本文關(guān)鍵詞：錢塘江飲用水源地鹽水入侵及數(shù)值模擬　出處：《浙江大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 錢塘江河口 含氯度 潮汐 徑流 數(shù)值模擬

【摘要】：錢塘江為我國典型的強(qiáng)潮河流,擁有舉世聞名的錢塘江涌潮,強(qiáng)勁的潮流作用使咸水向上游入侵甚遠(yuǎn)。水源地受到鹽水入侵的影響頻繁,氯度超標(biāo)嚴(yán)重,原水水質(zhì)難以保證。尤其在枯水大潮期,鹽水入侵不同程度地影響著錢塘江飲用水源地的自來水廠及諸多取水口的水質(zhì)。因此,通過實測資料的分析和數(shù)值模擬相結(jié)合的方法研究錢塘江河口飲用水源地的鹽水入侵問題,不僅有助于改善杭州市的水環(huán)境質(zhì)量,同時對于提高居民健康水平、構(gòu)建和諧社會、促進(jìn)社會經(jīng)濟(jì)可持續(xù)發(fā)展具有十分重要的意義。 本文利用錢塘江河口沿岸8個測站2012年實時監(jiān)測的氯度資料,分析氯度隨時間和空間的變化規(guī)律及其影響因素,結(jié)果表明潮汐和徑流對水源地的氯度值、氯度的時間變化率、日潮不等現(xiàn)象、日超標(biāo)時間、氯度峰谷值滯后潮位峰谷值的時間等都有著巨大的影響。閘口站氯度是否超標(biāo)主要由潮差、徑流以及初始氯度三方面因素共同決定,當(dāng)澉浦潮差大于7.5m,上游富春江下泄流量為枯水徑流量,初始氯度值大于100mg/L時,飲用水源地可能發(fā)生氯度超標(biāo)的情況。每年的8-11月飲用水源地鹽水入侵較為嚴(yán)重。 本文基于Navier-Stokes方程和鹽度輸移方程,采用有限體積法進(jìn)行離散,建立了二維水動力鹽度數(shù)學(xué)模型,對聞家堰至倉前河段的潮流及鹽度輸移進(jìn)行數(shù)值模擬,研究在不同徑潮流組合下鹽水入侵的程度。研究結(jié)果顯示,大潮-平水徑流、大潮-枯水徑流以及小潮-枯水徑流組合都有可能發(fā)生水源地鹽度超標(biāo)的現(xiàn)象。當(dāng)枯水徑流時,通過增加徑流量對鹽水入侵的抑制作用非常明顯,當(dāng)流量大于500m3/s時,增加相同的流量對鹽水入侵的抑制作用逐漸減弱,豐水徑流時可忽略鹽水入侵對水源地的影響作用。在一個潮周期中七堡漲憩時刻和落急時刻之間的時間段是水源地鹽水入侵最嚴(yán)重的。本文的研究成果可為飲用水源地取水口的設(shè)置以及取水方案的選擇提供理論依據(jù)。
[Abstract]:Qiantang River is a typical strong tidal river in our country. It has the world-famous Qiantang River tidal current. The strong tidal current causes the salt water to invade upstream far away. The water source area is frequently affected by salt water intrusion, and the chlorine degree exceeds the standard seriously. It is difficult to guarantee the raw water quality. Especially in the low tide period, the salt water intrusion affects the water quality of the drinking water plant and many water intake in the Qiantang River drinking water source to varying degrees. Through the analysis of the measured data and numerical simulation, the study of saline intrusion in the drinking water source of Qiantang River estuary is not only helpful to improve the quality of water environment in Hangzhou, but also to improve the health level of residents. It is of great significance to build a harmonious society and promote the sustainable development of social economy. In this paper, the variation of chlorine with time and space and its influencing factors are analyzed by using the chlorine data of 8 stations in the Qiantang River estuary on 2012. The results show that the chlorine value of the water source, the time variation rate of the chlorine degree, the phenomenon of diurnal tide inequality, and the daily exceeding standard time of the tide and runoff. The time of chlorinity peak and valley value lags behind tide level peak and valley value has a great influence. Whether the chlorine degree of gate station exceeds the standard is mainly determined by three factors: tidal range, runoff and initial chlorine degree, when the tidal difference is greater than 7.5 m. The discharge of the upstream Fuchun River is dry water runoff, when the initial chlorine value is more than 100 mg / L. The drinking water source may have the situation that the chlorine content exceeds the standard. The salt water intrusion of drinking water source is more serious in August and November of each year. In this paper, based on Navier-Stokes equation and salinity transport equation, a two-dimensional hydrodynamic salinity mathematical model is established by using finite volume method. Numerical simulation of tidal current and salinity transport in Wenjiayan-Cangqian reach is carried out to study the degree of salt water intrusion under different diameters of tidal current combination. The combination of spring tide and low water runoff and the combination of low tide and low water runoff may occur the phenomenon that the salinity of the water source exceeds the standard. When the runoff is low, the inhibition effect on salt water intrusion is very obvious by increasing the runoff volume. When the flow rate was greater than 500 m3 / s, the inhibitory effect of increasing the same flow rate on salt water intrusion was gradually weakened. The influence of brine intrusion on water source can be neglected during high water runoff. The time period between the rising and resting time and falling time in a tidal cycle is the most serious in the water source area. The results of this paper can be used as drinking water. The setting of water intake and the selection of water intake plan provide theoretical basis.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU991.11

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本文編號：1371795