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21.
Field measurements of salinity, wind and river discharge and numerical simulations of hydrodynamics from 1978 to 1984 are
used to investigate the dynamics of the buoyant plume off the Pearl River Estuary (PRE), China during summer. The studies
have shown that there are four major horizontal buoyant plume types in summer: Offshore Bulge Spreading (Type I), West Alongshore
Spreading (Type II), East Offshore Spreading (Type III), and Symmetrical Alongshore Spreading (Type IV). River mouth conditions,
winds and ambient coastal currents have inter-influences to the transport processes of the buoyant plume. It is found that
all of the four types are surface-advected plumes by analysing the vertical characteristic of the plumes, and the monthly
variations of the river discharge affect the plume size dominantly. The correlation coefficient between the PRE plume size
and the river discharge reaches 0.85 during the high river discharge season. A wind strength index has been introduced to
examine the wind effect. It is confirmed that winds play a significant role in forming the plume morphology. The alongshore
wind stress and the coastal currents determine the alongshore plume spreading. The impact of the ambient currents such as
Dongsha Current and South China Sea (SCS) Warm Current on the plume off the shelf has also assessed. The present study has
demonstrated that both the river discharge and wind conditions affect the plume evolution. 相似文献
22.
介绍集装车与防尘统一于一体的无尘装车技术及具有设备本质安全化特点的无尘装车机在解决粉状物料装车作业时的扬尘问题,保护作业工人健康,维护厂区环境方面的重要优越性。 相似文献
23.
HCHs and DDTs in sediment-dwelling animals including mollusks and crabs from the Yangtze Estuary were determined by GC-ECD. Levels of t-HCH were in the range of 1.2-5.5 ng g(-1) and averaged 3.5 ng g(-1) in mollusks, while t-DDT concentrations ranged from 26.0 to 68.8 ng g(-1), with a mean of 34.5 ng g(-1). In crabs t-HCH concentrations varied from 2.0 to 25.7 ng g(-1) and averaged 13.8 ng g(-1), whereas the concentrations of t-DDT were in the range of 1.5-24.8 ng g(-1) with a mean value of 5.9 ng g(-1). The HCHs and DDTs levels depend on geographical position and sources, showing the high levels at fresh water area in the estuary, such as XP, CM and LHK sites, and lower at brackish water area, such as FX site, and little difference between species. Results also indicate there was no significant relationship between t-HCH (t-DDT) concentrations and lipid contents both in mollusks and crabs because of non-equilibrium state under a specific estuarine dynamics; smaller individuals accumulated more HCHs and DDTs than larger individuals of mollusks at LHK site, showing different uptake rate for these pesticides; moreover, HCHs and DDTs levels were lower in female crab bodies than male crab bodies suggesting that the release of spawning. BSAFs (Biota- Sediment Accumulation Factors) from sediment-dwelling animals for HCHs and DDTs show a significant "one high with two low" and "one low with two high" effect in the Yangtze Estuary. 相似文献
24.
Wang Feng Gao Changhai Ou Qi 《Environmental science and pollution research international》2021,28(5):5296-5315
Environmental Science and Pollution Research - The consumption of fossil energy is the major cause of environmental pollution. Effectively reducing the fossil energy use has important significance... 相似文献
25.
味精废水中重金属及金属污染对处理利用的影响 总被引:1,自引:0,他引:1
本文应用等离子光谱(ICP)测试三个厂家味精生产废水中21种金属元素的水平,其中金属元素的总水平分别达19192mg.l^-1,3190mg.l^-1和3161mg.l^-1,对照国内外有关的四项水质标准,三厂家味精生产废水中存在着Fe,Zn等多种重金属或其他金属元素严重超标现象,味精生产废水对青芋存在急性毒性,24,48,72和96h的半致死味精废水浓度LC50分别为6.9%,3.2%,2.5% 相似文献
26.
Thomas JE Ou LT Allen LH McCormack LA Vu JC Dickson DW 《Journal of environmental science and health. Part. B》2004,39(4):505-516
With the phase-out of methyl bromide scheduled for 2005, alternative fumigants are being sought. This study of Telone C35, a mixture of (Z)- and (E)-1,3-dichloropropene (1,3-D) with chloropicirin (CP), focuses on its emissions, distribution, and persistence in Florida sandy soil in microplots with different soil-water and organic matter carbon (C) content with and without two different plastic film mulches. The addition of CP did not affect the physical behavior of the isomers of 1,3-D. Slower subsurface dispersion and longer residence time of the mixed fumigant occurred at higher water content. An increase in the percent organic carbon in the soil led to a more rapid decrease for chloropicirin than for 1,3-dichloropene isomers. The use of a virtually impermeable film (VIF) for soil cover provided a more even distribution and longer persistence under all the conditions studied in comparison to polyethylene (PE) film cover or no cover. The conditions of near field capacity water content, low organic matter, and a virtually impermeable film cover yielded optimum conditions for the distribution, emission control, and persistence of Telone C35 in a Florida sandy soil. 相似文献
27.
建筑小区雨水径流的土壤渗透净化 总被引:3,自引:0,他引:3
讨论了建筑小区雨水径流的污染性、土壤渗透对小区径流的净化作用及土壤的渗透能力,提出了建筑小区雨水径流土壤渗透的工程实施方案。 相似文献
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