Hjulström’s Diagram: Understanding the Formation of Detritus Sediment Strata Associated with Stream Water

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  • ユールストロームダイアグラム―流水による砕屑物からなる地層の形成の理解―
  • ユールストロームダイアグラム : リュウスイ ニ ヨル サイクズモノ カラ ナル チソウ ノ ケイセイ ノ リカイ

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<p>This paper attempts to explain the Hjulström’s diagram, which is an important tool to understanding the formation of detritus sediment strata associated with stream water. Although the Hjulström’s diagram was first introduced around 80 years ago, it is still useful when attempting to understand the manner in which detritus beds form deposits in water. The diagram also illustrates the relationship between the grain size of sediments and the flow velocities at the time of deposition and erosion. Strata are formed due to the deposition of beds with differing grain sizes during cyclic flow velocity changes. Each depositional environment coincides with a specific hydraulic energy at which the fluctuation in flow velocity exhibits a specific range; therefore, beds having specific grain sizes are deposited. Coarse-grained sediments are generally deposited in environments with high hydraulic energy, while fine-grained sediments are more general in environments with low hydraulic energy.</p>

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