| 叶尔羌河流域裸地潜水蒸发的数值模拟研究 |
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| 引用本文： | 毛晓敏,何长德.叶尔羌河流域裸地潜水蒸发的数值模拟研究[J].水科学进展,1997,8(4):313-320. |
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| 作者姓名： | 毛晓敏 何长德 |
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| 作者单位： | 1.清华大学水利水电工程系 北京100084; |
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| 基金项目： | 国家自然科学基金资助项目(No.59579010) |
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| 摘 要： | 利用地表能量平衡原理、微气象学以及土壤水热迁移理论建立了潜水蒸发模型,并采用全隐式有限差分格式进行求解。在求解过程中,对土壤热运动方程的上边界采用了第三类边界条件,同时采用自动调节步长等方法,增加了数值计算的稳定性,提高了计算速度。用本计算模型模拟了1994年5月份新疆叶尔羌河流域地下水均衡场的裸地潜水蒸发过程,并与当地的试验资料进行了比较分析,结果表明,采用的计算模型和方法可以进行较长时间内裸地的潜水蒸发估算。
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| 关 键 词： | 裸地 潜水蒸发 水热耦合 数值模拟 能量平衡 水汽扩散 叶尔羌河 |
| 收稿时间： | 1996-06-21 |
Numerical Simulation of Ground Water Evaporation from Bare Soil in Yerqiang River Basin |
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| Mao Xiaomin,Yang Shixiu,Lei Zhidong,He Changde,Zhou Kai.Numerical Simulation of Ground Water Evaporation from Bare Soil in Yerqiang River Basin[J].Advances in Water Science,1997,8(4):313-320. |
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| Authors: | Mao Xiaomin Yang Shixiu Lei Zhidong He Changde Zhou Kai |
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| Affiliation: | 1.Tsinghua University, Beijing 100084;2.Management Office of Xinjiang Yerqiang River Basin Shache 844000 |
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| Abstract: | Based on the theory of energy balance of soil surface,micro-meteorology,moisture and heat transfer in unsaturated soil,an evaporation model is established.Then a fully implicit finite difference method with automatically adjusted time step is developed for simulation.In this model,Neumann condition and Cauchy condition are introduced for the upper boundary of moisture and heat transfer,respectively.These made the model both stable and efficient.The model has been tested using the data of Yerqiang River Basin in North-West China for 31 days.Then numerical simulations are performed to examine the effects of soil type, depth to ground water table and weather conditions etc.It shows that the model can be applied to simulate the soil moisture and heat transfer in long period,and can also be used to find out the relationship between evapor ation and external environments. |
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| Keywords: | bare soil ground water evaporation coupled moisture and heat numerical simulation energy balance vapor diffusion Yerqiang River |
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