結氷時の感潮域におけるADCP を用いた流量観測手法

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  • ケッピョウジ ノ カン チョウイキ ニ オケル ADCP オ モチイタ リュウリョウ カンソク シュホウ

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Abstract

Data on river discharge is essential for basin-wide water resource planning.Hydraulic phenomena in the freezing waters of ariver's tidal zone have not been suffciently clarifed,because it is difficult to observe river conditions under ice sheets and the flow regime in such zones with unsteady flow is complex. Discharge in the tidal zone of ice-covered rivers has been measured using the conventional discharge measurement method for ice-freerivers, even though the accuracy of such measurements is questionable. Toward achieving an improved discharge measurement method for ice-covered rivers, it is necessary to clarify the hydraulic phenomena in the ice-covered tidal zone. Our field observation in the tidal zones of two ice-covered rivers revealed two main findings: １）Observations at the Tokoro River revealed that it might be possible to apply a discharge estimation equation for the tidal zone of an ice-free river(Sato,Nakatsugawa)to an ice-covered river. The discharge estimation equation for the tidal zone of an ice-covered river employed a different value for the coefficient. ２）In using an ADCP to measure the average discharge within a cross-section of a river channel with unsteady flow, prolonging the measurement duration did not improve measurement accuracy. The measured values showed little difference according to the measurement duration. We concluded from field survey at the Teshio River that 10-second measurement is sufficient for measuring discharge in the ice-covered tidal zone.

Journal

  • 寒地土木研究所月報

    寒地土木研究所月報 642 9-16, 2006-11

    国立研究開発法人 土木研究所 寒地土木研究所

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