Regional Physical Geography

By analyzing the physical geography, regional hydrology and geology information, and groundwater equilibrium of DunHuang Basin, this paper simulates the aquiferous layer which has the thickness of 250 m, and consider it as two dimension mixed layer which is heterosphere and isotropy.

通过敦煌盆地自然地理和区域水文地质及盆地地下水均衡分析，将250m左右深度处稳定流线以上的含水层作为数值模拟对象，概化为非均质各向同性平面二维流混合层；

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The regional physical geography condition is the decisive factor for producing the ecological environmental problem in western China, but strong human activity and pressure to the regional ecological environment are the main reason of causing and aggravating the ecological environmental problem.

区域自然地理条件是产生西部生态环境问题的决定性因素，但强烈的人类活动及其对区域生态环境的压力则是引发和加重西部生态环境问题的主要原因。

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We then analyze and conclude that these differences are caused by the differences of regional physical geography and land-use type.

造成这一现象的原因是区域自然地理环境和土地利用方式的差异。

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