Modelling Sediment Trapping by Non-Submerged Grass Buffer Strips Using Nonparametric Supervised Learning Technique

Akram, Sina

doi:10.3808/jei.201500291

Cited by 4 publications

(4 citation statements)

References 47 publications

(96 reference statements)

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“…Previous studies built models related to efficiency of buffer strips (e.g., Akram, Yu, Ghadiri, & Rose, ; De Baets et al, ; Siepel, Steenhuis, Rose, Parlange, & McIsaac, ; Zhao et al, ), whereas the runoff and erosion/deposition processes in buffer strips could be different due to different flow patterns and vegetation settings, leading to variation of buffer strip effects, influencing factors and their relationships.…”

Section: Discussionmentioning

confidence: 99%

Effects of vegetation buffer strips on concentrated flow hydraulics and gully bed erosion based on in situ scouring experiments

Dong

Xiong

et al. 2018

Land Degrad Dev

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Vegetation on gully beds could intercept runoff, reduce incision of gully bed, and trap sediment from upstream area. The aim of this study is to evaluate the influences of vegetation buffer strips on concentrated flow hydraulics and gully bed erosion downstream of gully headcuts. Five gully head plots containing different buffer strip widths with similar vegetation density were constructed for in situ scouring experiments. Each plot received 11 tests with 2 discharges (i.e., 7 tests simulating 83.3 L min−1 and 4 tests simulating 166.7 L min−1). Buffer strips clearly decrease flow hydraulics (about 56–70%) and increase flow resistance (1.2 to 1.5 times) according to the selected hydraulic parameters. After 11 tests, total net erosion volume (NEV) and average sediment concentration from each gully bed showed an exponential decreasing relationship with increasing widths of buffer strips. All the selected hydraulic parameters showed a strong correlation with total NEV from the bare soil sections (0.43 < R2 < .61 with significance level reaching .01), whereas the relationship was very weak in the buffer strips. The gross deposition volume in buffer strips showed a linear correlation with upstream NEV (NEVu) and flow velocity (R2 = .91, p < .001). Split flow effects expressed by braid index increased with increasing widths of buffer strips and scouring times. Both bare and vegetated sections suffered from erosion clearly, but the average NEV from buffer strips was about 30.2% of bare soil sections. This indicated the buffer strip effects on reducing erosion were more significant than trapping sediments were in this study.

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Section: Discussionmentioning

confidence: 99%

Effects of vegetation buffer strips on concentrated flow hydraulics and gully bed erosion based on in situ scouring experiments

Dong

Xiong

et al. 2018

Land Degrad Dev

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“…Machine-learning algorithms have also been used to predict the efficiency of grass buffer strips in reducing sediment delivery in several models (Andriyas et al, 2003;Akram et al, 2016). Although statistical models can be useful mostly as decision support tools, they do not simulate the processes involved in the hydrological events.…”

Section: Introductionmentioning

confidence: 99%

Application of GUSED‐VBS 2 Model for Flow and Sediment Transport in Vegetated Strips to Improve Water Quality

Akram

2017

Irrigation and Drainage

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Vegetated buffer strips change flow hydrology and sediment transport by increasing resistance to the flow and intensifying infiltration. GUSED‐VBS 2 is a process‐based mathematical model developed to simulate flow characteristics and the fate and transport of sediment in the backwater region upstream of vegetated strips and within them. The model also predicts the concentration and delivery of different particle sizes leaving the vegetated strips and reaching open water bodies. GUSED‐VBS 2 assumes that entrainment and deposition processes occur simultaneously and uses the Green–Ampt approach to simulate infiltration and gradually varied flow and kinematic wave approximation to simulate the water profile in the backwater region and within the vegetated strip respectively. The modified GUEST model approach was used to model the fate and transport of sediment in vegetated strips. Field data were used to evaluate the model predictions of the efficiency of vegetated strips in reducing runoff, sediment concentration and sediment delivery, and the results showed that GUSED‐VBS 2 performed much better in controlled conditions compared to field conditions. The performance of the GUSED‐VBS 2 and WEPP models in simulating particle size distribution in the outflow was compared with different model evaluation criteria and GUSED‐VBS 2 showed better performance compared to WEPP. Copyright © 2017 John Wiley & Sons, Ltd.

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“…where SC(t) and Q(t) are the sediment concentration (g L −1 ) and flow rate (L min −1 ), respectively, at time t (min). The ISTE of a grass strip Ie(t) is usually used to indicate the real-time sediment-trapping performance of the grass strip over time [10,11].…”

Section: Measurement and Data Analysis 221 Sediment Process Calculationsmentioning

confidence: 99%

“…The sediment-trapping effect of a grass strip is often simply described using an overall sediment-trapping efficiency for a certain period [8], but this does not indicate temporal variations in sediment trapping by the grass strip [9]. The instantaneous sediment-trapping efficiency (ISTE) of a grass strip is usually used to indicate the real-time sediment-trapping performance of a grass strip [10,11]. The ISTE will change mainly because deposited sediment will affect the roughness of the grassland and the resistance of the grassland to overland flow [7,12].…”

Section: Introductionmentioning

confidence: 99%

Effects of Different Aboveground Structural Parts of Grass Strips on the Sediment-Trapping Process

et al. 2021

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Grass strips can decrease erosion, trap sediment in silt-laden water flowing downhill, and control nonpoint source pollution. Determining the effects of different parts of grass strips on silt-laden overland flow will improve our understanding of sediment trapping by grass strips with different structures. Sediment trapping by grass strips was studied using a 5° slope, 30 L min−1 m−1 flow rate, 120 g L−1 sediment concentration, and different aboveground components of grass strips (complete grass, removed green grass, and removed green and withered grass). The whole overland flow process was monitored. Meanwhile, the runoff sediment samples at the outlet were collected and measured. Sediment trapping by aboveground grass parts was quantified at different stages. Of the soil bed surface, green grass, and withered grass, the soil bed surface dominated sediment trapping in the initial stage of the sediment-trapping process, contributing about 90% of total sediment deposition in the first 5 min. As the sediment-trapping process continued, the effect of the soil bed surface weakened, and the green grass played a major role at the later stage of sediment trapping. The ratio of the soil bed surface, green grass, and withered grass contributions to total sediment deposition at the stable stage of the experiments was approximately 3:5:2. The results will help assess the effects of vegetation restoration on sediment transport in entire watersheds.

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Modelling Sediment Trapping by Non-Submerged Grass Buffer Strips Using Nonparametric Supervised Learning Technique

Cited by 4 publications

References 47 publications

Effects of vegetation buffer strips on concentrated flow hydraulics and gully bed erosion based on in situ scouring experiments

Effects of vegetation buffer strips on concentrated flow hydraulics and gully bed erosion based on in situ scouring experiments

Application of GUSED‐VBS 2 Model for Flow and Sediment Transport in Vegetated Strips to Improve Water Quality

Effects of Different Aboveground Structural Parts of Grass Strips on the Sediment-Trapping Process

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