地理資訊系統推估區域蒸發散量之研究

Using Geographic Information System to Estimate Regional Evapotranspiration

蔡西銘(Shi-Ming Tsai) ； 邱金火(Kin-Forie Chiou) ； 林殷瑋(Yin-Wei Lin)

《中原學報》 29卷3期 (2001/09) Pp. 219-229

https://doi.org/10.6358/JCYU.200109.0219

摘要

蒸發散量在農業、集水區經營、環境科學及氣象學上，均為相當重要之基本資料。但其在以往的研究中，均只針對單一的地貌或作物來作探討，並不能代表一整個區域的蒸發散量。本研究利用地理資訊系統，針對土地使用情形及地表覆蓋之不同而分別建檔，再選擇合適之公式，估算其單一之蒸發散量，並予以加權平均之，以求區域之蒸發散量。
本研究以台灣省桃園區農業改良場作為驗證的對象，並與改良場內蒸發皿之蒸發量作比較，獲致良好之結果，而可進一步應用於估算一區域之區域蒸發皿係數。

關鍵字

蒸發散 ； 地理資訊系統 ； 蒸發皿係數

並列摘要

Evapotranspiration provides important basic information in agriculture, watershed management, environmental science, and climatology. In previous researches, only the evapotranspiration of a single vegetation of land was probed; therefore, it is not good enough to represent a regional evapotranspiration. In this research, the different kinds of land uses and vegetation were filed by using Geo-graphic Information System method. Furthermore, some proper formulas were chosen to estimate each evapotrans-piration and averaged by weighting so that the evapotrans-piration of the region can be found.
In this research, Taoyuan District Agricultural Improvement Station was selected as a pilot study area to figure out its daily evapotranspiration from August to November, 1996. Comparing it with the pan evaporation, it was found that the correlation coefficients of those were over 0.85 each month except that of 0.76 in October. The tendency of calculation values and observation values was similar. Furthermore, it can be applied as a useful tool to estimate the pan coefficient of a regional study.

並列關鍵字

Evapotranspiration ； Geographic Information System ； Pan Coefficient