Hydrological Processes of an Anastomosing River System on the Zhujiang River Delta, China

The interconnected channels of the Xijiang and Beijiang rivers on the Zhujiang River delta and the flood basins surrounded by the channels form an anastomosing river system. The system can be divided into three zones (A, B and C) that are influenced mainly by river current, tidal current or both. To...

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Veröffentlicht in:Journal of coastal research 2004-07, p.124-133
Hauptverfasser: Wang, Suiji, Ni, Jinren, Wang, Guangqian, Cheng, Dongsheng, Zhang, Ouyang
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container_title Journal of coastal research
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Ni, Jinren
Wang, Guangqian
Cheng, Dongsheng
Zhang, Ouyang
description The interconnected channels of the Xijiang and Beijiang rivers on the Zhujiang River delta and the flood basins surrounded by the channels form an anastomosing river system. The system can be divided into three zones (A, B and C) that are influenced mainly by river current, tidal current or both. To reveal the differences and the similarities between the two rivers and among the three zones in the system, six representative gauging stations were chosen to collect relevant data, such as the stream mean velocity, discharge, width, suspended sediment concentration, water level elevation and the width/depth ratio (W:D). Statistical relationships between these parameters were established. Although the planforms of both rivers on the delta show multiple channels, there are some differences in hydrological processes and channel morphology between the two rivers and among the three zones. The Xijiang channels are more efficient in hydraulic geometry than the Beijiang channels especially in Zone A. In Zone A, the channel W:D of the Beijiang River (about 80) exceeds 40 (the upper limit for an anastomosing river), but the Xijiang River W:D (30.4) is in the range. In zones B and C, the W:D of both rivers is in the range for an anastomosing river pattern. The channel gradient of the Xijiang River is lower than that of the Beijiang. The formation of the anastomosing system, and the differences between the two rivers and among the various channel reaches resulted from river self-adjustment; in this case human activities are not a factor.
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The system can be divided into three zones (A, B and C) that are influenced mainly by river current, tidal current or both. To reveal the differences and the similarities between the two rivers and among the three zones in the system, six representative gauging stations were chosen to collect relevant data, such as the stream mean velocity, discharge, width, suspended sediment concentration, water level elevation and the width/depth ratio (W:D). Statistical relationships between these parameters were established. Although the planforms of both rivers on the delta show multiple channels, there are some differences in hydrological processes and channel morphology between the two rivers and among the three zones. The Xijiang channels are more efficient in hydraulic geometry than the Beijiang channels especially in Zone A. In Zone A, the channel W:D of the Beijiang River (about 80) exceeds 40 (the upper limit for an anastomosing river), but the Xijiang River W:D (30.4) is in the range. In zones B and C, the W:D of both rivers is in the range for an anastomosing river pattern. The channel gradient of the Xijiang River is lower than that of the Beijiang. 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In zones B and C, the W:D of both rivers is in the range for an anastomosing river pattern. The channel gradient of the Xijiang River is lower than that of the Beijiang. 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subjects Fluvial channels
Fluvial erosion
Hydraulics
Hydrology
Natural channels
River deltas
Rivers
Sediments
Streams
Suspended solids
title Hydrological Processes of an Anastomosing River System on the Zhujiang River Delta, China
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