汉江水华水文因素作用机理--基于藻类生长动力学的研究

在相关文献的基础上总结影响汉江水华的水文因素包括流量、流速和水面比降，根据河流动力学理论，讨论了它们之间的内在联系。在此基础上，从生物生长动力学的角度，将连续流反应器原理应用于汉江水华现象，提出了汉江连续流生物反应器模型，并根据Monod方程分析，认为汉江中的藻类浓度与水流速度应成指数关系。由此，建立了汉江藻类浓度与水流速度关系数学模型a = m exp(k/ν)。利用汉江1992年至2000年实测资料，通过回归分析进一步确定了汉江的藻类浓度与水流速度函数关系中的常数m=8.9759、k=0.9054，相关系数r=0.924 4。最后，对流速、流量和长江水位对汉江水华的作用机理进行了分析，揭示了水文因素影响汉江水华的作用机理。

MECHANISMS FOR HYDROLOGICAL FACTORS CAUSING ALGAL BLOOMS IN HANJING RIVER--BASED ON KINETICS OF ALGAE GROWTH

Mechanisms for hydrological factors causing algal bloom in Hanjiang River are studied. First, the hydrological factors relative to algal bloom in Hanjiang River and their relation are generalized. Then the river continuous reactor model for algae growth is created and moreover mathematics model describing relation between concentration of algal and flow velocity is built up according to continuous reactor principle and Monod Function—— a = m exp(k/ν ). Parameters in this model are determined by measuring data in Hanjiang River—m=8.975 9、k=0.905 4，the relative coefficient r=0.924 4. In the end, the influence of flow velocity, flux and water level of the Changjiang River is discussed. In addition, the model is extensively adaptive to eutrophic rivers and it can be studied progressively because the parameters have clear physical signification.