Study On Test Of Settling Basin For Oncomelania Snail And Drawing Water In Middle-level Project

Schistosomiasis is a kind of grave infectious disease that will harm human body seriously and slow the development of the society and the economy. As the Schistosome and the snail, which is the middle host of the parasite, breed in very complex circumstance, it is difficult to control, and only taking one measure to prevent it will not be successful. So the prevention and cure need to adopt all sorts of measure including sanitation, water conservancy, agriculture and forestry. Water conservancy project combined with schistosomiasis control include rivers and lakes fathering, embankment engineering, irrigation of saving on water, etc. They change the snail's survival conditions, avoid snail to diffuse, consequently decrease the crowd infection's chance. This is very important for schistosomiasis control.Sluice a low water-head building of water power engineering that adjust water level, control water flux, its function including keep off water and draw or discharge water. It is used abroad in prevent flood, control water logging, irrigation, water supply, ship, generate electricity, etc. The flowing water is the carrier when snails diffuse. So the preventing snail project must be built in sluice to control the schistosomiases spread.The preventing snail projects in sluice include the settling basin for oncomelania snail and drawing water in middle-level project. The settling basin can sink and collect snail. Drawing water in middle-level can avoid the snail in the surface and bottom of the water. At the present time the sluices of small flux mostly adopt the settling basin project, the effect is obviously. But the sluices of big flux lack efficient measures.The thesis test the setting of blocking wall in the settling basin (including one and two) and the setting of blocking bank. A physics model is built to study the stream structure in the basin, comparing with the flume simulating. And a great deal of test were done aiming at drawing water in middle-level, optimize the design for eliminate burble on taking water gap. On the foundation of studying on the two project measures for apply conditions, effect of blocking snail, good and bad qualities, the thesis try to reinforce and consummate the technique for sluice water conservancy project combined with schistosomiasis control.