| In allusion to the problem of petroleum hydrocarbon (PH) polluting and environmental capacity in Jiaozhou Bay, based on the experiment and dynamic model of PH, a model of environmental capacity of PH in Jiaozhou Bay has been developed after careful study, in which three modules are improved-phytoplankton, hydrodynamic and volatilization. The model is perfected by integrating ecological dynamic model for nutrient cycle with Jiaozhou Bay hydrodynamic model. Through the application of the models above, the effective factors of PH and hydrodynamic self-purification capacity about PH in Jiaozhou Bay have been obtained for the environmental capacity model. Through the study of environmental capacity model of PH in Jiaozhou Bay, the environmental capacity and surplus environmental capacity of PH in different degrees of pollution have been determined on a quantificational basis.As a summary of the work referred to in this paper, the following achievements and conclusions have been detailed:wWith batch culture experiments in lab and ship, the effects of PH on the growth of marine algae in Jiaozhou Bay has been studied. The experimental results show that lower doses promoted the growth of marine algae. A growth model, with consideration of effects of petroleum hydrocarbon on thegrowth of marine algae, was developed by incorporating rectified Logistic growth model with Lorentz equation. And the effective factor of petroleum hydrocarbon on the growth of marine phytoplankton in Jiaozhou Bay has been obtained for the environmental capacity model.? A3 dimensional hydrodynamic pollution transportation model of Jiaozhou Bay, which adapts to the complicating seashore and refines the near shore region with curvilinear grid, have been developed. So the physical self-purifying capacity of Jiaozhou Bay can be calculated. The results illustrate that, the physical self-purifying capacity of PH in Jiaozhou Bay was about 100 t in 1997; there are seasonal variations about it, which are mainly affected by river input, as well as tide and wind; Maximal exchange amount occurs in autumn and winter, while minimal exchange amount in spring and summer, and the larger the tide is ,the larger the output will be; the hemi-exchange time has been obtained for the capacity model, which is lasted about 28 days, as well as tide factor and wind factor.? Based on the dynamic model of PH and the ecological dynamic model for nutrient cycle, the environmental capacity model was developed, including the PH effective factor and hydrodynamic parameters. The results showed that this model could simulate the seasonal variations of PH and phytoplankton biomass properly, which show that not only the logical structure but also model parameters were feasible.? A method has been established to calculate the Environmental Capacities (ECo), Surplus Environment Capacities (SECo) ofPH and the Self-purification Capacities (5PCo) of main self-purification process to PH in Jiaozhou Bay, China, according to the environmental capacity model of marine PH . Based on the model, the self-purification capacity and the standard self-purification capacity, the environmental capacity, surplus environment capacity of PH under different seawater quality requirements are calculated in Jiaozhou Bay. The result shows that the self-purification of water for PH is mainly due to the processes of volatilization, biodegradation and water transportation, the relative self-purification capacity of which were respectively 48, 28 and 23%. However, the relative self-purification capacity of bioconcentration for PPT and geo-chemical were less than 1%, which could be neglected to the self-purification of PH in Jiaozhou Bay. The environmental capacity of PH were 1.5, 9 and 15 kt/y separately for the quality requirements of first ^ second and third, forth class national seawater quality standards of China. The results show that: From now on, about 600 ton of PH could be discharged to Jiaozhou Bay under the first and second class national seawater quality standards.
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