山區(qū)河流航道整治線寬度的確定及穩(wěn)定性分析
發(fā)布時(shí)間：2018-09-01 06:56
【摘要】：整治線寬度是淺灘整治工程設(shè)計(jì)中的重要參數(shù)，它決定了整治河段的斷面形態(tài)，直接影響到整治工程的質(zhì)量和工程量。樞紐的興建攔截了上游大量來沙，加之對徑流過程的調(diào)節(jié)，改變了樞紐下游河流的水沙條件，破壞了樞紐下游河流的平衡狀態(tài)，觸發(fā)其再造床過程，給樞紐下游河流功能的發(fā)揮帶來了一定的影響。在長期的低含沙水流作用下，河床將發(fā)生不同程度的沖刷下切或河岸展寬以及河型轉(zhuǎn)化等現(xiàn)象，從而影響河道的水流條件，進(jìn)而影響到航運(yùn)、防洪、取水和生態(tài)等多方面的人類活動(dòng)。因此，只有在對河流水沙輸移規(guī)律及其河床演變特性深入了解的基礎(chǔ)上，才能進(jìn)一步完善適用于樞紐壩下不同淺灘、不同沖淤規(guī)律的航道整治線寬度公式，規(guī)劃治理出朝良性循環(huán)方向發(fā)展的優(yōu)良航道。 本文主要針對樞紐壩下淺灘河段整治的特點(diǎn)，采用理論分析結(jié)合數(shù)值模擬等方法，取得了以下成果： （1）簡單分析了樞紐運(yùn)行之后，水沙條件及河床演變規(guī)律的改變與航道整治設(shè)計(jì)之間的關(guān)系，回顧了航道整治線寬度確定方法、水流挾沙力、河道阻力規(guī)律、泥沙輸移規(guī)律及泥沙數(shù)學(xué)模型的研究現(xiàn)狀，突出了整治線寬度的確定方法是解決水沙條件變化后樞紐壩下河段淺段整治的關(guān)鍵所在。 （2）考慮到來水來沙條件中泥沙粒徑的影響，引入中值粒徑，結(jié)合平灘河寬、平均水深、平均流速以及河床比降等因素提出了壩下河段航道整治線寬度確定的改進(jìn)方法，并采用國內(nèi)外多條河流的野外實(shí)測資料，確定了該整治線寬度公式的參數(shù)，，驗(yàn)證了其精度高于流量-比降公式及水力學(xué)公式。 （3）以白石窯樞紐壩下河段的航道整治工程為依據(jù)，采用本文推導(dǎo)的整治線寬度公式確定了該研究河段的整治參數(shù)。在此基礎(chǔ)上擬定了整治方案，建立了樞紐壩下河段平面二維水沙數(shù)學(xué)模型，對工程前后航道的穩(wěn)定性進(jìn)行了對比分析，結(jié)果表明研究河段枯水期水位降落明顯，流速略有增加，有利于減少泥沙淤積，維持挖槽穩(wěn)定。 （4）采用少水年、中水年及豐水年三個(gè)典型年的水沙資料對此河段的泥沙沖淤變化規(guī)律進(jìn)行研究，結(jié)果表明該河段總體輸沙能力有限，樞紐壩下~觀音巖河段沖刷較為嚴(yán)重，觀音巖以下河段受飛來峽水庫回水影響，流速減緩，輸沙能力減弱，河床以淤積為主，且呈累積性淤積態(tài)勢。最后，通過數(shù)學(xué)模型與物理模型試驗(yàn)結(jié)果的對比分析，發(fā)現(xiàn)各淺灘的淤積量、淺灘長度及最小航寬相差不大，進(jìn)一步說明了本文提出的整治線寬度改進(jìn)方法具有較好的可行性，能為工程提供參考。
[Abstract]:The width of the regulation line is an important parameter in the design of the shoal regulation project. It determines the section shape of the regulation river reach and directly affects the quality and quantity of the regulation project. The construction of the hub intercepts a large amount of upstream sediment, in addition to the regulation of the runoff process, which changes the water and sediment conditions of the downstream rivers, destroys the balance of the downstream rivers, and triggers the process of reconstructing the bed. It has brought certain influence to the function of downstream river. Under the action of low sediment flow for a long time, the river bed will be scoured and cut, river bank widened and river type transformed in varying degrees, thus affecting the flow conditions of the river, and then affecting the navigation, flood control, etc. Water and ecology and other aspects of human activities. Therefore, only on the basis of deep understanding of the water and sediment transport law and the evolution characteristics of river bed, can we further improve the width formula of channel regulation line suitable for different shoals and different erosion and siltation laws under the dam. Planning to govern the direction of benign cycle development of the good waterway. In this paper, according to the characteristics of the regulation of the shoal reach under the hub dam, theoretical analysis combined with numerical simulation is used to obtain the following results: (1) after the operation of the hub, The relationship between the change of water and sediment conditions and the evolution law of river bed and the design of channel regulation is reviewed. The current research status of channel regulation line width determination method, flow sediment carrying capacity, channel resistance law, sediment transport law and sediment mathematical model are reviewed. The method of determining the width of the regulation line is the key to the regulation of the shallow reach under the dam after the change of the water and sediment conditions. (2) considering the influence of the sediment particle size in the condition of incoming water and sediment, the median particle size is introduced, combined with the width of the Pingtan River. An improved method for determining the width of channel regulation line under the dam is put forward by the factors of average water depth, average velocity and river bed ratio drop, and the parameters of the regulation line width formula are determined by using the field measured data of many rivers at home and abroad. The accuracy is higher than the flow-ratio drop formula and the hydraulic formula. (3) based on the waterway regulation project under the Baishiyao Dam, the regulation parameters of the studied reach are determined by using the regulation line width formula derived in this paper. On the basis of this, the regulation scheme is drawn up, a two-dimensional mathematical model of water and sediment is established, and the stability of the channel before and after the project is compared and analyzed. The results show that the water level of the river reaches drops obviously and the velocity of velocity increases slightly during the dry period of the river reach. It is beneficial to reduce sediment deposition and maintain the stability of dredging channel. (4) using the water and sediment data of three typical years of less water year, middle water year and high water year to study the regularity of sediment scouring and silting in this reach. The results show that the overall sediment transport capacity of the reach is limited, and the erosion of the section under the hinge dam to the Guanyin Yan reach is more serious. The flow velocity of the section below Guanyin Rock is affected by the backwater of Feilaixia Reservoir, and the sediment transport capacity is weakened, and the river bed is mainly silted. And the accumulative siltation trend. Finally, by comparing and analyzing the results of mathematical model and physical model test, it is found that the siltation amount, shoal length and minimum navigation width of each shoal have little difference, which further shows that the improved method of improving the width of regulation line proposed in this paper has good feasibility. It can provide reference for engineering.
【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】：U617
本文編號：2216456
[Abstract]:The width of the regulation line is an important parameter in the design of the shoal regulation project. It determines the section shape of the regulation river reach and directly affects the quality and quantity of the regulation project. The construction of the hub intercepts a large amount of upstream sediment, in addition to the regulation of the runoff process, which changes the water and sediment conditions of the downstream rivers, destroys the balance of the downstream rivers, and triggers the process of reconstructing the bed. It has brought certain influence to the function of downstream river. Under the action of low sediment flow for a long time, the river bed will be scoured and cut, river bank widened and river type transformed in varying degrees, thus affecting the flow conditions of the river, and then affecting the navigation, flood control, etc. Water and ecology and other aspects of human activities. Therefore, only on the basis of deep understanding of the water and sediment transport law and the evolution characteristics of river bed, can we further improve the width formula of channel regulation line suitable for different shoals and different erosion and siltation laws under the dam. Planning to govern the direction of benign cycle development of the good waterway. In this paper, according to the characteristics of the regulation of the shoal reach under the hub dam, theoretical analysis combined with numerical simulation is used to obtain the following results: (1) after the operation of the hub, The relationship between the change of water and sediment conditions and the evolution law of river bed and the design of channel regulation is reviewed. The current research status of channel regulation line width determination method, flow sediment carrying capacity, channel resistance law, sediment transport law and sediment mathematical model are reviewed. The method of determining the width of the regulation line is the key to the regulation of the shallow reach under the dam after the change of the water and sediment conditions. (2) considering the influence of the sediment particle size in the condition of incoming water and sediment, the median particle size is introduced, combined with the width of the Pingtan River. An improved method for determining the width of channel regulation line under the dam is put forward by the factors of average water depth, average velocity and river bed ratio drop, and the parameters of the regulation line width formula are determined by using the field measured data of many rivers at home and abroad. The accuracy is higher than the flow-ratio drop formula and the hydraulic formula. (3) based on the waterway regulation project under the Baishiyao Dam, the regulation parameters of the studied reach are determined by using the regulation line width formula derived in this paper. On the basis of this, the regulation scheme is drawn up, a two-dimensional mathematical model of water and sediment is established, and the stability of the channel before and after the project is compared and analyzed. The results show that the water level of the river reaches drops obviously and the velocity of velocity increases slightly during the dry period of the river reach. It is beneficial to reduce sediment deposition and maintain the stability of dredging channel. (4) using the water and sediment data of three typical years of less water year, middle water year and high water year to study the regularity of sediment scouring and silting in this reach. The results show that the overall sediment transport capacity of the reach is limited, and the erosion of the section under the hinge dam to the Guanyin Yan reach is more serious. The flow velocity of the section below Guanyin Rock is affected by the backwater of Feilaixia Reservoir, and the sediment transport capacity is weakened, and the river bed is mainly silted. And the accumulative siltation trend. Finally, by comparing and analyzing the results of mathematical model and physical model test, it is found that the siltation amount, shoal length and minimum navigation width of each shoal have little difference, which further shows that the improved method of improving the width of regulation line proposed in this paper has good feasibility. It can provide reference for engineering.
【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】：U617
【參考文獻(xiàn)】
相關(guān)期刊論文 前10條
1 倪志輝;宋志堯;吳立春;;A New Model for Velocity Profiles in Estuarine Waters[J];China Ocean Engineering;2010年02期
2 劉峰,李義天;新的水流挾沙力計(jì)算公式[J];長江科學(xué)院院報(bào);1997年01期
3 陸永軍,陳稚聰,趙連白,邵學(xué)軍,楊美卿,李云中;三峽工程對葛洲壩樞紐下游近壩段水位與航道影響研究[J];中國工程科學(xué);2002年10期
4 江文勝,孫文心;渤海懸浮顆粒物三維輸運(yùn)模式的研究 Ⅱ.模擬結(jié)果[J];海洋與湖沼;2001年01期
5 朱建榮,傅德健,吳輝,戚定滿;河口最大渾濁帶形成的動(dòng)力模式和數(shù)值試驗(yàn)[J];海洋工程;2004年01期
6 李瑞杰;羅鋒;朱文謹(jǐn);;懸沙運(yùn)動(dòng)方程及其近底泥沙通量[J];中國科學(xué)(E輯:技術(shù)科學(xué));2008年11期
7 舒安平;費(fèi)祥俊;;高含沙水流挾沙能力[J];中國科學(xué)(G輯:物理學(xué) 力學(xué) 天文學(xué));2008年06期
8 倪志輝;吳立春;宋志堯;;近岸海域海面風(fēng)速分布的預(yù)測方法研究[J];空氣動(dòng)力學(xué)學(xué)報(bào);2010年05期
9 張紅武;張俊華;卜海磊;鐘德鈺;王艷平;;試論推移質(zhì)輸沙率公式[J];南水北調(diào)與水利科技;2011年06期
10 曹叔尤,劉興年,方鐸,李昌志;山區(qū)河流卵石推移質(zhì)的輸移特性[J];泥沙研究;2000年04期
本文編號：2216456
本文鏈接：http://sikaile.net/kejilunwen/jiaotonggongchenglunwen/2216456.html
最近更新
教材專著
