生態農業：農業地景生態監測及復育【水土保持學系/陳樹群特聘教授】
| 論文篇名 | Analysis of landslide occurrence time via rainfall intensity and soil water index ternary diagram |
| 期刊名稱 | LANDSLIDES |
| 發表年份,卷數,起迄頁數 | 2022, 19, 2823-2837 |
| 作者 | Liu, Yi-Jun; Chiu, Yen-Yu; Tsai, Frank T-C; Chen, Su-Chin(陳樹群)* |
| DOI | 10.1007/s10346-022-01944-1 |
| 中文摘要 | 本研究介紹了土壤水分指數（SWI），即三層筒狀模型中的水深總和，以及降雨數據，以了解台灣崩塌的發生情況。共收集236個歷史實例數據，研究不同類型滑坡的特徵：土石流（DF）、淺層崩塌（SL）和大規模崩塌（LL）。數據表明，大部分DF發生在降雨強度最大的時間附近。然而，一些SL和LL事件表明，SL和LL的發生不僅僅與降雨強度或降雨量有關。 SWI 和筒狀模式中的水深（從上到下：H1、H2、H3）提供了一種有趣的方法來將發生時間的土壤水分含量與崩塌類型相關聯。 DF 事件顯示出最高的 H1/SWI 值，這表明與表層土壤中的含水量相關。降雨後的 LL 事件具有最高的 H3/SWI 比率，表明長時間的降雨事件導致雨水滲入更深的土壤層並觸發這些 LL。我們開發了水深與 SWI 比率的三元圖，以顯示三種崩塌類型的特徵。本研究發現 H2/SWI 值通常在 0.2–0.4 範圍內。在此範圍內，崩塌類型沿 H3/SWI 軸由 DF 逐漸向 SL 轉變，然後向 LL 轉變。因此，三元圖可以解釋崩塌類型隨水深-SWI比的變化，更容易了解崩塌的發生。 |
| 英文摘要 | This study introduces the soil water index (SWI) approach, the sum of water depths in the three-layer tank model, with rainfall data to understand landslide occurrence in Taiwan. A total of 236 historical instance data were compiled to investigate the characteristics of different types of landslides: debris flows (DF), shallow landslides (SL), and large-scale landslides (LL). The data shows that most DF occurred near the time of maximum rainfall intensity. However, several SL and LL events indicate that the occurrence of SL and LL has correlations with more than just rainfall intensity or rainfall amount. The SWI and the water depth in the tanks (from top to bottom: H1, H2, H3) provide an intriguing approach to correlate soil moisture content at occurrence time with the landslide types. DF events show the highest H1/SWI value, which indicates the correlation with water content in the surficial soil. LL events after rainfall have the highest H3/SWI ratio, indicating that prolonged rainfall events cause rainwater to infiltrate a deeper soil layer and trigger these LL. We developed a ternary diagram of the water depth-to-SWI ratios to show characteristics of the three landslide types. This study found that the H2/SWI value is typically in the range of 0.2–0.4. In this range, the landslide type gradually shifts from DF to SL, and then to LL, along the H3/SWI axis. Therefore, the ternary diagram can explain landslide type changes with the water depth-to-SWI ratios and better understand landslide occurrence. |
| 發表成果與本中心研究主題相關性 | 崩塌型態與雨量的關係，最終影響到坡地農業 |
