本文選題：熱融湖 + 橫向擴張速率�。� 參考：《冰川凍土》2017年02期

【摘要】：熱融湖是高緯度和高海拔富冰多年凍土區(qū)重要的自然景觀。這些湖由于富冰多年凍土或地下冰的融化而形成,由于湖水向周邊多年凍土傳遞熱量而持續(xù)擴張。以青藏高原北麓河地區(qū)一個熱融湖的信息和凍土監(jiān)測資料為基礎,運用柱坐標系下伴有相變的熱傳導模型模擬了以不同的橫向擴張速率演化的熱融湖湖下融區(qū)的發(fā)展過程。結果表明:在青藏高原多年凍土厚度為75 m的北麓河盆地,分別以橫向擴張速率0.10 m·a~(-1)、0.15 m·a~(-1)、0.20 m·a~(-1)和0.25 m·a~(-1)演化的熱融湖,在湖形成分別達760 a、703 a、671 a和652 a時,湖下形成貫通融區(qū),相應的多年凍土從上向下融化的平均速率分別為8.22 cm·a~(-1),8.89 cm·a~(-1),9.31 cm·a~(-1)和9.74 cm·a~(-1)。熱融湖的橫向擴張速率對湖下的融區(qū)發(fā)展和土壤熱狀況有重要的影響,在現(xiàn)場調查資料的基礎上選取正確的熱融湖橫向擴張速率是熱融湖對多年凍土熱狀況作用數(shù)值模擬研究的必要前提。
[Abstract]:Hot thawing lake is an important natural landscape in high latitude and high altitude ice-rich permafrost region. These lakes are formed by the melting of ice rich permafrost or underground ice and continue to expand because of the heat transfer from lake water to the surrounding permafrost. Based on the information of a hot thawing lake and the monitoring data of permafrost in the northern part of Qinghai-Xizang Plateau, a thermal conduction model with phase transformation in cylindrical coordinate system is used to simulate the development process of the thawing area under the lake with different lateral spreading rates. The results show that in the North Luhe Basin with a thickness of 75 m permafrost in the Qinghai-Xizang Plateau, the thermal thawing lakes, which evolved at a transverse spreading rate of 0.10 m / a ~ (-1) and 0.25 m ~ (a) ~ (-1) of permafrost, respectively, formed a thawing zone under the lake at 760 a, 703 a, 671 a and 652 a, respectively, and the thawing zone was formed under the lake at a transverse spreading rate of 0.10 m / a ~ (-1) and 0.25 m / a ~ (-1), respectively. The average melting rates of permafrost from top to bottom are 8.22 cm / a ~ (-1) and 9.74 cm / a ~ (-1) respectively. The lateral expansion rate of the heat thawing lake has an important influence on the development of the melting area and the soil thermal condition under the lake. On the basis of the field investigation data, it is necessary to select the correct lateral expansion rate of thermal thawing lake for the numerical simulation of the effect of thermal thawing lake on permafrost.
【作者單位】： 肇慶學院數(shù)學與統(tǒng)計學院;中國科學院西北生態(tài)環(huán)境資源研究院凍土工程國家重點實驗室;
【基金】：國家自然科學基金項目(41271076) 廣東省自然科學基金項目(2015A030313704)資助
【分類號】：P642.14;P901

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