How to Draw a Graph of Flow Velocity Changes from Columnar Section DataUsing the Hjulström Diagram

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  • ユールストロームダイアグラムを用いて柱状図データから流速変化のグラフを描く方法

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<p>This paper explains how to draw a graph of flow velocity changes from columnar section data using the Hjulström diagram. The procedure is as follows:(1) recognition of erosional and/or depositional events within a columnar section,(2) reading flow velocity for each event using the Hjulström diagram,(3) plotting the readings, and (4) drawing a curve of flow velocity changes. In the procedure, sedimentological knowledge is required, especially for the recognition of erosional events, but the changes in flow velocity can be drawn only with depositional events, which are easy to recognize in columnar sections.</p>

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