Modelling the effect of drought on estuarine water quality

被引:49
作者
Attrill, MJ
Power, M
机构
[1] Univ Plymouth, Dept Biol Sci, Plymouth Environm Res Ctr, Benth Ecol Res Grp, Plymouth PL4 8AA, Devon, England
[2] Univ Waterloo, Dept Biol, Waterloo, ON N2L 3G1, Canada
基金
加拿大自然科学与工程研究理事会;
关键词
Thames; flow; temperature; pH; chlorinity; solids; oxygen;
D O I
10.1016/S0043-1354(99)00305-X
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Long-term data assembled for monitoring the water quality of the Thames estuary between 1977-1992 were used to examine the changing influences of physico-chemical variables on estuarine water quality during drought conditions. Seasonal and monthly means were computed and tested for significant differences. Time series data were used to estimate regression models explaining observed variations in water quality parameter measurements during the predrought (1977-1988) and drought (1989-1992) periods. Stability tests were used to establish significant differences in predrought and drought models and to make inferences about the significance of drought induced low flows on water quality. Significant mean seasonal and monthly differences were found for flow, chlorinity, temperature, dissolved oxygen, pH and suspended solids. Total oxidisable nitrogen showed no significant change. Regression analyses were consistent with these results and highlighted the significance of drought related changes in flow and temperature for the determination of estuarine water quality. This suggests that management policies designed to mitigate the effects of drought be extended to consider their effects on estuarine water duality given the ecological importance of these areas. (C) 2000 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:1584 / 1594
页数:11
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