摘要
在环形水槽内模拟了太湖底泥的起动规律,分析了太湖底泥运动的不同状态,以及上覆水中总磷(TP)浓度随流速的变化关系,实验得出的太湖底泥在3种起动标准下对应的起动流速分别为35、45和60cm/s,并观察到上覆水中TP浓度在3种不同起动流速处出现了较大的跳跃;然后利用泥沙起动的理论模型计算了太湖底泥在3种不同起动标准(个别动、少量动、普遍动)下的起动流速和起动切应力,其值分别为37 9、46 7、59 8cm/s和0 428、0 636、1 042N/m2。两种方法得到的起动流速值比较接近,基本上反映了太湖底泥起动的实际状况。
The starting principles of sediment in Taihu lake are simulated in an annular tank, the different stages of sediment movement are analyzed, and the changes of total phosphorus (TP) concentration in upper water with velocity are studied in this paper. The experimental results show that the incipient velocities of sediment in Taihu lake at three different incipient standards (individual movement, ounce movement, universal movement) gained from the lab experiments are 35, 45 and 60?(cm/s )respectively, and the observed TP concentration in the upper water varies significantly at the three starting velocities. In this paper, the theoretical sediment starting model is also used to calculate the incipient velocity and the incipient shear stress of Taihu lake at three different starting standards. The calculated values are 37.9, 46.7, 59.8?cm/s and 0.428, 0.636 and 1.042?N/m^2, respectively. It can be concluded that the starting velocities gained from the lab experiments and the model simulation are fairly applicable, which can basically reflect the actual starting state of sediment in Taihu lake.
出处
《水科学进展》
EI
CAS
CSCD
北大核心
2004年第6期770-774,共5页
Advances in Water Science
基金
国家自然科学基金资助项目(50239030)
江苏省自然科学基金资助项目(BK2002067)~~
关键词
太湖
起动流速
起动拖曳力
底泥起动
起动规律
Taihu lake
starting velocity
incipient shear stress
releasing from sediment
starting principle
