西七里海蓄滞洪区分洪口门下移可行性研究.pdfVIP

摘 要 1992 年，西七里海被确定为永定新河的临时滞洪区，将七里海蓄滞洪区的 分洪口门设在28+192 的位置。依据《天津市设计洪水、中小洪水调度方案》， 滞洪区的运用原则：当永定新河28+192 断面处水位达5.84 米，西七里海临时 分洪区做好分洪准备，宁河县防指开始扒除区内阻水隔埝。 七里海作为永定新河的临时蓄滞洪区并没有实际运用过，随着社会经济的 发展，在28+192 分洪口门附近的分洪道内已有不少的工厂企业、蔬菜大棚及用 于生产、生活的道路和隔埝。而这些企业，工业及农业基础设施，已经严重阻 塞了过洪道行洪能力。同时，众多的企业及厂区设施，很难在短时期内有效的 清理和拆除，并且需要大量的资金用于安置和转移，才能恢复过洪道原先设计 的行洪功能。 建议将分洪口门下移到32+000 处。蓄滞洪区分洪口门位置的变动，势必会 对永定新河向七里海的分洪效果，及对整个永定新河的防御洪水体系的运行产 生一定的影响。因此本课题将利用河网模型及二维洪水蓄滞洪区演进模型，分 析七里海分洪口门位置的下移，对永定新河分洪效果的影响，对不同的分洪位 置方案下，七里海蓄滞洪区的经济损失进行评价分析，为西七里海蓄滞洪区分 洪口门下移方案提供可行性分析，从而为永定新河的防汛调度工作提供参考依 据。 关键词： 西七里海、分洪口门下移、河网水流模型、二维洪水演进模型 ABSTRACT On 1992, West Qilihai was identified as Yongding New River temporary detention basin, seven Caspian Flood flood diversion gate in28+ 192 position. On the basis of Tianjin city design flood, flood control and flood detention zone, the application principle: when the Yongding New River 28+192section of water level of 5.84 meters, seven West Caspian temporary flood diversion area to flood diversion, Ninghe county began removing the internal resistance refers to the water isolation Shanian area. Yongding New River seven Caspian as temporary detention basin and no practical uses, along with the development of social economy, in the 28+ 192flood diversion gate near the floodway has many factories and enterprises, and for the production of vegetable big canopy, the way of life and the vibration shanian. While these enterprises, industrial and agricultural infrastructure, has seriously blocked over the spillway flood discharge capacity. At the same time, many enterprises and factory facilities, is difficult in a short period of time effective cleaning and removal, and requires a large amount of funds for the placement and movement, can be recovered its original design flood function. In 2010 Ninghe flood control office suggested that the flood diversion gate down to32