation, water storage capacity calculation, GIS system data and Skyline 3D GIS establishment will be accomplished in the project. Moreover, airborne 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.Unlike last year, the Jiji Weir stopped using the high water level operation strategy in 2023 and has experienced several typhoon. The storage capacity in 2023 increased by 1.2155 million cubic meters compared with the storage capacity in 2022, which is a significant increase in storage capacity. The erosion of the main river channel is about 2 to 4 meters, and there is siltation of about 1 to 3 meters on the high beach upstream of the barrage and in front of the barrage. The water gate in front of the weir reflects the general situation, and the siltation situation in front of the barrage has descreased.