【摘要】：為了準(zhǔn)確獲取青藏高原理塘地區(qū)的土壤熱參數(shù),利用2006年8月27日至9月4日期間青藏高原理塘地區(qū)陸面過(guò)程試驗(yàn)采集的土壤溫度資料,分別采用位相法、振幅法以及耦合熱傳導(dǎo)-對(duì)流法計(jì)算了0~10 cm,10~15 cm,15~20 cm三層土壤熱擴(kuò)散率,并用耦合熱傳導(dǎo)-對(duì)流法計(jì)算了土壤液態(tài)水通量密度。根據(jù)計(jì)算結(jié)果,以地表溫度作為上邊界條件,分別模擬了9月19-21日期間10 cm、15 cm和20 cm三個(gè)深度的土壤溫度。對(duì)比模擬值與觀測(cè)值后發(fā)現(xiàn):由于考慮了土壤中液態(tài)水的動(dòng)態(tài)變化,耦合熱傳導(dǎo)-對(duì)流法對(duì)各層土壤溫度模擬效果最為理想,其模擬值與觀測(cè)值的相關(guān)系數(shù)分別為:r10cm=0.97、r15cm=0.98、r20cm=0.99,置信度為99%。其中,對(duì)10 cm深度而言,耦合熱傳導(dǎo)-對(duì)流法模擬的土壤溫度位相比實(shí)際觀測(cè)值平均前移約0.21 h,土壤溫度日振幅比實(shí)際值高估約0.79℃,而振幅法則平均前移約0.45 h,位相法高估土壤溫度日振幅約0.96℃。
文內(nèi)圖片：
圖片說(shuō)明：圖22006年8月27日至9月4日0cm(a)，10cm，，15cm和20cm(b)四層土壤溫度觀測(cè)值及其正弦擬合曲線
[Abstract]:In order to accurately obtain the soil thermal parameters in Litang area of Qinghai-Xizang Plateau, the soil temperature data collected from the land surface process test in Litang area of Qinghai-Xizang Plateau from August 27 to September 4, 2006 were used to calculate the thermal diffusion rate of 0 脳 10 cm,10~15 cm,15~20 cm three-layer soil by phase method, amplitude method and coupled heat conduction-convolution method, and the soil liquid water flux density was calculated by coupling heat conduction-convolution method. According to the calculated results, the soil temperatures of 10 cm,15 cm and 20 cm were simulated with surface temperature as the upper boundary condition from September 19 to 21, respectively. After comparing the simulated values with the observed values, it is found that the coupled heat conduction-convolution method has the best simulation effect on the soil temperature of each layer due to the consideration of the dynamic changes of liquid water in the soil. The correlation coefficients between the simulated values and the observed values are as follows: r10cm 鈮

本文編號(hào)：2511344