LONG-TERM (1947-2019) CHANGES AND RESPONSES OF RIVER CHANNEL IN THE MIDDLE TAMA RIVER DUE TO FLOOD DAMAGES, COUNTERMEASURES AND RIVER CHANNEL IMPROVEMENTS

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  • 多摩川中流河道の洪水被害と対策，改修工事に対する河道の長期的(1947年～2019年)変化・応答

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<p> We investigated the long-term changes in river channel by using the observed data from 1947 to 2019 in the middle Tama River. The observed data showed that the mass gravel-digging until 1964 has caused river bed degradation and the river morphological structure with sandbars has been lost. However, since 1999, the bed elevation and width of the main channel began to be controlled mainly by the bed protection works installed at cross-structures and large scale floods over 2,000m3/s. These have caused movements of sandbars sediment supplied to the main channels from the immobilized sandbars due to erosions. The consideration of the long-term changes and responses of river channels provides important technological information for improvements and managements of future river channel.</p>

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