Lateral distribution of sediment and phosphorus in a two-stage ditch with partial emergent vegetation on the floodplain

Bai, Yu; Chen, Qiuwen

doi:10.1007/s11356-019-06118-6

Cited by 13 publications

(4 citation statements)

References 85 publications

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“…Although reductions in P loads were predicted during inundation events (Bai and Zeng, 2019;D'Ambrosio et al, 2015;Krider et al, 2017) this was only observed in site S8. However, the lower number of water samples collected during these events limited the comparison between base flow and inundation conditions, highlighting the need for highresolution monitoring to resolve P responses to storm events.…”

Section: Influence Of Floodplain Designs On P Reductions In Streamsmentioning

confidence: 88%

“…Reductions in SS and P concentrations and loads along remediated streams with a two-stage design are argued to be driven by lateral distribution of sediments from the inset channel onto floodplains during higher flows (Fig. 1), based on monitoring studies (D'Ambrosio et al, 2015;Krider et al, 2017;Mahl et al, 2015) and flume experiments (Bai and Zeng, 2019). To date, studies on sediment delivery in remediated streams have solely relied on either geometric survey data or grab water sampling, with emphasis on investigating its potential for improving geomorphic stability.…”

Section: Introductionmentioning

confidence: 99%

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Phosphorus supply and floodplain design govern phosphorus reduction capacity in remediated agricultural streams

Hallberg,

Djodjic,

Bieroza

2024

Hydrol. Earth Syst. Sci.

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Abstract. Agricultural headwater streams are important pathways for diffuse sediment and nutrient losses, requiring mitigation strategies beyond in-field measures to intercept the transport of pollutants to downstream freshwater resources. As such, floodplains can be constructed along existing agricultural streams and ditches to improve fluvial stability and promote deposition of sediments and particulate phosphorus. In this study, we evaluated 10 remediated agricultural streams in Sweden for their capacity to reduce sediment and particulate phosphorus export and investigated the interplay between fluvial processes and phosphorus dynamics. Remediated streams with different floodplain designs (either on one side or both sides of the channel, with different width and elevation) were paired with upstream trapezoidal channels as controls. We used sedimentation plates to determine seasonal patterns in sediment deposition on channel beds and floodplains and monthly water quality monitoring. This was combined with continuous flow discharge measurements to examine suspended sediment and particulate phosphorus dynamics and reduction along reaches. Remediated streams with floodplains on both sides of the channel reduced particulate phosphorus concentrations and loads (−54 µg L−1, −0.21 kg ha−1 yr−1) along reaches, whereas increases occurred along streams with one-sided floodplains (27 µg L−1, 0.09 kg ha−1 yr−1) and control streams (46.6 µg L−1). Sediment deposition in remediated streams was five times higher on channel beds than on floodplains and there was no evident lateral distribution of sediments from channel to floodplains. There was no effect from sediment deposition on particulate phosphorus reduction, suggesting that bank stabilization was the key determinant for phosphorus mitigation in remediated streams, which can be realized with two-sided but not one-sided floodplains. Further, the overall narrow floodplain widths likely restricted reach-scale sediment deposition and its impact on P reductions. To fully understand remediated streams' potential for reductions in both nitrogen and different phosphorus species and to avoid pollution swapping effects, there is a need to further investigate how floodplain design can be optimized to achieve a holistic solution towards improved stream water quality.

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Section: Influence Of Floodplain Designs On P Reductions In Streamsmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

Phosphorus supply and floodplain design govern phosphorus reduction capacity in remediated agricultural streams

Hallberg,

Djodjic,

Bieroza

2024

Hydrol. Earth Syst. Sci.

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“…The flow parameters are shown in Table 1. In previous works (Wood & Liang 1989;Lin & Shiono 1995;Simoes & Wang 1997;Guan 2003;Farzadkhoo et al 2018;Gu et al 2018;Bai & Zeng 2019), the width of floodplain varied from 0.1 m to 2.5 m. Here, the width of the floodplain is 0.1 m, and its height is 10 cm. The width of the main channel is 30 cm.…”

Section: Experiments Setmentioning

confidence: 87%

The streamwise velocity distribution in a two-stage channel with ice cover

Bai

Sun

2021

Water Supply

Self Cite

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The problem of agricultural non-point source pollution has become increasingly serious. How to determine the ecological drainage ditch system is one of the effective methods to solve the agricultural non-point source pollution. This research study focuses on the velocity distribution in a two-stage section ecological channel with ice cover. The results show that the two-stage section channel with ice cover can effectively reduce the flow velocity in the channel and increase the retention time of water in the channel. By comparing with the experimental data, the accuracy of the analytical solution is high, which provides a theoretical reference for the transport of sediment and pollutions in a two-stage section channel with ice cover in the future.

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“…Furthermore, the sites within the two-stage ditch and the natural floodplain were characterized by generally low EPC 0 values independent of the hydrological events and sediment texture, indicating that the sediments had a generally higher adsorption potential at the other sites. The low EPC 0 at these sites can be explained by protection from lateral terrestrial inputs (for the two-stage ditch) and increased deposition of P-loaded sediments from upstream reaches on the floodplain areas (for both the two-stage ditch and the natural floodplain) during flooding [72,73]. In the post flood-sampling, EPC 0 showed the highest differences to water column SRP concentrations in the channelized sections, suggesting that eroded soil from the catchment presents the main P source for the Maltsch river.…”

Section: Effects Of the Two-stage Ditch And The Floodplain On Sediment Processesmentioning

confidence: 99%

Effects of Two-Stage Ditch and Natural Floodplains on Sediment Processes Driven by Different Hydrological Conditions

Baldan

Pucher

Akbari

et al. 2021

Water

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The two-stage ditch is a river restoration technique that aims at improving the sediment regime and lateral channel connectivity by recreating a small floodplain alongside a stream reach. This study aimed to analyze the efficiency of a two-stage ditch in improving the stream sediment structure and functions under different hydrological conditions (baseflow, post-bankfull, post-flood). Stream sediments were collected in channel sections adjacent to the two-stage ditch, adjacent to a natural floodplain along channelized reaches without inundation areas. Grain sizes, organic matter content and phosphorous (P) fractions were analyzed along with functional parameters (benthic respiration rate and P adsorption capacity, EPC0). The reach at the two-stage ditch showed no changes in sediment texture and stocks, while the floodplain reach showed higher fines and organic matter content under all hydrological conditions. The sediments in degraded reaches were more likely to be P sources, while they were more in equilibrium with the water column next to the natural floodplains and the two-stage ditch. Only functional parameters allowed for assessing the restoration effects on improving the sediment stability and functionality. Due to its sensitivity, the use of P adsorption capacity is recommended in future studies aiming at evaluating the response of river sediments to restoration measures under different hydrological conditions.

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Lateral distribution of sediment and phosphorus in a two-stage ditch with partial emergent vegetation on the floodplain

Cited by 13 publications

References 85 publications

Phosphorus supply and floodplain design govern phosphorus reduction capacity in remediated agricultural streams

Phosphorus supply and floodplain design govern phosphorus reduction capacity in remediated agricultural streams

The streamwise velocity distribution in a two-stage channel with ice cover

Effects of Two-Stage Ditch and Natural Floodplains on Sediment Processes Driven by Different Hydrological Conditions

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