發(fā)布時間：2018-01-25 12:53

  本文關鍵詞： 海河流域 降水 同位素　出處：《天津師范大學》2014年碩士論文　論文類型：學位論文

【摘要】：海河流域是我國東部地區(qū)水資源問題最嚴重的流域之一。近些年來,受全球變暖和人類活動的影響,流域內水資源與環(huán)境問題日趨嚴峻,一方面流域內天然來水減少,流域產流匯流能力明顯下降,另一方面流域下墊面發(fā)生劇烈變化,極大地改變了流域內的水文循環(huán)路徑。認識環(huán)境變化下的流域水文循環(huán)特性,揭示其水文循環(huán)過程,可為流域水資源管理提供水文學基礎支撐。本研究利用穩(wěn)定同位素方法對流域內降水穩(wěn)定同位素(δD和δ180)進行了調查,旨在揭示流域內降水同位素的時空變化規(guī)律及其與地理、氣象要素和ESNO事件的關系。 本文在研究海河流域內降水同位素時間變化特點時,發(fā)現(xiàn)具有顯著的季節(jié)效應。利用2012年6月25日至2012年12月31日獲得的連續(xù)時間下收集的六個取樣站點的降水樣品及分析獲得的數(shù)據(jù),得出海河流域大氣降水線為：δD=7.839δ180+5.110,這與全球大氣降水線的斜率相近,還發(fā)現(xiàn)了本文研究站點的氘盈余變化特征是夏季小于10‰,冬季大于10‰,這些都與海河流域距離海洋較近的事實相符。利用HYSPLIT模型顯,追蹤了降水時刻前48個小時內降水氣團后向軌跡,模擬的軌跡包括氣團水平和垂直方向的運移路徑,發(fā)現(xiàn)季風期δ180出現(xiàn)低值時,水汽來源于南來季風,這與海河流域大氣環(huán)流背景相符。還發(fā)現(xiàn)海河流域在夏季季風期間降水中穩(wěn)定同位素有降水量效應無溫度效應,其余月份表現(xiàn)為有溫度效應無降水量效應。利用本文的9個研究站海拔和緯度數(shù)據(jù),分析出海河流域降水中δ180體現(xiàn)了海拔效應,但緯度效應沒有很好的體現(xiàn)。本文對我國東部季風區(qū)進行更細的區(qū)分,發(fā)現(xiàn)在相同季風區(qū)中各站的降水中穩(wěn)定同位素518O在暖半年與對應SOI關系一致；利用本文整理的數(shù)據(jù),還發(fā)現(xiàn)在在ElNino年我國東部季風區(qū)多個研究站點穩(wěn)定同位素δ180與對應SOI有負相關關系,證實了降水中穩(wěn)定同位素與大尺度的環(huán)流具有一定的關系。
[Abstract]:Haihe River Basin is one of the most serious water resources problems in eastern China. In recent years, due to global warming and human activities, water resources and environmental problems in the basin are becoming increasingly serious. On the one hand, the amount of natural water in the basin decreases, the capacity of runoff and confluence decreases obviously, on the other hand, the underlying surface of the basin changes dramatically. The hydrological cycle path in the basin has been greatly changed, and the hydrological cycle characteristics of the basin under the changing environment have been recognized, and the hydrological cycle process has been revealed. In this study, the stable isotopes (未 D and 未 180) of precipitation in the basin were investigated by using the stable isotope method. The purpose of this paper is to reveal the temporal and spatial variations of precipitation isotopes and their relationships with geography, meteorological elements and ESNO events. In this paper, the characteristics of isotopic time variation of precipitation in the Haihe River basin are studied. A significant seasonal effect was found. Precipitation samples from six sampling stations collected from June 25th 2012 to December 31st 2012 and data from analysis were used. It is concluded that the precipitation line of Haihe River Basin is 未 D ~ (7.839) 未 ~ (180) 5.110, which is close to the slope of global atmospheric precipitation line. It is also found that the variation characteristics of deuterium surplus are less than 10 鈥，

本文編號：1462892