頁籤選單縮合
題 名 | 有限差分法應用於模擬裸地蒸發之土壤水分含量剖面=Simulation of the Soil Moisture Content Profile for a Bare Soil Evaporation Using the Finite Difference Method |
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作 者 | 郭勝豐; | 書刊名 | 農業工程學報 |
卷 期 | 42:4 1996.12[民85.12] |
頁 次 | 頁67-73 |
分類號 | 434.222 |
關鍵詞 | 裸地蒸發; 土壤水分含量; 有限差分法; 疊代法; Bare soil evaporation; Soil moisture content; Finite difference method; Iteration method; |
語 文 | 中文(Chinese) |
中文摘要 | 裸地表土蒸發時土層中土壤水分變化情形為灌溉管理所需之基本資料。裸地蒸發之物理現象可概分為兩個階段:(一)穩定期:蒸發率為大氣控制,(二)漸減期:蒸發率為土層中土壤水分控制。本研究依據表土蒸發之物理現象推導數學公式並定義偏微分程之非線性邊界條件,有限差分法及疊代法被應用於求解數學公式並建立模擬模式。 本模式模擬嘉南利會學甲試驗站坋質壤土於地下水為1(m)及2(m)時,裸地表土蒸發伴隨之土壤水分剖面變化情形。結果顯示模式能有效率的模擬表土蒸發及土壤水分變化之物理現象,而地下水位為1(m)及2(m)之土壤水分剖面曲線亦有顯著之差別。 |
英文摘要 | The soil moisture content profile with the effect of bare soil evaporation is the basic data for irrigation management. The physical phenomenon of bare soil evaporation divides into two stages. The steady stage with constant evaporation is controlled by local climate, and the decreased stage is controlled by soil moisture content within soil profile. Considering the physical phenomenon of bare soil evaporation, this study derived a series of equations to define the nonlinear boundary condition. The finite difference and iteration methods are used to solve the mathematical equation and establish simulation model. The silt loam soil in the Hsueh Chia Experiment Station of Chia Nan Irrigation Association was used to test the model. The results show that model can efficiently simulate the relation-ship between bare soil evaporation and soil moisture content profile. Also, the soil moisture profile differs groundwater table changes from 1 meter to 2 meters. |
本系統中英文摘要資訊取自各篇刊載內容。