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

Bai, Yu; Sun, Guojin

doi:10.2166/ws.2021.225

Cited by 5 publications

(3 citation statements)

References 45 publications

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“…Setelah adanya penambahan gully plug pada penampang rencana maka terjadi penurunan kecepatan aliran (Velocity Channel) (Greenwood et al, 2019;Kandel et al, 2016;Liu & Nepf, 2016;Lu et al, 2020) pada alur 5 sungai Pulisan. Ukuran dimensi dari gully plug dapat berpengaruh terhadap kecepatan aliran yang akan terjadi (Bai & Sun, 2022;Esquivel et al, 2015). Hasil resume kecepatan berdasarkan tipe gully plug pada penampang rencana pada tabel 11 dan grafik perbandingan kecepatan aliran berdasarkan tipe gully plug pada penampang rencana pada gambar 7.…”

Section: Metodeunclassified

Kajian Efektifitas Gully Plug Dalam Pengendalian Run Off Di Kawasan Hulu Das Pulisan

Haryono Auwyanto,

Mananoma,

S. F. Sumarauw

2023

EDUSAINTEK

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The flood problem in Pulisan village that occurred in 2019 is one of the problems that needs to be addressed immediately because it causes losses to residents living around the river, and disrupts vehicle traffic. One of the causes of flooding in the Pulisan river is the magnitude of the run off and the large flow rate so that potential flooding events can occur. Therefore, run-off control is needed in the upstream area of the Pulisan river. Pulisan watershed has a total watershed area of 3.25 km2 and has 9 tributary channels. The location reviewed is in the Pulisan river channel with selected sections is the channel of 5 Pulisan rivers which has a watershed area of 0.2512 Km2. The Araren-Pigrandma MRG rain post and the Maen Climatology rain post are sources of maximum daily rainfall data used with a time span of 2002 to 2021. HEC-HMS software is used to obtain the parameters needed to obtain a peak discharge of 2.2 m3 / second and a planned flood discharge. HEC-RAS software to analyze water level and flow rate when using gully plug. The simulation results show that from several types of gully plugs, a significant reduction in flow speed is in type 60 gully plugs, namely the flow speed to 0.6 – 1 m / second, the flow speed does not cause deposits in the channel.

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Section: Metodeunclassified

Kajian Efektifitas Gully Plug Dalam Pengendalian Run Off Di Kawasan Hulu Das Pulisan

Haryono Auwyanto,

Mananoma,

S. F. Sumarauw

2023

EDUSAINTEK

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“…As a further limitation and source of uncertainty, an experimentally obtained annual to longer term mass balance for SS or nutrients is available for only a few sites, while the processes in the low-flow channel are typically not well taken into account in the investigations (e.g., [39]). Overall, the effect of TSCs and other NBS or management actions on water quality are not fully understood in Boreal channels where the cycling of P and N can notably differ from warmer climates due to freeze-thaw cycles [66], the influence of the ice cover on flow and transport of both soluble and particulate compounds [67], and the uncertainty regarding the efficiency of microbial transform processes at low temperatures [68].…”

Section: Benefits Of Two-stage Channels In Comparison To Conventional Dredgingmentioning

confidence: 99%

Agricultural Water Management Using Two-Stage Channels: Performance and Policy Recommendations Based on Northern European Experiences

et al. 2021

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Conventional dredging of ditches and streams to ensure agricultural drainage and flood mitigation can have severe environmental impacts. The aim of this paper is to investigate the potential benefits of an alternative, nature-based two-stage channel (TSC) design with floodplains excavated along the main channel. Through a literature survey, investigations at Finnish field sites and expert interviews, we assessed the performance, costs, and monetary environmental benefits of TSCs in comparison to conventional dredging, as well as the bottlenecks in their financing and governance. We found evidence supporting the expected longer-term functioning of drainage as well as larger plant and fish biodiversity in TSCs compared to conventional dredging. The TSC design likely improves water quality since the floodplains retain suspended sediment and phosphorus and remove nitrogen. In the investigated case, the additional value of phosphorus retention and conservation of protected species through the TSC design was 2.4 times higher than the total costs. We demonstrate how TSCs can be made eligible for the obligatory vegetated riparian buffer of the European Union agri-environmental subsidy scheme (CAP-AES) by optimising their spatial application with respect to other buffer measures, and recommend to publicly finance their additional costs compared to conventional dredging at priority sites. Further studies on biodiversity impacts and long-term performance of two-stage channels are required.

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“…In contrast to those produced by submerged and emergent vegetation, the hydrodynamic conditions produced by floating vegetation obviously differ (Figure 1). Floating vegetation can be regarded as the upper boundary of the river, and the vertical velocities at the middle of the river are high and low in the top and bottom layers, respectively (Bai et al 2020;Bai & Sun 2022). Second, floating vegetation can cover the water surface.…”

Section: Introductionmentioning

confidence: 99%

Research on bubbles and dissolved oxygen transfer in floating vegetated channels

Zhao,

Sun,

Bai

2024

Hydrology Research

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With river water quality deterioration in recent years, an increasing number of river water quality control studies have been conducted. Among relevant methods, aeration and vegetation planting are effective techniques. The combination of aeration and vegetation can improve the purification effect on the water quality. Based on flume experiments, the mass transfer coefficient of dissolved oxygen in rivers with floating vegetation patches of different diameters under hydrodynamics was studied. Large-diameter floating vegetation can effectively reduce the breaking of bubbles and increase the mass transfer coefficient of dissolved oxygen in rivers. According to mechanism analysis, a model of the oxygen mass transfer coefficient in floating vegetated channels was proposed, and a favorable simulation effect was obtained. This type of research could provide a theoretical basis for selecting and arranging vegetation in aeration floating vegetated channels.

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

Cited by 5 publications

References 45 publications

Kajian Efektifitas Gully Plug Dalam Pengendalian Run Off Di Kawasan Hulu Das Pulisan

Kajian Efektifitas Gully Plug Dalam Pengendalian Run Off Di Kawasan Hulu Das Pulisan

Agricultural Water Management Using Two-Stage Channels: Performance and Policy Recommendations Based on Northern European Experiences

Research on bubbles and dissolved oxygen transfer in floating vegetated channels

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