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峽谷區建壩高度對近壩區風(fēng)場(chǎng)特性的影響
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中國三峽建工(集團)橫向項目 ( JGAJ0422009)、中國氣象局西南區域氣象中心創(chuàng )新團隊(XNQYCXTD-202201,XNQYCXTD-202203)、高原與盆地暴雨旱澇災害四川省重點(diǎn)實(shí)驗室項目(SCQXKJYJXZD202104、SCQXKJYJXMS202315)資助


Study on Influence of Dam Elevation on Wind Field Characteristics Near Dam in Canyon Area
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    摘要:

    在復雜地形、副熱帶高壓和季風(fēng)天氣等因素共同影響下,高山峽谷區內風(fēng)場(chǎng)復雜多變,極易形成“狹管效應”,進(jìn)而導致災害性大風(fēng),對大型工程施工與運行造成較大影響。本文基于流體力學(xué)基本原理,采用標準k-ε紊流模型以及PISO(Pressure Implict with Splitting of Operator)算法,以白鶴灘水電站區域發(fā)生7級北風(fēng)為典型計算工況,研究了大壩建壩過(guò)程中近壩區風(fēng)速場(chǎng)變化規律和建壩對風(fēng)速場(chǎng)的影響范圍。成果表明:壩體的阻擋作用使風(fēng)速場(chǎng)在壩頂處產(chǎn)生繞流分離和風(fēng)場(chǎng)抬升,在建壩高程以下形成低風(fēng)速區;建壩高程650 m與750 m時(shí),纜機平臺范圍內風(fēng)速約15~16 m/s,大壩下游風(fēng)速垂直分布顯著(zhù)影響區河道長(cháng)度分別為4.4Ht和4.5HtHt為建壩高度);壩頂處風(fēng)速場(chǎng)顯著(zhù)影響高度分別為2.0Ht和3.0Ht。大壩蓄水至正常蓄水位825 m高度時(shí),大壩下游風(fēng)場(chǎng)顯著(zhù)影響區河道長(cháng)度為8.0倍壩高(2.3 km),最大影響河道區長(cháng)度為30.4倍壩高(8.8 km);壩頂影響高度達到1500 m高度左右,約3.5倍壩高。

    Abstract:

    Under the common influence of factors including complex terrain, subtropical high pressure, and monsoon weather, the wind field in the alpine canyon areas of is complex and changeable, and it is easy to form the “narrow pipe effect”, which leads to disastrous gales that have a great impact on the construction and operation of large-scale projects. In this paper, based on Fluent, a fluid dynamics computing software, a standard turbulence model and PISO algorithm are used to study the variation of wind velocity field near the dam during dam construction and the influence of dam construction on the wind velocity field, taking the level 7 north wind in Baihetan Hydropower Station as a typical calculation condition. The research results show that the blocking effect of the dam body makes the wind velocity field at the top of the dam generate flow separation and wind field uplift, and a low wind velocity zone forms below the dam elevation. When the dam elevation is 650 m and 750 m, the wind speed within the cable platform is about 15 m/s to 16 m/s, and the channel length of the significant influence area by the wind speed vertical distribution downstream of the dam is 4.4 Ht and 4.5 Ht (Ht being the dam height). The significant influence heights of the wind velocity field at the top of the dam are 2.0 Ht and 3.0 Ht respectively. When the dam is filled to the normal water level of 825 m, the channel length of the significant influence area by the wind field downstream of the dam is 8.0 times the dam height (2.3 km), and the maximum influence channel length is 30.4 times the dam height (8.8 km). The influence height of the dam top reaches about 1500 m height, which is 3.5 times the dam height.

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宋雯雯,師義成,陶麗,鄭昊.峽谷區建壩高度對近壩區風(fēng)場(chǎng)特性的影響[J].氣象科技,2024,52(3):446~455

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  • 收稿日期:2023-04-05
  • 定稿日期:2024-01-11
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  • 在線(xiàn)發(fā)布日期: 2024-06-25
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