高立式沙障不同叠加模式的阻沙量对比分析

为了解决尼龙阻沙网在沙埋情况下的防风阻沙，采用不同叠加模式的尼龙阻沙网进行防护。设置3种高立式沙障叠加模式方案，叠加位置分别位于迎风坡、阻沙网、背风坡，迎风坡与背风坡叠加的尼龙阻沙网与原有阻沙障距离和长度均相同，叠加的阻沙网高度为沙埋原有阻沙障的一半，且叠加的尼龙阻沙网需高出原有尼龙阻沙障。选择高1.2 m的沙埋阻沙障进行叠加，迎风与背风坡叠加的位置距原有阻沙障水平距离约45 cm。通过野外观测发现：① 不同叠加模式的高立式沙障阻沙量不同，即阻沙网＞迎风坡＞背风坡；② 3种不同叠加模式的积沙量都随着阻沙网的不断叠加而增加，且增加的阻沙量越来越大；③ 随着阻沙网的不断叠加，3种不同叠加模式的单位阻沙成本不断变化。迎风坡与阻沙网模式的单位阻沙成本不断降低，最后趋于平稳；背风坡模式有所不同，其单位阻沙成本先有所增加，然后再下降，最终趋于平稳。阻沙成本为：阻沙网<迎风坡<背风坡。

Deposited-sand Volume of High Vertical Sand Barrier under Different Stacking Modes

In order to understand the nylon sand resistance nets for catching sand, the different stacking modes of nylon sand resistance nets were taken. In this study, three stacking modes of high vertical sand barriers were designed, and the stacking positions were designed separately on windward slope and leeward slope as well as at sand resistance nets. The distance between the stacked nylon sand resistance nets and the sand barriers and their length on both windward slope and leeward slope were the same, height of the nets was half of the sand barriers, and the stacked nylon sand resistance nets were higher than the nylon sand barriers. The sand barriers 1.2 m in height were selected to stack, and the stacking distance to the sand barriers was about 45 cm. The results are as follows: ① The deposited sand volume of the different stacking modes of high vertical sand barriers was different, and it was in an order of sand resistance nets>windward slope>leeward slope; ② The deposited sand volume of the three stacking modes was continuously increased with the increase of stacking sand resistance nets; ③ The sand resistance cost of the three stacking modes per unit volume was changed with the increase of stacking sand resistance nets: it was continuously decreased on windward slope and for sand resistance nets and stabilized finally; it was increased at first, then decreased and stabilized finally on leeward slope. The sand resistance cost per unit volume was in an order of resistance sand net