Abstract
Vegetative filter strips (VFSs) have been recommended as the best management practice for reducing runoff nonpoint source (NPS) pollution. The efficiency of VFSs located adjacent to water bodies can vary with shallow water table depths (WTD). A vegetated soil tank containing silt loam soil and Shortleaf Lilyturf vegetation was designed to study the effects of VFSs under shallow WTD (0.08, 0.22, and 0.36 m) on retentions of surface runoff, sediment, phosphorus, and bromide. Experiments were conducted with a simulated rainfall intensity of 28 mm h−1 and inflow rates of 4.02–4.56 L min−1. The results revealed that a deep WTD, low grass spacing, and low slope had high VFS retention efficiencies. The retention efficiencies varied greatly from 35%, 70%, 64%, and 55% at the 0.08-m WTD in the experimental group with high grass spacing (6.69 cm) and low slope (5%) to 96%, 98%, 96%, and 95% at the 0.36-m WTD in the experimental group with low grass spacing (4.18 cm) and low slope (5%) for surface runoff, sediment, phosphorus, and bromide, respectively. A steeper slope (at the same grass spacing) increased the effects of the WTD on VFS performance. For each experimental group, the average surface runoff outflow rate decreased with the WTD, whereas the average subsurface lateral flow rate increased. The transport of phosphorus in the surface runoff almost resembled that of bromide, and the average concentration (C/C0 Ave) of phosphorus and bromide decreased with the WTD. For the subsurface lateral flow, the transport of bromide and phosphorus exhibited typical breakthrough behaviors during each experiment, and both the normalized phosphorus and bromide concentrations in increasing limbs could be described by power equations. The high concentration of pollutants in the subsurface lateral flow may have affected the adjacent water bodies and groundwater. In quantification of the impact of WTD on effectiveness of VFS, we can effectively control the NPS pollutants in a watershed.
Article highlights
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VFS with deep WTD, low grass spacing, and low slope was beneficial for reducing NPS.
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At the same grass spacing, a steeper slope increased the effects of the WTD on VFS performance.
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The solute concentrations in increasing limbs can be described by power equations.
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Acknowledgements
Special thanks are given to Ke-ji Gao, Yan Li, and Xi Liu for their help in analyzing samples. This research was financially supported by the CRSRI Open Research Program (CKWV2018491/KY), the Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) (CUGCJ1704), and the China Geological Survey Project (12120114069301, 121201001000150121).
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Li, R., Kuo, YM. Effects of Shallow Water Table Depth on Vegetative Filter Strips Retarding Transport of Nonpoint Source Pollution in Controlled Flume Experiments. Int J Environ Res 15, 163–175 (2021). https://doi.org/10.1007/s41742-020-00305-x
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DOI: https://doi.org/10.1007/s41742-020-00305-x