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长江源区基于坡面尺度的土壤水热过程模拟研究 被引量:7
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作者 刘光生 王根绪 赵超 《长江流域资源与环境》 CAS CSSCI CSCD 北大核心 2015年第2期319-326,共8页
长江源多年冻土区土壤水热传输过程机理与模拟,是广泛关系到高原生态环境保护恢复和区域水文过程的关键科学问题。因此,以GEOtop模型为研究平台,以长江源不同植被盖度下(裸地、30%、65%和92%)高寒草甸的观测数据为基础,检验模型对土壤... 长江源多年冻土区土壤水热传输过程机理与模拟,是广泛关系到高原生态环境保护恢复和区域水文过程的关键科学问题。因此,以GEOtop模型为研究平台,以长江源不同植被盖度下(裸地、30%、65%和92%)高寒草甸的观测数据为基础,检验模型对土壤水热迁移过程的描述与模拟精度。总体而言,GEOtop模型需要率定的参数较少,从而减少模型模拟的不确定性,提高了模拟精度。对不同植被盖度下土壤温度、水分和实际蒸散发模拟的NSE系数基本达到0.8,表明模型能准确模拟高寒生态系统土壤的水热传输过程,可以作为长江源区土壤水热过程的有效模拟工具。 展开更多
关键词 长江源 多年冻土 水热过程 GEOtop模型
原文传递
Geotop of Lut Playa: Quaternary Geomorphologic Evidence and Civilization
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作者 Adel Sepehr Seyed Ali Almodaresi 《Journal of Earth Science and Engineering》 2013年第3期168-179,共12页
The cultural and geomorphological heritages in Playas as a key address to find out past fluctuations called geotop. Iran is strategically located on an important trade route (Silk Road) between four cradles of civil... The cultural and geomorphological heritages in Playas as a key address to find out past fluctuations called geotop. Iran is strategically located on an important trade route (Silk Road) between four cradles of civilization namely, Babylon, Mesopotamia, Indus and Yangtze (Chinese). Iran is grafting point of four human civilizations which creates Persian civilization about 4,000 years ago. The Lut Desert and Dasht-e Kavir located the central and eastern Iran have been focal points for human settlements since 7,000 years ago. The geoarcheological findings on the Siyalk hills of Kashan located in the Dasht-e Kavir and Jiroft region located in the Lut desert are confirmations for human settlement since more than 7,000 years ago. Shorehzar that is a Persian equivalent word for Arabic word of Sabkha is considered as a Playa geomorphic type which involves precious evidences of quaternary fluctuations. In this article, geomorphological and paleoenvironmental investigations are integrated to provide a framework of environmental change for the late Pleistocene and early-mid Holocene periods in the main deserts of Iran, Lut. In this article based on main geotops of Lut, the quaternary evolutions have been discussed. The investigations are showing that Playas were bed of civilization in Iran Deserts. 展开更多
关键词 geotops PLAYA SABKHA shorehzar QUATERNARY Lut.
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