自受壓飽和合水層抽取地下水而導致之地層下陷，其分析解可作為地層下陷之近似模式，但式中包含兩控制參數一據散餘數民與抽水條數叭。用於預測峙，其值須為已知。根據實測與調金資料可求得兩係數的歷年值及由此而得的估算值。近似模式應用於雲林與嘉義沿海沉陷地區，依據觀測點之所在分成十一區，且求得兩係數之歷年值、估算值，並予以簡易預測。 The analytical solution of the land subsidence caused by an overdraft of groundwater from a confined aquifer could be deemed as an approximate model, which consists of two controlling parameters, the diffusivity Do and the pumping coefficient No. In field application these two coefficients should be known in advance. Field measurements and the survey of well will yield the values of above two coefficients across each year, from which estimated values of conefficents can be obtained in turn. The approximate model is applied to Yuan-Chia region, which is further divided into 11 sub-regions based upon the observing site. Estimated values of Do and No in these I I sub-regions are obtained, and a simple prediction is performed.
