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It is known that there are two types of meanders; one is free meandering river and the other is incised meander. Formational and movement mechanisms of alluvial rivers are clarified well. However, the formational mechanisms of meandering rivers in lowland and wetland are not understood clearly. We measured the topography and flow velocity by using ADCP and GPS systems on Chiruwatsunai River, which runs through Kushiro Wetland National Park in Hokkaido. This paper shows results of velocity, topography, discharge, conditions of bar, traction or waftage and others. We clarified hydraulic characteristics and geomorphological characteristics of meandering rivers in lowland area and wetland are similar to them of incised meanders.

FORMATIONAL MECHANISMS ON MEANDERING RIVER IN LOWLAND AND WETLAND -HYDRAULIC CHARACTERISTICS OF CHIRUWATSUNAI RIVER IN KUSHIRO WETLAND NATIONAL PARK-