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A platform for research: civil engineering, architecture and urbanism
Design of bridge crossings on meandering rivers
Conclusions As a result of investigations, formulas were derived which can be used when designing bridge crossings on meandering rivers with wide, developed floodplains passing the bulk of the design discharge during the flood (dependences for determining the value of the maxmum backwater, capacity of the opernings of the bridge crossing, and degree of contraction of the flow in them).The relative decrease of the capacity of the floodplain opening with increase of its cross-sectional area is due to a decrease of the maximum backwater and increase of the effect of the difference in the resistances of the main channel and floodplain.From the viewpoint of the capacity of the openings of the bridge crossing, reduction of the water level and subirrigation of the territory, decrease of the degree of contraction of the flow and, consequently, of the development of channel and floodplain deformations, the optimal cross-sectional area of the floodplain opening located in the zone of maximum backwater should amount to 25–50% of the total area of the openings.Hydraulic calculations performed separately for the main channel and floodplain with the use of the dependences taking into account the interaction of the channel and floodplain flows [7, 8] agree well with the results of the experimental investigations.The results of the investigations have great significance for developing optimal variants of bridge crossings being designed on meandering rivers.
Design of bridge crossings on meandering rivers
Conclusions As a result of investigations, formulas were derived which can be used when designing bridge crossings on meandering rivers with wide, developed floodplains passing the bulk of the design discharge during the flood (dependences for determining the value of the maxmum backwater, capacity of the opernings of the bridge crossing, and degree of contraction of the flow in them).The relative decrease of the capacity of the floodplain opening with increase of its cross-sectional area is due to a decrease of the maximum backwater and increase of the effect of the difference in the resistances of the main channel and floodplain.From the viewpoint of the capacity of the openings of the bridge crossing, reduction of the water level and subirrigation of the territory, decrease of the degree of contraction of the flow and, consequently, of the development of channel and floodplain deformations, the optimal cross-sectional area of the floodplain opening located in the zone of maximum backwater should amount to 25–50% of the total area of the openings.Hydraulic calculations performed separately for the main channel and floodplain with the use of the dependences taking into account the interaction of the channel and floodplain flows [7, 8] agree well with the results of the experimental investigations.The results of the investigations have great significance for developing optimal variants of bridge crossings being designed on meandering rivers.
Design of bridge crossings on meandering rivers
Salikov, V. G. (author)
1990
Article (Journal)
English
BKL:
56.30
Wasserbau
Local classification TIB:
770/6550/8000
Design of bridge crossings on meandering rivers
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