本文選題：Landsat + 干旱指數(shù)　； 參考：《自然災害學報》2017年04期

【摘要】：為了研究干旱區(qū)綠洲地下水位時空變化特征及其歸因,以新疆開都河兩岸綠洲為研究對象,利用實測地下水埋深數(shù)據(jù)和Landsat數(shù)據(jù)計算得到的改進型溫度植被干旱指數(shù)(MTVDI)相結合,建立了地下水位監(jiān)測關系模型(R2=0.82)。對研究區(qū)1999年到2016年地下水的時空分布進行了監(jiān)測,利用2005年和2003年兩年實測數(shù)據(jù)對模型進行了驗證。結果表明:1)兩年實測地下水位和監(jiān)測水位相關系數(shù)(R2)分別為0.75和0.77,均方根誤差(RMSE)分別為0.17和0.27,平均相對誤差(RME)分別為11.4%和16.7%,研究結果符合研究區(qū)實際情況;利用MTVDI建立的地下水位監(jiān)測模型對干旱區(qū)綠洲一定深度的地下水位監(jiān)測是可行的;2)開都河兩岸綠洲1999年到2016年地下水位年際變化逐漸降低,年內(nèi)地下水位升降顯著;3)地下水位年際降低的主要原因是耕地面積的增加和灌溉方式向高效節(jié)水方式轉變,增加了地下水開采量和降低了補給量。在年內(nèi)隨著渠系灌溉水的作用,使地下水位在季節(jié)性里變化較大。
[Abstract]:In order to study the temporal and spatial variation characteristics and attribution of oasis groundwater in arid area, taking the oasis on both banks of Kaidu River in Xinjiang as the research object, the modified temperature vegetation drought index (MTVDII) was calculated by using the measured groundwater depth data and Landsat data. The monitoring model of groundwater level is established. The temporal and spatial distribution of groundwater in the study area from 1999 to 2016 was monitored and the model was verified by the data measured in 2005 and 2003. The results show that the correlation coefficient of groundwater level and monitored water level is 0.75 and 0.77, the RMSE is 0.17 and 0.27, and the average relative error is 11.4% and 16.7g, respectively. The results agree with the actual situation in the study area. Using the groundwater level monitoring model established by MTVDI, it is feasible to monitor the groundwater level at a certain depth in the oasis in arid area.) the interannual variation of groundwater level in the oasis on both sides of the Kaidu River from 1999 to 2016 decreases gradually. The main reasons for the interannual decrease of groundwater level are the increase of cultivated land area and the transformation of irrigation mode to high efficiency and water saving mode, which increases the groundwater exploitation and reduces the recharge. During the year, with the effect of irrigation water in canal system, the groundwater level changes greatly in seasonal.
【作者單位】： 新疆師范大學地理科學與旅游學院/流域信息集成與生態(tài)安全實驗室;新疆干旱區(qū)湖泊環(huán)境與資源重點實驗室;
【基金】：新疆自治區(qū)青年科技創(chuàng)新人才培養(yǎng)工程(QN2015YX009) 國家自然科學基金(41161007,41461006)~~
【分類號】：P641;TP79

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