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。

youdao

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。

youdao

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。

youdao