Global ETD Search
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Showing 1 to 16 of 16 for “"riprap"”.
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Preliminary investigation of energy dissipation at culvert outlets using a riprap step
… flow at culvert outlets is the construction of a riprap energy dissipator. The current riprap design used by the WVDOH experiences problems with excessive sedimentation and is only applicable at culvert outlets where the flow velocity is low. The purpose of this investigation was to construct a …
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Analysis of riprap design methods using predictive equations for maximum and average velocities at the tips of transverse in-stream structures
… a major focus in design and must be protected. Riprap size is a significant component of the design and stability of transverse in-stream structures, and guidance is needed to select the appropriate size such that the structure remains stable throughout its design life. The U.S. Bureau of …
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Remote sensing and localization of smart rocks with orientation-controlled magnets for real-time monitoring of bridge scour and riprap effectiveness
… the maximum scour depth and the effectiveness of riprap mitigation measures. A smart rock is one or more stacked magnets encased in concrete that can automatically roll to the deepest point of a scour hole around a bridge pier and provide its location through remote measurement over time. Once …
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Evaluating ecological function provided by bank stabilization in Box Canyon Reservoir, WA
… structural means, such as vertical bulkheads and riprap/rock. However, hard bank stabilizing materials can radically alter ecological functions provided by native shoreline vegetation. Despite valid concerns regarding the use of riprap in bank stabilization, limited pre- and post-project …
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Streambank Stabilization & Restoration Within Turtle River State Park
… a 3:1 slope, the toe will be protected by rock riprap with underlying geotextile, and the slope will have an erosion blanket beneath the vegetation of live stakes and tree plantings</p>
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Evaluating Shallow-Flow Rock Structures as Scour Countermeasures at Bridges
… reliably be used at bridge abutments in place of riprap. Research was conducted in a two-phase effort beginning with numerical modeling and ending with field verification of model findings. As part of phase one, two finite element meshes were created in Surface-water Modeling Software (SMS) and …
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Evaluation of check dams for sediment control on disturbed land surfaces
… berm, plastic dam with a compost blanket, and a riprap berm. The check dams were evaluated in two studies, one on the University of Illinois South Farms and one under a rainfall simulator. Many climactic and soil factors were measured, although the main focus was on runoff and sediment removal. …
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Impacts of Hard Stabilization on the Shore of Yellowstone Lake, Yellowstone National Park, Wyoming, USA
… associated with shore armor (i.e. seawalls and riprap) are a common topic within the coastal community. While many agree that the installation of these structures alters the shores geomorphic response, there is disagreement in the type and degree of response. Furthermore, studies that have …
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Incipient Motion Under Shallow Flow Conditions
… can result in significant cost savings for riprap. Additionally, velocity profiles using a laser-Doppler velocimeter (LDV) were taken for the glass ball incipient motion experiments. The purpose of this was to study possible changes in the velocity distribution with decreasing relative depth …
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Geotechnical Investigation and Characterization of Bivalve-Sediment Interactions
… mitigation methods, such as the placement of riprap, the use of collars or slots, embedding foundations deeper, or a combination thereof can be costly, require long-term maintenance, and can potentially have detrimental environmental effects downstream. These difficulties with traditional …
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Análisis de procesos de erosión local en márgenes de cauces fluviales con curvatura en planta
… de erosión, la protección de escollera o riprap ha sido y continúa siendo hoy día uno de los métodos más utilizados en todo el mundo debido principalmente a sus características de flexibilidad, larga duración, facilidad de puesta en obra y reparación y apariencia natural. Los métodos de …
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EPIBENTHIC INVERTEBRATES AND JUVENILE CHUM SALMON (ONCORHYNCHUS KETA) PREY AVAILABILITY ALONG AN ECO-ENGINEERED SHORELINE: A CASE STUDY AT THE SEAWALL IN SEATTLE, WASHINGTON
… a nearby restored pocket beach, and two other riprap armored locations along the Seattle waterfront to compare prey selection among modified shorelines with and without the eco-engineered enhancements.Epibenthic invertebrate assemblages varied by exposure (under-pier and outside-pier) and …
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Applied geology of the Bismarck-Mandan area, North Dakota
… sand and gravel, abundant clay, and abundant riprap stone. To insure maximum use of the sand and gravel reserve, residential and industrial de.relopmet1t should not be allowed to cover the deposits.</p> <p>The highest quality water in the area is from the Missouri River. Ground-water can be …
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Erosion behavior and scour risk of extremely coarse streambeds
… the HEC-18 critical velocity and USACE EM 1601 riprap relations. Extrapolation of the limit results generally produces lower and more conservative critical velocities within the ECP size range than did the standard relations. Another application provides adjustment coefficients, which are useful …