Journal
SUSTAINABILITY
Volume 14, Issue 9, Pages -Publisher
MDPI
DOI: 10.3390/su14095288
Keywords
fine mesh net; spoil deposits; erosion control; slope; rainfall intensity
Funding
- National Natural Science Foundation of China Project [41771308]
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Fine mesh nets (FMNs) are effective in reducing soil erosion in construction spoil deposits, especially in controlling sediment yield. The effectiveness of FMNs varies with rainfall intensity and slope gradients.
Fine mesh nets (FMNs) are commonly used as a mulch material to control soil erosion in construction spoil deposits. Here, three rainfall intensities (60-120 mm center dot h(-1)) and seven slope gradients (5-35 degrees) were considered in relation to an FMN's function of reducing soil erosion on spoil deposits. Soil surfaces covered with an FMN (NS) were prepared in 2 m x 0.5 m soil boxes, with a smooth surface (SS) as the control. Runoff and sediment reduction benefits (RRB and SRB, respectively) were used to quantify the role of the FMN in soil erosion reduction. The FMN performed better in controlling the total sediment yield (mean SRB: 35.9%) compared with total runoff (mean RRB: 5.3%). There was a difference in runoff between SS and NS under a low rainfall intensity (60 mm center dot h(-1); p < 0.05). SS and NS on different slopes generated similar runoff, with significantly different sediment yields (p < 0.05). The benefits of the FMN basically decreased with increases in the rainfall intensity and slope, although the RRB fluctuated on different slopes. The results demonstrate that the soil and water conservation benefits of the FMN on spoil deposits were influenced by the rainfall intensity and slope. The effectiveness of FMNs in soil erosion control needs further investigation in the context of local climates.
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