长隧洞低水头取水口闸门型式选择

对于低水头的隧洞引水，要求洞内的水流要平稳；采用无压隧洞自流引水，对洞内水流的流态要求更高。因此，取水头部进口闸门的作用就显得格外重要。不同的闸门型式，有其各自的优势和不足，必须结合工程的具体条件和建筑物布置，进行认真地比较和论证，从而确定最佳的闸门型式和布置方案。

Type selection of low-head intake gate for long tunnel

For the water diversion through low-head tunnel，the flow inside of the tunnel is required to be smooth and stable; nevertheless，the requirement on the flow pattern inside of the tunnel is higher for the gravity water diversion through a non-pressure tunnel. Therefore，the role of the gate of the intake head is quite important. As different types of gates have their own merits and defects，and then careful comparison and demonstration must be made in combination with the specific conditions and layouts of the buildings therein for them，so as to determine the optimal gate type and the layout scheme concerned.