水动力过程后湖泊水体磷素变化及其对富营养化的贡献

对水动力过程后水体磷素的变化作了研究，并就其对富营养化的贡献作了分析探讨。研究表明，水动力过程后，TP的质量浓度因重力对含磷颗粒的作用而随沉降时间的延长而渐渐变小，且初期幅度大，后期则趋于平稳；而TDP的质量浓度则在初期因悬浮物的脱附作用而增大，继而随着悬浮物的粘带作用沉降而减少，但经足够长的静置沉降，其又由于水底沉积物的释放作用而增加，有初期“汇”，后期“源”的特点。而分析则表明：水动力过程后。水体磷素会因沉降而变小，但在相当长(50min)的时间里，其质量浓度仍处于高值，从而为湖泊的富营养化提供了最为必要的营养成分，加上不停地受到包括风动力在内的影响，这应是浅水湖泊富营养化，并难以治理的根源。

Change of phosphorus in lake after water dynamical condition and its contribution to eutrophication

The Change of phosphorus in water after dynamical condition was studied and its contribution to eutrophicaiton were evaluated. The study showed that after water dynamical condition, the concentration of Total phosphorus (TP) was decreased with time due to the impact of gravity on suspended solid. A rapid change was observed in the initial stage and it became stable therafter. Total dissolved phosphorus (TDP) was increased in the initial stage because of desorption, While the precipitate was decreased after that. However, when it sit for enough time TDP was increased because the suspended solid was released. The study indicated that after water dynamical condition phosphorus was decreased because of precipitation. However, its concentration was high within a long period (within 50 minites). This provided necessary nutrient to the lake. In addition, the continuous influence of pneumatic strength is also the reason for the difficulty of treating lake euthrophication.