Author: E. H. Grissinger
Publisher:
ISBN:
Category : Geomorphology
Languages : en
Pages : 116
Book Description
This process-oriented study was organized to investigate three complementary aspects of channel stability including: (a) the nature of channel failure processes; (b) the influences of valley-fill depositional units on these processes; and (c) the properties and distributions of the valley-fill units. The study included the near-surface geologic investigation, investigation of the late-Quaternary valley-fill deposits, and channel morphometric investigations. The properties and distributions of the valley-fill units directly and indirectly influence the nature of channel failure processes. Although gravity-induced failure is the most frequent form of present-day bank instability, the type of gravity failure is dependent upon the properties of the valley-fill units. Both depositional and weathering properties influence the type of failure. The valley-fill units indirectly influence bank stability through their control of groundwater movement and the development of unusually large seepage forces at point-locations along the channels. Bed instability has primarily resulted from upstream migration of knickpoints and the rate of knickpoint migration has been affected by (valley-fill) unit controls. Present drainage systems in the study area are immature; channel morphometry has not adjusted at this time to the new flow regime resultant from cultural and natural changes.
Stream Channel Stability
Author: E. H. Grissinger
Publisher:
ISBN:
Category : Geomorphology
Languages : en
Pages : 116
Book Description
This process-oriented study was organized to investigate three complementary aspects of channel stability including: (a) the nature of channel failure processes; (b) the influences of valley-fill depositional units on these processes; and (c) the properties and distributions of the valley-fill units. The study included the near-surface geologic investigation, investigation of the late-Quaternary valley-fill deposits, and channel morphometric investigations. The properties and distributions of the valley-fill units directly and indirectly influence the nature of channel failure processes. Although gravity-induced failure is the most frequent form of present-day bank instability, the type of gravity failure is dependent upon the properties of the valley-fill units. Both depositional and weathering properties influence the type of failure. The valley-fill units indirectly influence bank stability through their control of groundwater movement and the development of unusually large seepage forces at point-locations along the channels. Bed instability has primarily resulted from upstream migration of knickpoints and the rate of knickpoint migration has been affected by (valley-fill) unit controls. Present drainage systems in the study area are immature; channel morphometry has not adjusted at this time to the new flow regime resultant from cultural and natural changes.
Publisher:
ISBN:
Category : Geomorphology
Languages : en
Pages : 116
Book Description
This process-oriented study was organized to investigate three complementary aspects of channel stability including: (a) the nature of channel failure processes; (b) the influences of valley-fill depositional units on these processes; and (c) the properties and distributions of the valley-fill units. The study included the near-surface geologic investigation, investigation of the late-Quaternary valley-fill deposits, and channel morphometric investigations. The properties and distributions of the valley-fill units directly and indirectly influence the nature of channel failure processes. Although gravity-induced failure is the most frequent form of present-day bank instability, the type of gravity failure is dependent upon the properties of the valley-fill units. Both depositional and weathering properties influence the type of failure. The valley-fill units indirectly influence bank stability through their control of groundwater movement and the development of unusually large seepage forces at point-locations along the channels. Bed instability has primarily resulted from upstream migration of knickpoints and the rate of knickpoint migration has been affected by (valley-fill) unit controls. Present drainage systems in the study area are immature; channel morphometry has not adjusted at this time to the new flow regime resultant from cultural and natural changes.
Stream Channel Stability
Author: W. C. Little
Publisher:
ISBN:
Category : Stream channelization
Languages : en
Pages : 346
Book Description
Publisher:
ISBN:
Category : Stream channelization
Languages : en
Pages : 346
Book Description
Stream Channel Stability
Author: E. H. Grissinger
Publisher:
ISBN:
Category : Channels (Hydraulic engineering)
Languages : en
Pages : 112
Book Description
Publisher:
ISBN:
Category : Channels (Hydraulic engineering)
Languages : en
Pages : 112
Book Description
Stream Channel Stability
Author: Colin R. Thorne
Publisher:
ISBN:
Category : Sediment transport
Languages : en
Pages : 262
Book Description
Publisher:
ISBN:
Category : Sediment transport
Languages : en
Pages : 262
Book Description
Stream Channel Stability
Author: E. H. Seely
Publisher:
ISBN:
Category : Automatic data collection systems
Languages : en
Pages : 50
Book Description
Publisher:
ISBN:
Category : Automatic data collection systems
Languages : en
Pages : 50
Book Description
Stream Channel Stability
Author: D. G. DeCoursey
Publisher:
ISBN:
Category : Sediment transport
Languages : en
Pages : 232
Book Description
Publisher:
ISBN:
Category : Sediment transport
Languages : en
Pages : 232
Book Description
Stream Channel Stability
Author: W. C. Little
Publisher:
ISBN:
Category : Stream channelization
Languages : en
Pages : 48
Book Description
Publisher:
ISBN:
Category : Stream channelization
Languages : en
Pages : 48
Book Description
Assessing Stream Channel Stability Thresholds
Author: Darren S. Olsen
Publisher:
ISBN:
Category : River sediments
Languages : en
Pages : 230
Book Description
Publisher:
ISBN:
Category : River sediments
Languages : en
Pages : 230
Book Description
Stream Channel Stability
Author: Deva K. Borah
Publisher:
ISBN:
Category : Mathematical models
Languages : en
Pages : 118
Book Description
Publisher:
ISBN:
Category : Mathematical models
Languages : en
Pages : 118
Book Description
Stream Channel Stability
Author: Joe C. Willis
Publisher:
ISBN:
Category : Mathematical models
Languages : en
Pages : 74
Book Description
In a stable alluvial channel, no net erosion or deposition of sediment occurs on the average. The sediment supply rate from upstream is balanced by capacity of the flow to transport the bed material. Any successful channel design must maintain this equilibrium or establish it for channel reaches that are not stable. Design relationships between the bed material transport capacity and the hydraulic variables of flow are based primarily on data from relatively small test channels. Reliable data for equilibrium transport of bed material by flows over about twenty cfs are not adequate to insure that data from small flumes can be extrapolated to prototype designs. An investigation was conducted in the 250-ft long test channel at the USDA Sedimentation Laboratory to obtain additional data on equilibrium transport by flows up to 150 cfs. Data on the transport rates, flow friction factors, and statistical properties of the bed forms were obtained. The results are presented as basic variable correlations with the controlled variables of the experiments, depth and discharge, along with attempts to generalize the relationships by similitude principles. (Author).
Publisher:
ISBN:
Category : Mathematical models
Languages : en
Pages : 74
Book Description
In a stable alluvial channel, no net erosion or deposition of sediment occurs on the average. The sediment supply rate from upstream is balanced by capacity of the flow to transport the bed material. Any successful channel design must maintain this equilibrium or establish it for channel reaches that are not stable. Design relationships between the bed material transport capacity and the hydraulic variables of flow are based primarily on data from relatively small test channels. Reliable data for equilibrium transport of bed material by flows over about twenty cfs are not adequate to insure that data from small flumes can be extrapolated to prototype designs. An investigation was conducted in the 250-ft long test channel at the USDA Sedimentation Laboratory to obtain additional data on equilibrium transport by flows up to 150 cfs. Data on the transport rates, flow friction factors, and statistical properties of the bed forms were obtained. The results are presented as basic variable correlations with the controlled variables of the experiments, depth and discharge, along with attempts to generalize the relationships by similitude principles. (Author).