EQUILIBRIUM CROSS-SECTIONAL GEOMETRY OF GRAVEL RIVERS TRANSPORTING SUSPENDED SEDIMENT

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  • Izumi Norihiro
    社団法人 土木学会 東北大学 工学部土木工学科
  • Parker Gary
    St Anthony Falls Laboratory, University of Minnesota

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  • 浮遊砂を輸送する礫床河川の平衡横断面形状
  • フユウサ オ ユソウスル レキショウ カセン ノ ヘイコウ オウダンメン ケイ

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Abstract

Gravel bed rivers transporting suspended sediment often have banks composed of fine sand (what we call “gravel bed sand bank morphology”). A theoretical model of the formation of “gravel bed sand bank morphology” is presented in this paper. The theory of equilibrium cross-section of sand-silt rivers is extended to include the case of gravel bed partially covered with fine sand. The theory shows that the location of sand deposition depends on the center depth, bed slope, sand size and sand supply. It is found that the bank regions tend to be filled with fine sand if center depth and bed slope are sufficiently large, and sand size is sufficiently small, and that the central bed region is covered with fine sand otherwise.

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