The underlying surface conditions of Loess plateau area have been changing great because of human activity, which results in affecting the features of producing run-off and conveying sand.
在人类活动的影响下，黄土高原地区的下垫面条件发生了很大变化，这种变化影响了流域的产流输沙特性。
This conclusion reveals that under the stable weather conditions in Chengdu field simulation of real-time weather forecasting must consider the refinement of the underlying surface conditions.
此结论揭示了稳定天气条件下成都地区气象场的模拟及实时预报必须考虑精细化的下垫面状况。
PDI has many advantages such as simplicity, practicality, easy-to-useage, versatility and universality. And it is suitable to monitor regional drought under complex underlying surface conditions.
PDI模型能够有效地反映地表覆盖和水热组合，简单实用，具有通用性和普适性，适宜于复杂下垫面条件下的遥感旱情监测。
The runoff coefficient of every underlying surface was forecasted in different rainfall conditions by ANN models and compared with conventional method as well.
用该方法对不同降雨条件下每种下垫面的径流系数进行了预测，并与传统方法进行了比较。
The results show that the difference was mainly influenced by solar radiation and the conditions of underlying surface.
结果表明：观测结果差异的大小主要受太阳辐射和下垫面状况影响。
The special topography, climate conditions and the underlying surface with the source of the abundant sand were the material base of forming sand and dust storm.
特殊地形、气候条件和富含沙尘源的下垫面是形成沙尘暴的物质基础；
The data monitoring through the outdoor results are based on, in the indoor the conditions of artificial simulation of runoff, rainfall, underlying surface study on the pollutant transport.
本为通过室外数据监测结果为依据，在室内进行了人工模拟径流、降雨试验。研究下垫面的污染物输移规律。
The data monitoring through the outdoor results are based on, in the indoor the conditions of artificial simulation of runoff, rainfall, underlying surface study on the pollutant transport.
本为通过室外数据监测结果为依据，在室内进行了人工模拟径流、降雨试验。研究下垫面的污染物输移规律。
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