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- W640777711 abstract "Stream simulation is a culvert design method to economically emulate the diversity and complexity of a natural channel inside a culvert. This paper describes site assessment procedures to gather the detailed information on the project site and reference reach that are needed to establish the design context and to design the culvert streambed and transitions to adjacent reaches. This paper discusses how interdisciplinary design teams use that geomorphic information to design culverts that ensure passage continuity for aquatic animals as well as water, sediment and debris, and that can be expected to maintain that continuity over the structure lifetime (barring extreme flood events). The paper recommends methods for determining design parameters for stream simulation culverts, including culvert size, slope, bed material size and arrangement, and channel transitions. The design process includes a bed stability analysis that depends on channel type and slope. Special issues such as steep channels, bedforms, and floodplain contraction are briefly discussed. Stream simulation design is based on the geomorphic form and function of the stream and, to succeed long-term, it requires a thorough understanding of the stream including past, present and possible future conditions. To successfully implement this design strategy, an interdisciplinary team should balance the biological, geomorphic and economic benefits and risks of different stream simulation design alternatives. Reference reaches provide the channel dimensions and slopes that are the templates for channel and bed design. Nonetheless, it is important to realize that flood flows confined within a culvert exert higher shear stresses on the bed than in the open channel. For this reason, except in low-gradient channels with highly mobile streambeds, key substrate pieces that maintain bed stability will usually be sized larger than those found in the reference reach." @default.
- W640777711 created "2016-06-24" @default.
- W640777711 creator A5014677463 @default.
- W640777711 creator A5090435465 @default.
- W640777711 date "2003-01-01" @default.
- W640777711 modified "2023-09-24" @default.
- W640777711 title "DESIGN AND CONSTRUCTION OF AQUATIC ORGANISM PASSAGE AT ROAD-STREAM CROSSINGS DESIGNING CULVERTS FOR AQUATIC ORGANISM PASSAGE: STREAM SIMULATION DESIGN" @default.
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