【摘要】：為準(zhǔn)確評(píng)價(jià)污水深層排海對(duì)環(huán)境水域的影響,開(kāi)展深水排海的數(shù)值模擬預(yù)測(cè)研究具有重要意義。建立考慮泥沙和鹽度差引起的浮力射流影響的3維泥沙和鹽度輸移擴(kuò)散的RNGκ-ε紊流模型,通過(guò)室內(nèi)機(jī)理試驗(yàn)對(duì)模擬流場(chǎng)和鹽度場(chǎng)進(jìn)行了驗(yàn)證,模擬結(jié)果和試驗(yàn)結(jié)果符合較好;利用該模型對(duì)低鹽度含沙水流排入某海域后的水力特性以及鹽度和含沙量擴(kuò)散對(duì)環(huán)境水體的影響進(jìn)行模擬預(yù)測(cè)。結(jié)果表明:含沙的淡水水流排入海水后由于密度差而呈現(xiàn)出上升的浮力射流的特征,射流軸線在垂向上呈拋物線形態(tài);浮力射流到達(dá)水面后,以該點(diǎn)為中心,呈蝴蝶型形狀向四周擴(kuò)散,污染帶平面范圍逐漸增大,影響范圍內(nèi)鹽度持續(xù)減小,含沙量持續(xù)增加;污染帶在開(kāi)始時(shí)段擴(kuò)散速度較快,隨著摻入水體的影響范圍加大,污染帶邊界向四周推移的速度逐漸放緩。
[Abstract]:In order to accurately evaluate the influence of deep sewerage on environmental waters, it is of great significance to study the numerical simulation and prediction of deep-water drainage. The RNG 魏-蔚 turbulence model considering the effect of buoyancy jet caused by sediment and salinity difference is established. The simulated flow field and salinity field are verified by laboratory mechanism tests. The simulation results are in good agreement with the experimental results. The model is used to simulate the hydraulic characteristics of low salinity sediment flow and the influence of salinity and sediment content diffusion on the environmental water body. The results show that the flow of fresh water containing sand has the characteristics of rising buoyant jet due to the difference of density, and the axis of the jet is parabola in vertical direction. When the buoyant jet reaches the surface of the water, it spreads around in the shape of butterfly, and the plane range of the pollution zone increases gradually, the salinity decreases and the sediment content increases. The diffusion rate of the pollution zone is faster at the beginning, and the speed of the boundary of the pollution zone gradually slows down with the increase of the influence range of the adulterated water body.
【作者單位】： 四川大學(xué)水力學(xué)與山區(qū)河流開(kāi)發(fā)保護(hù)國(guó)家重點(diǎn)實(shí)驗(yàn)室;
【基金】：國(guó)家自然科學(xué)基金面上資助項(xiàng)目(851279114;851279115);國(guó)家自然科學(xué)基金青年基金資助項(xiàng)目(851409182) 國(guó)家重點(diǎn)研發(fā)計(jì)劃資助項(xiàng)目(2016YFC0401700)
【分類(lèi)號(hào)】：O358
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本文編號(hào)：2350421