Changes in stage-flow relation of the East River, the Pearl River basin: causes and implications Academic Article uri icon

abstract

  • Water level and streamflow extracted from 891 hydrological episodes from both dry and flood seasons covering a period of 19542009 were analyzed to investigate stageflow relations. Results indicate the following. (1) Since the early 1990s the low/high flow is increasing/decreasing. The water level, particularly the high level, is consistently decreasing. An abrupt decrease of water level is observed since the early 1990s at the lower East River. (2) Stagestreamflow relation is usually stable in the river reach with no significant bedform morphological changes. Changes in the geometric shape of the river channel are the major cause of the change in the stagestreamflow relation. (3) An abrupt decrease of water level at the Boluo station is mainly the result of abnormally rapid downcutting of the riverbed due to extensive sand dredging within the channel which caused serious headwater erosion. This human-induced modification by downcutting of the river channel may lead to significant hydrological alterations and may have critical implications for flood control, conservation of eco-environment, and also for basin-wide water resources management in the lower East River basin.

published proceedings

  • HYDROLOGY RESEARCH

author list (cited authors)

  • Zhang, Q., Li, K., Singh, V. P., Chen, X., & Li, J.

citation count

  • 7

complete list of authors

  • Zhang, Qiang||Li, Kun||Singh, Vijay P||Chen, Xiaohong||Li, Jianfeng

publication date

  • August 2013