Degradation downstream from a sluice gate; variation of bed and sediment characteristics with time and discharge

Khaleel, Moayad S.; Othman, Khalil I.

doi:10.1016/s0022-1694(95)02979-6

Cited by 3 publications

(4 citation statements)

References 6 publications

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“…For the adults and larger juvenile fishes these migrations are likely to be active movements, but passive for drifting eggs and partly passive for larvae and young fry . Sluices can be responsible for degradation of downstream habitats by changing bed and sediment characteristics (Khaleel & Othman, 1997), and affect migration of fishes (Gardner, Rees-Jones, Morris, Bryant, & Lucas, 2016;Harris et al, 2017). Flow regulation can also affect the types of natural food production including plankton abundance and composition, and this is the main food for newly hatched and juvenile floodplain fish (Gozdziejewska et al, 2016;Havel, Eisenbacher, & Black, 2000;Pithart et al, 2007).…”

Section: Fish Diversity Abundance and Conservationmentioning

confidence: 99%

“…A large number (4190) of sluice gates and associated flood control infrastructure have been built in the last few decades in different rivers of Bangladesh to enhance rice production and also to protect property by controlling floodwater during the rainy season (Ali & Alam, 2005;Halls et al, 1999;Shankar, Halls, & Barr, 2004). However, water regulatory structures are responsible for modifying or fragmenting habitats (Jutagate, Krudpan, Ngamsnae, Lamkom, & Payooha, 2005;Khaleel & Othman, 1997;Nilsson et al, 2005) and However, water regulatory structures are responsible for modifying or fragmenting habitats (Jutagate, Krudpan, Ngamsnae, Lamkom, & Payooha, 2005;Khaleel & Othman, 1997;Nilsson et al, 2005) and…”

mentioning

confidence: 99%

“…The timing, extent and duration of floodplain inundation drives production in floodplain ecosystems and in associated fisheries (De Graaf, 2003;Junk, Bayley, & Sparks, 1989;Welcomme, 1979). However, water regulatory structures are responsible for modifying or fragmenting habitats (Jutagate, Krudpan, Ngamsnae, Lamkom, & Payooha, 2005;Khaleel & Othman, 1997;Nilsson et al, 2005) and can significantly affect aquatic biodiversity (Lucas, Bubb, Jang, Ha, & Masters, 2009;Marttin & De Graaf, 2002;Richter, Braun, Mendelson, & Master, 1997).…”

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confidence: 99%

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Is current floodplain management a cause for concern for fish and bird conservation in Bangladesh's largest wetland?

Galib

Lucas

Chaki

et al. 2018

Aquatic Conservation

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1. Worldwide, water regulatory structures have impacts on aquatic ecological connectivity. This study determined the effects of current sluice management on the fish community in the Baral River, a major connection to the largest wetland (Chalan Beel) in Bangladesh. It also examines wider problems for biodiversity conservation (particularly waterbirds) in that wetland, which has shrunk to 30% of its former dry-season size in 50 years. 2. During the flood period, the peak breeding time for native floodplain fishes, sluices were in undershot operation (open by 16-60% of water depth). During this time, fish abundance and species richness were 229% and 155% higher respectively at sites upstream of the sluices, despite similar habitat upstream and downstream. Outside this period, when sluices were fully open, abundance and species richness were similar upstream and downstream. 3. Fish samples were dominated by fry, which are susceptible to damage by sluices. Twenty (41.7%) of 48 fish species captured in this study are classed as threatened in Bangladesh and their abundance was significantly lower downstream of the sluices. Two alien species, Aristichthys nobilis and Hypophthalmichthys molitrix, were recorded, probably escapees from local aquaculture activities.4. Twenty-five species of wetland birds were recorded in the Chalan Beel. From interviews, 64% of these species appear to have decreased in the last 20 years, together with 11 more species that may have become locally extinct over this period. This suggests that widespread ecological disruption is occurring. 5. Improved water management (e.g. gate opening height and duration) or modification (e.g. fish pass) of the Baral sluices is needed, to meet biodiversity and fisheries needs, rather than just for flood control and crop production. Improved hydrological and ecological connectivity and habitat protection are needed, as are a cessation of destructive fishing and seasonal fish ranching practices that currently provide synergistic pressures.

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Section: Fish Diversity Abundance and Conservationmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Is current floodplain management a cause for concern for fish and bird conservation in Bangladesh's largest wetland?

Galib

Lucas

Chaki

et al. 2018

Aquatic Conservation

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“…Gates have been extensively used in irrigation canals, at the top of the spillway of dams, and at transitions between lakes and channels [2, 3], among others. Khaleel and Othman [4] studied clear water released from a sluice gate and its impact on a downstream alluvial laboratory channel.…”

Section: Introduction 11 Literature Reviewmentioning

confidence: 99%

Hydraulic Performance of Sluice Gates: A Review of Head Loss Estimation and Discharge Coefficients for Optimal Flow Control and Design Considerations

Salmasi,

Abraham

2023

Environmental Sciences

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Sluice gates are commonly used water management structures; they are able to deliver flow among both major and minor channels. When used for these operations, they are sometimes referred to as intake structures. These structures can be employed at the dam crest for controlling downstream flow. Irrespective of their simple structures, the hydraulics of sluice gates are complex. Sluice gates are used in various applications, from practical applications such as irrigation channels to research activities in universities. Accurate head loss calculations (ΔE) and discharge coefficients (Cd) are essential for the design of open canals. Calculations are needed for both free or submerged flow conditions. Although there have been some investigations on Cd for sluice gates, a comprehensive literature review shows that there are no studies on ΔE. Knowledge of ΔE is necessary for the design of intakes and irrigation canal inverts. The objective of this study is to investigate the head loss estimation and discharge coefficients for optimal flow control and design considerations. Both the vertical sluice gate and radial gate are investigated. This study experimentally explores ΔE and Cd using geometric scaling. It is found that ΔE for free flow exceeds that of submerged flow. In addition, free flow discharge coefficients exceed those for submerged flow. Relative energy losses (ΔE) range from 0.271 to 0.604. Energy losses of these magnitudes cannot be ignored, and their impact on minor canal inverts should be considered.

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Prediction of discharge coefficients for sluice gates equipped with different geometric sills under the gate using multiple non-linear regression (MNLR)

Salmasi

Abraham

2021

Journal of Hydrology

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Degradation downstream from a sluice gate; variation of bed and sediment characteristics with time and discharge

Cited by 3 publications

References 6 publications

Is current floodplain management a cause for concern for fish and bird conservation in Bangladesh's largest wetland?

Is current floodplain management a cause for concern for fish and bird conservation in Bangladesh's largest wetland?

Hydraulic Performance of Sluice Gates: A Review of Head Loss Estimation and Discharge Coefficients for Optimal Flow Control and Design Considerations

Prediction of discharge coefficients for sluice gates equipped with different geometric sills under the gate using multiple non-linear regression (MNLR)

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