The Experts below are selected from a list of 327 Experts worldwide ranked by ideXlab platform

R J Hardy - One of the best experts on this subject based on the ideXlab platform.

  • interactions between sediment Delivery Channel change climate change and flood risk in a temperate upland environment
    Earth Surface Processes and Landforms, 2007
    Co-Authors: Stuart N Lane, V Tayefi, Simon C Reid, Dapeng Yu, R J Hardy
    Abstract:

    This paper uses numerical simulation of flood inundation based on a coupled one-dimensional–two-dimensional treatment to explore the impacts upon flood extent of both long-term climate changes, predicted to the 2050s and 2080s, and short-term river Channel changes in response to sediment Delivery, for a temperate upland gravel-bed river. Results show that 16 months of measured in-Channel sedimentation in an upland gravel-bed river cause about half of the increase in inundation extent that was simulated to arise from climate change. Consideration of the joint impacts of climate change and sedimentation emphasized the non-linear nature of system response, and the possibly severe and synergistic effects that come from combined direct effects of climate change and sediment Delivery. Such effects are likely to be exacerbated further as a result of the impacts of climate change upon coarse sediment Delivery. In generic terms, these processes are commonly overlooked in flood risk mapping exercises and are likely to be important in any river system where there are high rates of sediment Delivery and long-term transfer of sediment to floodplain storage (i.e. alluviation involving active Channel aggradation and migration). Similarly, attempts to reduce Channel migration through river bank stabilization are likely to exacerbate this process as without bank erosion, Channel capacity cannot be maintained. Finally, many flood risk mapping studies rely upon calibration based upon combining contemporary bed surveys with historical flood outlines, and this will lead to underestimation of the magnitude and frequency of floodplain inundation in an aggrading system for a flood of a given magnitude. Copyright © 2006 John Wiley & Sons, Ltd.

  • interactions between sediment Delivery Channel change climate change and flood risk in a temperate upland environment
    Earth Surface Processes and Landforms, 2007
    Co-Authors: Stuart N Lane, V Tayefi, Simon C Reid, R J Hardy
    Abstract:

    This paper uses numerical simulation of flood inundation based on a coupled one-dimensional-two-dimensional treatment to explore the impacts upon flood extent of both long-term climate changes, predicted to the 2050s and 2080s, and short-term river Channel changes in response to sediment Delivery, for a temperate upland gravel-bed river. Results show that 16 months of measured in-Channel sedimentation in an upland gravel-bed river cause about half of the increase in inundation extent that was simulated to arise from climate change. Consideration of the joint impacts of climate change and sedimentation emphasized the non-linear nature of system response, and the possibly severe and synergistic effects that come from combined direct effects of climate change and sediment Delivery. Such effects are likely to be exacerbated further as a result of the impacts of climate change upon coarse sediment Delivery. In generic terms, these processes are commonly overlooked in flood risk mapping exercises and are likely to be important in any river system where there are high rates of sediment Delivery and long-term transfer of sediment to floodplain storage (i.e. alluviation involving active Channel aggradation and migration). Similarly, attempts to reduce Channel migration through river bank stabilization are likely to exacerbate this process as without bank erosion, Channel capacity cannot be maintained. Finally, many flood risk mapping studies rely upon calibration based upon combining contemporary bed surveys with historical flood outlines, and this will lead to underestimation of the magnitude and frequency of floodplain inundation in an aggrading system for a flood of a given magnitude.

Tim D Fletcher - One of the best experts on this subject based on the ideXlab platform.

  • A suburban sediment budget: Coarse‐grained sediment flux through hillslopes, stormwater systems and streams
    Earth Surface Processes and Landforms, 2019
    Co-Authors: Kathryn L. Russell, Gj Vietz, Tim D Fletcher
    Abstract:

    Sediment in urban stormwater systems creates a significant maintenance burden, while a lack of coarse‐grained bed sediment in streams limits their ecological value and geomorphic resilience. Gravel substrates, for example, provide benthic habitat yet are often scoured from the Channel bed only to end up in a detention basin or treatment wetland. This dual problem of both ‘too much’ and ‘too little’ coarse‐grained sediment reflects a watershed sediment budget that is profoundly altered. We developed a conceptual urban coarse‐grained (>0.5 mm) sediment budget across three domains: hillslopes (urban land surfaces), the built stormwater network and stream Channels. We then quantified key sources, sinks and storages for a suburban case study, using a combination of hillslope and in‐Channel monitoring, and interrogation of local government records. Around 36% of the sediment supplied to the stormwater network reached the catchment outlet, a level of sediment Delivery much higher than observed in similar‐sized natural catchments. The remainder was deposited in the sediment cascade and either stored, or extracted and removed from the catchment (e.g. material deposited in sediment ponds and gross pollutant traps). Conventional urban drainage networks are characterized by high hillslope sediment supply and low storage, resulting in efficient sediment Delivery. Channel erosion, deposition in (and extraction from) pipes and Channels, and floodplain deposition are small compared to sediment transport through the cascade. An understanding of the sediment budget of urban headwater catchments can provide stormwater and waterway managers with the information they need to address specific sediment problems such as sedimentation in stormwater assets and geomorphic recovery of urban streams.

Stuart N Lane - One of the best experts on this subject based on the ideXlab platform.

  • interactions between sediment Delivery Channel change climate change and flood risk in a temperate upland environment
    Earth Surface Processes and Landforms, 2007
    Co-Authors: Stuart N Lane, V Tayefi, Simon C Reid, Dapeng Yu, R J Hardy
    Abstract:

    This paper uses numerical simulation of flood inundation based on a coupled one-dimensional–two-dimensional treatment to explore the impacts upon flood extent of both long-term climate changes, predicted to the 2050s and 2080s, and short-term river Channel changes in response to sediment Delivery, for a temperate upland gravel-bed river. Results show that 16 months of measured in-Channel sedimentation in an upland gravel-bed river cause about half of the increase in inundation extent that was simulated to arise from climate change. Consideration of the joint impacts of climate change and sedimentation emphasized the non-linear nature of system response, and the possibly severe and synergistic effects that come from combined direct effects of climate change and sediment Delivery. Such effects are likely to be exacerbated further as a result of the impacts of climate change upon coarse sediment Delivery. In generic terms, these processes are commonly overlooked in flood risk mapping exercises and are likely to be important in any river system where there are high rates of sediment Delivery and long-term transfer of sediment to floodplain storage (i.e. alluviation involving active Channel aggradation and migration). Similarly, attempts to reduce Channel migration through river bank stabilization are likely to exacerbate this process as without bank erosion, Channel capacity cannot be maintained. Finally, many flood risk mapping studies rely upon calibration based upon combining contemporary bed surveys with historical flood outlines, and this will lead to underestimation of the magnitude and frequency of floodplain inundation in an aggrading system for a flood of a given magnitude. Copyright © 2006 John Wiley & Sons, Ltd.

  • interactions between sediment Delivery Channel change climate change and flood risk in a temperate upland environment
    Earth Surface Processes and Landforms, 2007
    Co-Authors: Stuart N Lane, V Tayefi, Simon C Reid, R J Hardy
    Abstract:

    This paper uses numerical simulation of flood inundation based on a coupled one-dimensional-two-dimensional treatment to explore the impacts upon flood extent of both long-term climate changes, predicted to the 2050s and 2080s, and short-term river Channel changes in response to sediment Delivery, for a temperate upland gravel-bed river. Results show that 16 months of measured in-Channel sedimentation in an upland gravel-bed river cause about half of the increase in inundation extent that was simulated to arise from climate change. Consideration of the joint impacts of climate change and sedimentation emphasized the non-linear nature of system response, and the possibly severe and synergistic effects that come from combined direct effects of climate change and sediment Delivery. Such effects are likely to be exacerbated further as a result of the impacts of climate change upon coarse sediment Delivery. In generic terms, these processes are commonly overlooked in flood risk mapping exercises and are likely to be important in any river system where there are high rates of sediment Delivery and long-term transfer of sediment to floodplain storage (i.e. alluviation involving active Channel aggradation and migration). Similarly, attempts to reduce Channel migration through river bank stabilization are likely to exacerbate this process as without bank erosion, Channel capacity cannot be maintained. Finally, many flood risk mapping studies rely upon calibration based upon combining contemporary bed surveys with historical flood outlines, and this will lead to underestimation of the magnitude and frequency of floodplain inundation in an aggrading system for a flood of a given magnitude.

Kathryn L. Russell - One of the best experts on this subject based on the ideXlab platform.

  • A suburban sediment budget: Coarse‐grained sediment flux through hillslopes, stormwater systems and streams
    Earth Surface Processes and Landforms, 2019
    Co-Authors: Kathryn L. Russell, Gj Vietz, Tim D Fletcher
    Abstract:

    Sediment in urban stormwater systems creates a significant maintenance burden, while a lack of coarse‐grained bed sediment in streams limits their ecological value and geomorphic resilience. Gravel substrates, for example, provide benthic habitat yet are often scoured from the Channel bed only to end up in a detention basin or treatment wetland. This dual problem of both ‘too much’ and ‘too little’ coarse‐grained sediment reflects a watershed sediment budget that is profoundly altered. We developed a conceptual urban coarse‐grained (>0.5 mm) sediment budget across three domains: hillslopes (urban land surfaces), the built stormwater network and stream Channels. We then quantified key sources, sinks and storages for a suburban case study, using a combination of hillslope and in‐Channel monitoring, and interrogation of local government records. Around 36% of the sediment supplied to the stormwater network reached the catchment outlet, a level of sediment Delivery much higher than observed in similar‐sized natural catchments. The remainder was deposited in the sediment cascade and either stored, or extracted and removed from the catchment (e.g. material deposited in sediment ponds and gross pollutant traps). Conventional urban drainage networks are characterized by high hillslope sediment supply and low storage, resulting in efficient sediment Delivery. Channel erosion, deposition in (and extraction from) pipes and Channels, and floodplain deposition are small compared to sediment transport through the cascade. An understanding of the sediment budget of urban headwater catchments can provide stormwater and waterway managers with the information they need to address specific sediment problems such as sedimentation in stormwater assets and geomorphic recovery of urban streams.

Gj Vietz - One of the best experts on this subject based on the ideXlab platform.

  • A suburban sediment budget: Coarse-grained sediment flux through hillslopes, stormwater systems and streams
    'Wiley', 2019
    Co-Authors: Kl Russell, Gj Vietz, Td Fletcher
    Abstract:

    Sediment in urban stormwater systems creates a significant maintenance burden, while a lack of coarse‐grained bed sediment in streams limits their ecological value and geomorphic resilience. Gravel substrates, for example, provide benthic habitat yet are often scoured from the Channel bed only to end up in a detention basin or treatment wetland. This dual problem of both ‘too much’ and ‘too little’ coarse‐grained sediment reflects a watershed sediment budget that is profoundly altered. We developed a conceptual urban coarse‐grained (>0.5 mm) sediment budget across three domains: hillslopes (urban land surfaces), the built stormwater network and stream Channels. We then quantified key sources, sinks and storages for a suburban case study, using a combination of hillslope and in‐Channel monitoring, and interrogation of local government records. Around 36% of the sediment supplied to the stormwater network reached the catchment outlet, a level of sediment Delivery much higher than observed in similar‐sized natural catchments. The remainder was deposited in the sediment cascade and either stored, or extracted and removed from the catchment (e.g. material deposited in sediment ponds and gross pollutant traps). Conventional urban drainage networks are characterized by high hillslope sediment supply and low storage, resulting in efficient sediment Delivery. Channel erosion, deposition in (and extraction from) pipes and Channels, and floodplain deposition are small compared to sediment transport through the cascade. An understanding of the sediment budget of urban headwater catchments can provide stormwater and waterway managers with the information they need to address specific sediment problems such as sedimentation in stormwater assets and geomorphic recovery of urban streams

  • A suburban sediment budget: Coarse‐grained sediment flux through hillslopes, stormwater systems and streams
    Earth Surface Processes and Landforms, 2019
    Co-Authors: Kathryn L. Russell, Gj Vietz, Tim D Fletcher
    Abstract:

    Sediment in urban stormwater systems creates a significant maintenance burden, while a lack of coarse‐grained bed sediment in streams limits their ecological value and geomorphic resilience. Gravel substrates, for example, provide benthic habitat yet are often scoured from the Channel bed only to end up in a detention basin or treatment wetland. This dual problem of both ‘too much’ and ‘too little’ coarse‐grained sediment reflects a watershed sediment budget that is profoundly altered. We developed a conceptual urban coarse‐grained (>0.5 mm) sediment budget across three domains: hillslopes (urban land surfaces), the built stormwater network and stream Channels. We then quantified key sources, sinks and storages for a suburban case study, using a combination of hillslope and in‐Channel monitoring, and interrogation of local government records. Around 36% of the sediment supplied to the stormwater network reached the catchment outlet, a level of sediment Delivery much higher than observed in similar‐sized natural catchments. The remainder was deposited in the sediment cascade and either stored, or extracted and removed from the catchment (e.g. material deposited in sediment ponds and gross pollutant traps). Conventional urban drainage networks are characterized by high hillslope sediment supply and low storage, resulting in efficient sediment Delivery. Channel erosion, deposition in (and extraction from) pipes and Channels, and floodplain deposition are small compared to sediment transport through the cascade. An understanding of the sediment budget of urban headwater catchments can provide stormwater and waterway managers with the information they need to address specific sediment problems such as sedimentation in stormwater assets and geomorphic recovery of urban streams.