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971.
972.
1991年4~12月,在大连湾鲍鱼(HaliotisdiscushannaiIno)养殖场的养殖区进行了底栖生物调查研究。应用生物丰度、生物量比较(ABC)法与种内个体对数正态分布(对数-正态)法,分析研究了底栖动物群落结构的变化,对网箱养鲍诱发的有机污染进行了监测。结果表明,该水域已受到中等程度污染。该项研究还对两种生物监测方法进行了讨论。 相似文献
973.
适用于大中尺度污染物输送模式的粒子干沉降参数化方案 总被引:2,自引:0,他引:2
用“二层”模式给出一个适用于污染物输送模式的粒子干沉降参数化方案,它比较详细地考虑了近地面层的气象条件,地表特性和气溶胶粒子的物理、化学特性等。从计算值与观测值的比较来看,计算值的离散范围能涵盖所有的观测结果,因而从总体上看此参数化方案是合理的,能够描述粒子总污染物干沉降的主要物理过程及机制。
相似文献
974.
975.
Alexander Korobkin 《Ocean Engineering》1998,25(8):687-714
The impact of an elastic plate onto the compressible fluid without free surface deformation is considered. The ability of the liquid volume to be deformed is geometrically limited which leads to severe impact conditions. The present analysis is focused on the stresses in the plate and the hydrodynamic loads under the impact. The motivation for this research comes from ship hydrodynamics, where the hulls of a catamaran restrict the liquid outflow and the water impacts onto the wetdeck. The influence of the air on the impact process is investigated. The analysis did not reveal any great advantage of utilizing the air-cushion effect or ejection of air into the water near the impact region to prevent high stresses in the elastic plate. It was found that in the problem considered, the stress peaks far from the plate centre and the one-mode approximation does not provide correct information about the stress level. 相似文献
976.
太湖梅梁湾三维水动力学模型的研究 Ⅱ.营养盐随三维湖流的扩散规律 总被引:6,自引:0,他引:6
建立了太湖梁梁湾三维营养盐浓度扩散模型,研究了三维潮流的作用下,营养盐随风场的扩散情况。结果表明:(1)当梁溪河和闾江口两个污染源同时存在时,西北风最有利于营养盐浓度的扩散,顺着风向形成了一条西北-东南走向的污染带;而东南风却最不利于营养盐浓度的扩散,使得污染范围仅局限于污染附近。 相似文献
977.
镧-氨基酸络合物对球等鞭金藻的影响 总被引:3,自引:0,他引:3
本文首次研究了镧-脯氨酸和镧-苯丙氨酸络合物对球等鞭金藻(Isochrysis galbana)的影响,结果表明,两种络合物对球等鞭金藻细胞繁殖及叶绿素的合成有明显的促进作用,浓度范围为5-20mg/dm3时,至第6天细胞数分别提高10.8%~17.2%,11.5%-20.5%(P<0.05);叶绿素浓度分别提高31.7%-37.5%,44.7%~48.4%(P<0.05),其中以浓度为10mg/dm3的实验组最高。镧的氨基酸络合物对球等鞭金藻的作用效果与镧相比是等同的。 相似文献
978.
Meddies are warm and saline anticyclonic eddies found at the mid-depth of the Mediterranean Outflow in the Eastern North Atlantic.
They are observed to move almost southward at average speeds as high as 1.3±0.2 cm s−1. This paper examines a mechanism which accelerates this curious translation to a reasonable speed when combined with nonlinearity
and a suitable vertical eddy structure. This mechanism is thepseudo-topographic β effect due to the westward decrease in the thickness of the mid-layer induced by the surface southward mean current. The
linear dispersion relation including this effect is shown to account for a quarter of the surface southward mean current or
a fifth of the observed southward translation of meddies. Three-layer quasi-geostrophic experiments reveal that the surface
southward mean current certainly enhances the southward translation velocity of meddies to a speed in agreement with observation,
if the meddy has a current structure of plausible intensity and vertical coherence. In the light of the current-induced pseudo-topographic
β effect, previous hypotheses are also re-examined through dynamic arguments together with numerical experiments; they are
suggested to have some difficulty either in dynamics or in correspondence with observation. Thus the nonlinear effect due
to secondary eddies combined with thecurrent-induced pseudo-topographic β effect is the most likely mechanism responsible for the rapid southward translation of meddies among those examined in
the paper. 相似文献
979.
980.
Mercury, cadmium, lead, copper, zinc and chromium were assessed in brown shrimp (Crangon crangon), swimming crab (Liocarcinus holsatus), hermit crab (Pagurus bernhardus), starfish (Asterias rubens) and cut trough shell (Spisula subtruncata) from ten sampling stations off the Belgian coast, including three dredge spoils disposal sites. Calculations of time trends indicated that on the whole concentrations of trace metals had significantly decreased since 1981, also on dredged material dumping sites. Starfish and hermit crab were found to be the most promising benthic indicator species for metal contamination. Globally, the location of the sites, including the dredge spoils disposal zones, showed to be of little influence on the concentrations of trace metals. 相似文献