vegetation bed的意思|示意

And base on the experiment, calculating formula of cross section mean velocity's reduction after planting and bed shears stress of vegetation dam block are established.

同时在试验的基础上，推导得植树后断面平均流速减小值和植物坝段床面剪应力的计算公式。

Lastly, studies transportation characteristic of bed load sediment of upstream end before vegetation dam. Preliminarily clear sand-binding mechanism of vegetation "flexible dam".

最后对植物坝前上游段推移质泥沙的输移特性进行了研究，初步探明了植物“柔性坝”的固沙机理。

The simulation is also made to describe the heat and mass distribution under the same environmental conditions between vegetation soil-bed and bare soil-bed.

同时，在相同环境条件下对有作物覆盖的土壤床和无作物覆盖的土壤床中的水热分布也进行了模拟比较。