【摘要】：淮河入江水道是黃河奪淮的產(chǎn)物,全長157.2公里；其中上段自三河閘至金湖改道段高郵湖入口,全長57.8公里,金湖段長31公里。自入江水道建成以來隨著年限的增加,行洪能力減小,根據(jù)近10多年行洪實(shí)況來看,入江水道行洪能力達(dá)不到原設(shè)計(jì)標(biāo)準(zhǔn),出現(xiàn)了“中流量、高水位、大防汛”的嚴(yán)峻狀況。究其原因,與入江水道內(nèi)障礙物分布現(xiàn)狀有直接關(guān)系,障礙物縮窄了行洪通道,阻礙行洪速度,延長洪水持續(xù)時(shí)間,給防汛工作帶來了很大的影響。為了充分發(fā)揮入江水道的泄洪功能,必須對(duì)入江水道內(nèi)行洪障礙進(jìn)行綜合治理。本文通過物理模型試驗(yàn)對(duì)金湖段大墩嶺整治前、后幾種工況下的水位、流態(tài)試驗(yàn)數(shù)據(jù)進(jìn)行了對(duì)比分析,以確定整治效果。并利用Fluent軟件對(duì)上述整治后物理模型各種工況進(jìn)行了數(shù)值模擬計(jì)算,并將計(jì)算結(jié)果與物理模型計(jì)算結(jié)果進(jìn)行了對(duì)比。研究的主要結(jié)論如下：1、中小流量(2000m3/s、4000m3/s、6000m3/s)工況下大墩嶺整治效果明顯；大流量(8000m3/s、1000m3/s、12000m3/s)工況下整治前后大墩嶺水位幾乎沒有變化,大墩嶺出現(xiàn)局部雍水現(xiàn)象。2、整治前大墩嶺下游灘地的漫灘流量約為500m3/s,整治后大墩嶺下游的灘地漫灘流量約為1500m3/s,大墩嶺下游灘地的漫灘流量增加了1000m3/s左右。整治前大墩嶺下游灘地漫灘時(shí)東、西漫水閘的差值大約0.56m,整治后大墩嶺下游灘地漫灘時(shí)東、西漫水閘的差值大約0.16m,整治工程對(duì)大墩嶺下游灘地水流漫灘同步性有很大的改善。3、整治后大墩嶺的邊界變小,大墩嶺下游與改道段間漩渦區(qū)面積變小,大墩嶺周邊流態(tài)得到了改善,整治效果明顯。4、利用Fluent軟件,對(duì)整治后流量工況2000m3/s、4000m3/s、6000m3/s、8000m3/s、 1000m3/s、12000m3/s時(shí)大墩嶺附近流場(chǎng)進(jìn)行了數(shù)值模擬計(jì)算,數(shù)值模型計(jì)算結(jié)果與物理模型計(jì)算結(jié)果基本一致。隨著流量的增大位于大墩嶺下游與東西漫水閘之間的回流區(qū),在河道的橫向方向上對(duì)應(yīng)的寬度變小,流速分布更加均勻。
[Abstract]:The Huaihe River channel is the product of Huanghe River, with a total length of 157.2 km, in which the upper section from Sanhe Gate to Jinhu diversion section of Gaoyou Lake entrance is 57.8 km in length and 31 km in length. Since the completion of the waterway into the river, with the increase of the number of years, the flood discharge capacity has decreased. According to the fact of flood discharge over the past 10 years, the flood discharge capacity of the waterway into the river has not reached the original design standard, resulting in a severe situation of "medium discharge, high water level and great flood control". The reason is directly related to the distribution of obstacles in the river channel, which narrows the flood passage, obstructs the flood discharge speed, prolongs the duration of the flood, and has a great impact on flood control work. In order to give full play to the flood discharge function of the waterway into the river, it is necessary to comprehensively treat the flood discharge obstacles in the waterway. In this paper, the experimental data of water level and flow state before and after the regulation of Dadun Ridge in Jinhu reach are compared and analyzed by physical model test, in order to determine the effect of regulation. The numerical simulation of the physical model was carried out by using Fluent software, and the results were compared with those of the physical model. The main conclusions of the study are as follows: 1. Under the condition of small and medium flow rate (2000m3 / s) (2000m3s / s4000m3s), the effect of Dudunling regulation is obvious; Under the condition of large discharge (8000m3 / s1000m3 / s-1 2000m3s), the water level of Dadun Ridge hardly changed before and after the renovation, and the local Yongshui phenomenon appeared in Dadunling. 2. Before the regulation, the flood rate of the beach in the lower reaches of Dadun Ridge was about 500m3 / s. The floodplain discharge in the lower reaches of Dadun Ridge is about 1500m3 / s after regulation, and the 1000m3/s is increased in the floodplain of Dadunling lower reaches. The difference between the floodplain in the lower reaches of Dadun Ridge before regulation and the floodplain in the lower reaches of Dadun Ridge is about 0.56 m, and that in the floodplain in the lower reaches of Dadun Ridge after the regulation is about 0.16 m. After regulation, the boundary of Dadun Ridge becomes smaller, the area of vortex area between Dadun Ridge and the diversion section becomes smaller, and the flow pattern around Dadun Ridge is improved. The effect of regulation is obvious. 4. Using Fluent software, the flow field near Dadun Ridge is numerically simulated when the flow rate is 2000m3 / s4000m3 / s0 / 6 000m3 / s, 1000m3 / s / s 12000m3 / s, respectively. The result of numerical model is basically consistent with that of physical model. With the increase of the flow rate, the width corresponding to the transverse direction of the channel becomes smaller and the velocity distribution is more uniform, which is located in the backflow zone between the lower Dadun Ridge and the east-west overflow sluice.
【學(xué)位授予單位】：揚(yáng)州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TV85

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本文編號(hào)：2399498