SEDIMENT TRANSPORT IN THE RIVULETS NEAR KAIFU-URA, NIIGATA PREFECTURE

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  • 新潟県海府浦付近の渓流河川の流送土砂礫に関する研究(第一報)
  • ニイガタケンカイ フウラ フキン ノ ケイリュウ カセン ノ リュウソウ ドシャレキ ニ カンスル ケンキュウ 1

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Abstract

This paper is concerned principally with the problem of sediment transported by the drainage system of three rivulets (Hayakawa, Fukôgawa and Ôkawa) in the northern extreme of Niigata prefecture. A detailed survey was conducted on these rivers and the information was collected during the period from. Aug. 20, 1959 to Oct. 30, 1959. The information includes sediment discharges, particle size analysis of bed load, water discharge and other hydraulic data.<br> The purposes of this report are: (a) to present briefly the results of measurement on the transportation of bed load by water during high stages and to provide some conception of the unknown volumes of sediment transported. (b) to feature the relative importance of the bed load of the rivers. (c) to examine the relationship between the actual rate of sediment transport and the sediment transporting capacity of the natural watercourses. (d) to check the several formulae for critical tractive force and for the rate of sediment transport under natural conditions.<br> Samples of the travelling bed load were collected with box type bed load sampler during high water stages. From these data, curves of tractive force τ versus bed load discharge QB, median grain diameter of bed load d50, maximum grain diameter dmax, etc. were obtained respectively for each of these rivers.<br> From these curves fairy comparable relationships were found to exist between tractive force and other parameters. However, these curves suggest the existence of a sort of critical value, i. e. τ=4 kg/m2, below which there is no consistent relationships between tractive force and other parameters.<br> In applying critial tractive force formulae to the natural rivers, dmax instead of d50 agreed fairy well with the actual condition of movement of the bed load.

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