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Temporal-spatial Distribution and Its Influencing Factors of Suspended Particulate Matters in Minjiang Lower Reaches and Estuary(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2017年第06期
Page:
826-836
Research Field:
水资源与环境
Publishing date:

Info

Title:
Temporal-spatial Distribution and Its Influencing Factors of Suspended Particulate Matters in Minjiang Lower Reaches and Estuary
Author(s):
GONG Song-bai GAO Ai-guo LIN Jian-jie ZHU Xu-xu ZHANG Yan-po HOU Yu-ting
1. College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, Fujian, China;2. Marine and Fisheries Technology Center of Fuzhou, Fuzhou 350026, Fujian, China
Keywords:
suspended particulate matter salinity turbidity maximum zone temporal spatial distribution tidal cycle resuspension Minjiang
PACS:
P734.2+3
DOI:
-
Abstract:
For understanding the temporal-spatial distribution and its influencing factors of suspended particulate matters (SPM) in Minjiang lower reaches and estuary, the water samples during spring, summer, autumn and winter were collected from 2014 to 2015, and the intensive samples during spring and winter were carried out in estuary. The results show that the concentrations of SPM present the characteristics of “low-high-low” from Shuikou reservoir in Minjiang to the sea, and the concentrations during autumn and winter are higher than those during spring and summer; from high tide to low tide, the concentrations of SPM in estuary decrease from the river side to the sea side, and the concentrations during winter are higher than those during spring; the water is mixed and the salinity stratification is not obvious in estuary during winter, but the salinity stratification coefficient is significant, and the activity of saline wedge in estuary during flood and high tide has an effect on the distribution of SPM during spring; the turbidity maximum zone in estuary forms during dry season and declines during flood, and the location floats up and down with a tidal, usually upstream during autumn and winter and downstream during spring and summer; the influences of runoff, tide and salinity on the temporal-spatial distribution of SPM in estuary are obvious, meanwhile the influences of tide race, branch channel, saline wedge and other factors on SPM are magnified; the small and medium-sized estuaries reflect much more about the comprehensively effects of factors and their own characteristics on the distribution of SPM; compared to other great rivers in China, the concentration of SPM in Minjiang estuary is much lower than that in Yellow River estuary, and similar to that in Yangtze River estuary, while higher than that in Pearl River estuary which located in the south of Minjiang; the seasonal variation characteristics of SPM in Minjiang estuary are contrary to those great rivers, but the changing processes of SPM with tidal cycle are similar to these estuaries; due to the intensified erosion and hydrodynamic force in Minjiang estuary, the concentration of SPM shows an increasing trend, and will affect the geomorphology, ecology and the port and shipping in estuary.

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Last Update: 2017-12-15