大藤峡水利枢纽施工期通航水流条件优化布置  

Optimization of navigation water flow conditions for construction of Datengxia Water Conservancy Project

作　　者：黄春华 刘霞 马茂原 HUANG Chunhua;LIU Xia;MA Maoyuan(The Pearl River Hydraulic Research Institute,Guangzhou 510611,China)

机构地区：[1]珠江水利委员会珠江水利科学研究院,广东广州510611

出　　处：《水运工程》2023年第11期137-142,共6页Port & Waterway Engineering

摘　　要：大藤峡水利工程施工量大、建设周期长,必须采取措施保障枢纽施工期航道通行安全。针对一期施工导流围堰布置方案建立物理模型,研究该工程措施下明渠通航水流条件及可能造成安全隐患的因素。结果表明:纵向围堰上游头部处挑流引起结构腰部产生缓流区,明渠水体顺流束窄,不利于施工期船舶通航。在削除主槽局部凸滩、头部增设临时导流墙后导流明渠内水流流态明显改善。最大通航流量条件下各测点流速值均小于5.00 m/s;在下泄流量小于1.20万m^(3)/s时,各测点流速值均小于3.00 m/s,满足自航通行要求。导流明渠沿程水面比降较小,最大水面比降为-1.9‰。The Datengxia Water Conservancy Project has a large amount of construction with long period.It's necessary to take measures to guarantee the safety of channel navigation during the construction period of the hub.This paper establishes a physical model for the the layout plan of the first phase construction diversion cofferdam,and studies the water flow conditions and potential safety hazards of the open channel navigation under the engineering measures.The results show that the upstream head of the longitudinal cofferdam causes the slow flow area in the waist of the structure,and the open channel water body is narrow,which is not conducive to the navigation of ships during the construction period.After excavating the protruding part of the bottom of the main channel channel and adding a diversion structure at the front of the structure,the water flow in the open channel has been significantly improved.The velocity values of each measuring point are less than 5.00 m s under the condition of maximum navigable flow rate.When the discharge flow rate is less than 12000 m^(3) s,the velocity values of each measuring point are less than 3.00 m s,which meets the requirements of self-navigation.The water surface along the diversion open channel with low gradient,and the maximum is -1.9‰.

关 键 词：施工期通航 导流明渠 物理模型 通航水流条件 优化试验 

分 类 号：U64[交通运输工程—船舶及航道工程]