Hydrological Characteristics of the Lost River in the Ruoergai Wetland, China

概要

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In order to understand the hydrological characteristics of a lost river in wetland, the flow rate of the river and the groundwater table of the riverside in the lost river were investigated in Ruoergai wetland, Sichuan Province, China. The subject river of study had a general shape of the channel profile, which was an exponential curve for ordinary rivers. From the data of flow rates and groundwater tables, it became clear that this river increased in its flow rate from the spring point on the hill slope toward downstream, and rapidly decreased in it at the disappearance point in the wetland. The river was hydrologically characterized by the rapid disappearance due to the suction effect at the disappearance point in the wetland, where the river water was conducted through many holes (hydrological pipes) to the subsurface aquifer. It was considered that an extensive aquifer with a high hydraulic conductivity exists.
北海道大学の論文