珠江三角洲水资源配置工程输水隧洞糙率取值范围研究

Study on the Value Range of Roughness of Water Conveyance Tunnel in the Pearl River Delta Water Resources Allocation Project

珠江三角洲水资源配置工程采用泵压输水,长期运行后隧洞内壁受淡水壳菜生长附着影响,过水断面减小,糙率和水头损失增加,在保证设计流量前提下,要求泵组扬程加大,这种由生物生长产生的动态糙率,将对泵组选型产生影响,如何在设计之初确定糙率变化范围,在缺少先例的情况下,需要对输水隧洞的检修条件、长度、是否有压流等方面综合研究确定。

Water resources allocation project of the pearl river delta by pumping water,after the long running tunnel wall affected by freshwater moule adhesion,water cross section is reduced,roughness and head loss increase,under the premise that guarantees the design discharge,increasing requirements pump group head,this kind of dynamic roughness produced by biological growth,will affect the pump group selection,how to determine the scope of the roughness change early in the design,in the case of lack of precedent,need comprehensive research.