圖書典藏及影音數位平台

行政院於民國81年核定「臺灣地區地下水觀測網整體計畫」及民國98年核定「地下水保育管理計畫（98～103年度）」後，至民國102年底，本署已於全台各地下水分區完成約747口自記式地下水觀測站井之建置工作，並以水文地質調查、重要地區地下水調查與補注試驗、地層下陷監測調查，蒐集長期且整體之地下水環境基礎資料。 然臺灣局部地區因地下水超抽所衍生國土資源損害，其主要原因之一，即在於缺乏地下水觀測資料整合資訊平台，提供地層下陷防治策略擬定之參考。地下水水位及水文地質等地下水環境資料之觀測及蒐集，乃為提供此地下水觀測資料資訊平台之必要工作，故需仰賴水文地質調查、地下水觀測站井之建立及觀測資料整合應用，同時配合地下水水資源管理及加強地下水補注等措施，方可紓緩地層下陷，並達到地下水水資源之永續經營。 台灣地區由於旱澇分明，河川短淺，水庫淤積嚴重，地表水留滯不易，導致地表水之供水量不足。地下水因水量豐沛、取用便利，各方引為替代水源，但地下水在長期大量消耗之下，導致地層下陷，沿海地區則會引發海水倒灌，地下水鹽化等諸多問題，近年來更危及高鐵行車之安全，引起國人嚴重關注。本署為掌握地下水情，已先於數年前建置完成『台灣地區地下水觀測網』，大量並有系統的收集地下水水位資料，迄今已逾二十餘載。然為因應地下水管制及管理之需求，防止地層下陷日益惡化，保育地下水源，以達地下水永續利用之目標，本計畫除加強改善現行資料之收集、傳輸、檢核、分析與儲存的方式，提供即時、正確、完整的地下水情資訊外，另以數值模式模擬或界定地下水管制區內可觀測範圍與無法被觀測的範圍，作為檢討觀測井存續或增補建置之參考。又因地層下陷或自然環境變化所產生的井頂高程變異，亦需予精確的測量以檢核、修正所觀測之水位。 本計畫另擬強化『地下水觀測網』資料庫系統功能，綜合整理相關資訊，並呈現觀測資料、設備維護與使用之紀錄、抽水試驗資料，提供相關分析以供資料檢核與後續之加值應用。再為因應自然環境之變化影響地理高程，擬逐區量測井頂高程，以修正相關之地下水位。另根據水井清查之資料與觀測井之位置與釐清觀測範圍，作為現有觀測井增補存廢之參考。

The objective of Project “the Applications and Analysis of Observant Groundwater Data in 2013” by Taiwan’s Water Reservoir Agency (WRA), besides improving current procedures of collecting, transmitting, analysis and evaluation data, is to provide correct information of influential area for each groundwater observant well, suggesting potential location for future setup of new observant well. Since the elevation of top end of observant well gradually changes due to corrosion, land subsidence, or earthquake, measurement of the change periodically is necessary for correcting groundwater level. The project completes part of the measurements fulfilling WAR’s annual need to keep up the periodical measurement. Also the project evaluates current setup of common observant well, the type of well nowadays no longer functioning, suggesting whether a common well should be terminated or rebuilt to standard one. The project creates “Groundwater Information and Analysis System,” a software application which can store all information related to setup of observant well and, with the help of signal analysis, help evaluating the correctness of collected data. Video taken deep from borehole of the observant well can be stored in the system and also varies video from different well logs or measured at different time can be compared at same depth of location. The project also calculates effective area of observant well within which area artificial pumping can be measure with significant amplitude variation. Take Choushui River Alluvial Fanfor example, there are 33 observant well show no specific pattern of pumping, 6 common wells suggested of eliminating and replaced with one of vicinity. As for the measurement of well height, the project completes 163 wells inChianan Plain，147 wells in Pingtung Plain，and 23 wells in Longitudinal Valley. A total of 333 wells were measured and documented.