valley是什么意思

网络释义

用法例句

The primary valleys as the secondary natural units and management units within a nature reserve have strong definition and controllability in its geographic ranges,so that a nature reserve functional division on the basis of valleys has less subjective factors and is convenient for formulating more pertinent reserve planning and relevant management measures.

沟系作为自然保护区内次级自然单元和管护单元,具有较强的分区确限性和可控性,主观因素少,便于制订针对性强的自然保护区规划和管护措施。

Study on the sediment yield and coupling mechanism of slope-gully system;

坡沟系统侵蚀产沙及其耦合关系研究

Experimental study on the sediment yield characteristics in slope-gully system;

坡沟系统侵蚀产沙特征模拟试验研究

The process of erosion sediment yield of slope-gully system in Loess Plateau was studied by using slope-gully system physical model and runoff scouring method,integrating rare-earth element tracing technology.

利用室内概化的坡沟系统模型,结合REE示踪技术,采用放水冲刷试验,对黄土高原坡沟系统侵蚀产沙过程进行了深入研究。

Based on the data from Zizhou and Wangjiagou Experimental stations in the coarse sediment-producing area of the middle Yellow River drainage basin, this study deals with characteristics of hyperconcentrated flows in slope-channel systems in the gullied hilly areas.

以黄河中游多沙粗沙区子洲径流站和离石王家沟试验站的径流场观测资料为基础,对黄土高原丘陵沟壑区坡沟系统中高含沙水流特征进行了研究。

Based on the data from Zizhou and Wangjiagou Experimental Stations in the coarse sediment-producing area of the middle Yellow River drainage basin, this study deals with relationship of sediment-heavily containing flows in slope-channel systems of the gullied hilly areas with the landforms and gravitational erosion.

以黄河中游多沙粗沙区子洲径流站和离石王家沟试验站的径流场观测资料为基础,对黄土高原丘陵沟壑区坡沟系统中高含沙水流特征与地貌因素及重力侵蚀的关系进行了研究。

The objective of this study is to reveal the influence of grass coverage on the time of runoff beginning and stop in the hillslope-gully slope erosion system on loess hilly area.

本项研究旨在通过室内放水冲刷试验,揭示黄土丘陵区坡沟系统坡面不同草被覆盖对坡面流出流时间和终止时间的影响。

It s significant for understanding the soil loss reducing mechanism of grass coverage to study the changeable process and characteristics of overland flow energy with different grass coverage degrees and spatial distributions in the hillslope-gully slope erosion system.

坡面侵蚀是水流能量作用的结果,草本植被对坡面流能量的作用有重要影响,研究坡沟系统坡面草被不同盖度及空间配置下坡面流能量的变化过程与特征,对于揭示草被减蚀作用机理有重要意义。