圖書典藏及影音數位平台

台灣地區近來社經環境變遷、氣候異常，現有蓄水設施(水庫)抗旱能力不足，枯水期恐無法穩定供水。故實有需要進行可能水庫壩堰勘查及評估，來提出可能壩（堰）址優選方案。為此，水利規劃試驗所去年度辦理「台灣地區可能壩堰址勘查檢討」，惟水庫壩堰勘查及評估的內、外業準備及後續工作甚為繁重，實有需要一完整作業平台來協助水資源規劃作業。 爰此，今年度擬建置「台灣地區可能壩堰址勘查檢討-水資源規劃成果圖資數位建置(1)」，提供可能壩(堰)址相關資訊，以利水資源開發與利用規劃進行與開發的決策參考。

Since Taiwan suffers by the uneven distribution of rainfall and coupled with rapid current of the rivers, water conservation work is comparatively difficult. Moreover, severe floods and droughts seem more frequent than before, and the water demand in urban area continues to grow, which have resulted in a need to explore possible dam sites to solve the problem of water shortage. In conducting a preliminary planning reservoir project, the required information including : (1)watershed geomorphologic factors, stream network, and inundated area of the reservoir, (2) daily flow simulations and exceedence probability analysis, (3) runoff hydrograph for a special rainstorm event or under the probable maximum precipitation (PMP) condition, (4) sediment yield simulation and the analysis of reservoir life. Since the mentioned information depends on the location of the proposed dam site, to develop an efficient way for collecting and analyzing the related information is important. Nevertheless, it would be laborious and time-consuming to fulfill the mentioned work by using traditional methods. Consequently, a digital elevation model was used in this project to obtain the watershed geomorphologic factors, and the geomorphologic information was combined with watershed runoff models for long-term and short-term flow analyses. A database system and open source GIS technique were used in the information system. The user-friendly platform includes total 8 river basins which will be developed within 2 years. In the first year project, the information system for Keelung River, Shuang River, Dajia River, Gaoping River, and Touqian River basins were developed. The Geomorphologic Analysis Module was developed based on the most new available digital elevation dataset. Rainfall Analysis Module and Runoff Analysis Module were developed to estimate spatial average rainfall, rainfall and flow frequency analysis, and flow simulation for gauged and ungauged watersheds. The Reservoir Characteristic Analysis Module was developed to calculate reservoir height-area-volume curve (H-A-V curve). Information systems for Tamsui River , Daan River, and Zengwen River basins will be developed in the second year project, and all the previous developed system will also be integrated on an open source GIS platform to meet the requirement of preliminary planning work for possible reservoir sites.