台灣地區對於水資源需求甚為殷切，雖有豐沛之雨量，但因季節分配不均，加上地形與地質條件不佳之因素造成水庫淤積嚴重，因而對於水資源之調配相當不利。淤積最嚴重之阿公店水庫位於沖刷快速泥岩地層，為確保水庫有效庫容，必先了解集水區內泥沙沖蝕來源與主因。有鑑於此，本研究利用合程孔徑雷達差分干涉術（D-InSAR）於豐水期與枯水期間拍攝之影像處理後，可差分出阿公店水庫集水區之地表變形量，並評估集水區內坡度及地層因子對土方變化衝擊大小，以做為集水區之泥沙控制與防治之參考依據。
本研究成果D-InSAR土方變化與不同時期DEM相減比較，每單位面積土方相差3公分。四月到五月降雨量295mm其單位面積地殼與土方變化量約2.06公分，一年降雨量約1314mm其單位面積地殼與土方變化量約17.34公分。要獲取土方變化資訊則需減去集水區之GPS點位變化的內差資訊，研究成果顯示阿公店水庫集水區一年每單位面積垂直土方變化量為13.7公分，誤差來源為大氣與植被對訊號之散射造成影響。雖然在沖蝕量推估上有所高估，但集水區內整體變化趨勢與DEM和GPS變化量經過內差後變化趨勢相同，皆屬東南方崎嵧山區為最大變化處。
D-InSAR雖不如現場量測精準，但可快速且經濟有效的獲取大範圍土方變化驅勢，對於少植被與地形坡度緩和水庫集水區而言，是有效率且高速之量測工具。

Water resource management is an important issue in Taiwan, though the rainfall is rich, but it is not raining evenly in all seasons, therefore many reservoirs were built to reserve as much water as they can. However, due to the bad conditions in topography and geology, there are serious reservoir sedimentation problems in Taiwan, such as A-Kung-Tein reservoir. In order to understand where the sediments come form, 3-pass differential Interferometric Synthtic Aperture Rader（D-InSAR）method is used to study the erosion rate in the watershed and to locate the most seriously eroded area and the controlling factors of erosion rate.
The result shows that the deformation change obtained by D-InSAR is 3cm higher than the DEM aviation. According to the result of D-InSAR measurement, average annual surface change is 17.34cm and the surface of change first month is 2.06cm in the study area. We have to substrate the GPS data to obtain the net soil change, the results show average rate is 13.7cm in depth annually. Although the erosion rate estimated by D-InSAR is too high, the entire pattern of change was similar to DEM and GPS data in the watershed. The error comes from the different time and the plant scattering of radar signal etc.
The accuracy of InSAR measurement is less accurate than the in-suit measurement methods, but it can complete the work much faster and cheaper, therefore, D-InSAR is a useful tool for investigating the trend of soil change for the watershed area with little vegetation cover.

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