【摘要】：什川吊橋灘河段位于黃河大峽庫區(qū)，是黃河干流在甘肅境內(nèi)的一段，上游起始點為小峽水電站，下游終點為大峽水電站。該河段是黃河大峽庫區(qū)內(nèi)主要礙航灘險之一，嚴(yán)重影響通過船舶的航行安全。本文結(jié)合甘肅省交通運輸廳《甘肅省內(nèi)河水運發(fā)展規(guī)劃》“黃河大峽庫區(qū)航運建設(shè)工程”，以什川吊橋灘河段灘險整治為依托工程，通過收集水文、泥沙、地質(zhì)、河床形態(tài)、地形圖等資料，分析、歸納和總結(jié)吊橋灘河段的礙航特性和原因；通過河工模型試驗對什川吊橋灘的整治方案和整治效果進行研究；利用平面二維水流數(shù)學(xué)模型對整治前后河段水流要素變化進行計算、分析。取得了以下的研究成果： （1）通過收集河段的水文、泥沙等資料，分析說明了河段的礙航特性及原因，得出什川吊橋灘河段總體呈彎、淺、急、險的特征。 （2）建立了該河段平面比尺為1：100、垂直比尺為1：50的變態(tài)河工模型。針對什川吊橋灘河段的灘險特點，，共進行了四組河工模型方案試驗，通過對比分析不同方案整治前后河段的通航水流條件和泥沙沖淤變化，推薦方案四為什川吊橋灘河段整治工程的實施方案。工程實施后航道條件得到明顯改善，整治效果良好，證明什川吊橋灘河段所采取的淺區(qū)挖槽和深槽筑潛壩相結(jié)合的整治措施是科學(xué)的。 （3）利用什川吊橋灘河段水位及流速等實測資料對建立的平面二維水流數(shù)學(xué)模型進行了率定和驗證。并利用建立的數(shù)學(xué)模型，對河段整治前后的水流要素進行了計算分析：整治后河段的水面線更為平緩，縱、橫比降較天然狀態(tài)有所減小，流速大小控制在標(biāo)準(zhǔn)范圍之內(nèi)且流態(tài)平緩，有利于船舶的航行及停靠。且河段的水面線、縱橫比降以及流速、流態(tài)的變化與河工模型試驗的結(jié)果吻合度較高。
[Abstract]:Shichuan Daqiao Beach reach is located in the Daxia Reservoir area of the Yellow River. It is a section of the main Yellow River in Gansu Province. The starting point is Xiaoxia Hydropower Station and the downstream terminal point is Daxia Hydropower Station. The reach is one of the main obstacles to navigation in the Daxia Reservoir area of the Yellow River, which seriously affects the safety of navigation through ships. This paper, based on the Gansu Provincial Communications and Transportation Department and the Gansu Provincial Inland River Water Transport Development Plan, "the Navigation Construction Project of the Daxia Reservoir area of the Yellow River", relies on the regulation of the beach danger of Shichuan suspension bridge beach, through collecting hydrology, sediment, geology, river bed form, etc. Based on topographic maps, the characteristics and causes of obstruction of navigation in the river reach of suspension bridge beach are analyzed, summarized and summarized. The regulation scheme and regulation effect of Shichuan suspension bridge beach were studied by river engineering model test, and the variation of water flow elements before and after regulation was calculated and analyzed by using plane two-dimensional flow mathematical model. The following research results have been obtained: (1) by collecting the hydrological and sediment data of the reach, the characteristics and causes of obstruction of navigation in the reach are analyzed and explained, and the characteristics of the river reach of Shichuan suspension bridge beach in general being curved, shallow, urgent and dangerous are obtained. (2) A metamorphosed river model with a horizontal scale of 1: 100 and a vertical scale of 1:50 is established. In view of the beach risk characteristics of Shichuan suspension bridge beach reach, four groups of river engineering model tests were carried out, and the navigable flow conditions and sediment scour and deposition changes of the reach before and after the regulation of different schemes were compared and analyzed. The recommended scheme four is the implementation plan of the regulation project of Shichuan suspension bridge beach reach. After the implementation of the project, the waterway condition has been obviously improved and the regulation effect is good. It is proved that the combination of shallow dredging and deep trough submersible dam construction in Shichuan suspension bridge beach section is scientific. (3) based on the measured data of water level and velocity of water in Shichuan suspending bridge beach, the mathematical model of planar two-dimensional flow is established and verified. Using the established mathematical model, the factors of water flow before and after regulation are calculated and analyzed: after the regulation, the water surface line of the reach is more smooth, and the drop of longitudinal and transverse ratio is smaller than that of natural state. The flow velocity is controlled within the standard range and the flow state is smooth, which is beneficial to the navigation and docking of ships. The variation of the surface line, aspect ratio, velocity and flow state of the river reach is in good agreement with the results of the river engineering model test.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TV143;TV85

【參考文獻】

相關(guān)期刊論文 前6條

1 姚仕明,張玉琴,李會云;實體模型變率研究[J];長江科學(xué)院院報;1999年05期

2 竇國仁,董鳳舞,竇希萍,李y斃

本文編號：2355306