建議 - 結合地電阻法與TDR於土層含水特性之監測

1、未來可嘗試改變 TDR 感測器型式或安裝方式，以降低乾溼側θ-σ的遲滯(hysteresis)現象

2、TDR 導電度與體積含水量之空間解析度差異及量測範圍影響需做進一步探討。

3、未來可嘗試直接於現地土層，以地電阻法搭配結合量測導電度、含水量的多功能 TDR 監測系統，於現地土層場址各點位置與深度進行現地率定與監測，以期進一步探討非飽和土層之含水特性。

4、砂箱試驗時因砂箱模型小，故解析度要求較高，因此試驗時 TDR 感測器埋置方向為水平方式。而未來於現地進行試驗時，可嘗試將 TDR 感測器埋置方式由水平如圖5- 1（a）改為垂直埋入如圖 5- 1（b）所示，

如此可將 TDR 感測器體積含水量與導電度空間解析度靈敏性較大之方向置於較均質之土層中，以解決地電阻場址參數濕側與乾側率定時之遲滯（(hysteresis)）現象。

5、未來進行現地試驗時，TDR 感測器所能量測的體積含水量與導電度最小範圍需與 ERT 測線最小解析度（約測線排列間距之一半）相同，以減少二者量測結果之差異。另TDR 埋設位置與 ERT 測線之距離、仍需做進一步探討，以使現地量測結果能交互印證並避免量測時互相干擾。

圖5- 1 TDR 感測器體積含水量與導電度量測範圍差異性示意圖

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在文檔中結合地電阻法與TDR於土層含水特性之監測 (頁 111-118)