Response analysis of the riverbed width-depth ratio to hydrographic and sediment condition in Jiaojiang Estuary

doi:10.3969/j.issn.1001-909X.2014.04.009

Abstract

Abstract: Based on the multi-year hydrographic and bathyorographical data, the long-term variation of the riverbed width-depth ratio of Jiaojiang Estuary was analyzed and the response of the riverbed width-depth ratio to hydrographic and sediment condition was tried to discuss. The results indicate that the influences of runoff and tidal dynamic on the riverbed configuration are always opposite along the river channel, runoff is more significant on bend reach above Jiangkousha, and tide dynamic is the dominant on the straight reach from the lower reach of Zhapu, which may be the influence factor of regulating difference of riverbed transection configuration between the bend reach and straight reach. The correlation between the width-depth ratio and mean suspended sediment discharge is positive, which indicates that the riverbed configuration has tended to be narrow and deep with the decrease of the suspended sediment discharge. The negative correlation between the width-depth ratio and mean water discharge may indicate that the riverbed configuration of straight reach has tended to be wide and shallow with the decrease of the water discharge. Human being may change the effect of the tidal dynamics to the riverbed configuration for decades, which result in the negative correlation between the width-depth ratio and mean tidal range.

Key words: Jiaojiang, width-depth ratio, riverbed configuration, long-term adjustment, statistical analysis

CLC Number:

TV148⁺.3

ZHOU Hong-quan, LI Bo-gen, GU Yu-bing, GONG Ming, YANG Hui. Response analysis of the riverbed width-depth ratio to hydrographic and sediment condition in Jiaojiang Estuary[J]. Journal of Marine Sciences, 2014, 32(4): 69-75.

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