發(fā)布時間：2018-03-02 19:23

  本文選題：FVCOM　切入點：連江　出處：《國家海洋環(huán)境預(yù)報中心》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：最近幾十年間,近岸的生活垃圾和工業(yè)廢物、廢液的排放加劇了近岸水體的富營養(yǎng)化,造成赤潮頻發(fā),對近岸海水漁業(yè)養(yǎng)殖造成了很大的經(jīng)濟損失,破壞了沿海區(qū)域的可持續(xù)發(fā)展。建立水動力-水質(zhì)耦合模型,能夠有效地預(yù)測水質(zhì)狀態(tài)變量的變化趨勢,為近岸漁業(yè)養(yǎng)殖提供技術(shù)支撐。本文基于FVCOM(An Unstructured Grid,Finite-Volume Coastal Ocean Model)模型建立了較高分辨率的福建連江海域水動力模型,在驗證結(jié)果較好的基礎(chǔ)上,建立三維水動力-水質(zhì)耦合模型。模型驗證結(jié)果能較好的模擬福建連江海域的水位、溫度、流場等物理量,能基本的模擬出葉綠素a、溶解氧、營養(yǎng)鹽等水質(zhì)狀態(tài)變量的時空分布特征。并且利用WASP(The Water Quality Analysis Simulation Program)模型公式建立零維模型,針對浮游植物進行參數(shù)敏感性實驗。本文的主要研究結(jié)果如下:(1)該海域是規(guī)則半日潮類型,潮波主要沿著福建東南沿海自東北向西南方向傳播,越靠近岸邊,振幅越大;同潮圖中的等振幅線和等遲角線在近岸海域基本垂直,有逆時針旋轉(zhuǎn)的駐波系統(tǒng)的特性。最大可能潮差與岸線走向基本平行,從5.5m左右逐漸增大到三沙灣、興化灣的灣口,約為8.5m左右,從灣口向灣內(nèi)逐漸增加到9m左右。(2)該海域的潮流類型在平潭以北屬于規(guī)則半日潮流類型,平潭以南屬于不規(guī)則半日潮流類型;靠近岸線區(qū)域的研究區(qū)域,表現(xiàn)為往復(fù)流,在興化灣、平潭、閩江以外海域表現(xiàn)為旋轉(zhuǎn)流。潮流橢圓圖顯示,半日分潮流、全日分潮流多數(shù)為逆時針旋轉(zhuǎn)。(3)潮位驗證的平均絕對誤差小于0.2m,海流流速平均絕對誤差小于0.08m/s,流向平均絕對誤差小于30°,溫度平均絕對誤差小于1℃。(4)水質(zhì)狀態(tài)變量中溶解氧數(shù)值模擬結(jié)果與浮標數(shù)據(jù)對比,其平均絕對誤差在0.32mg/l,并基于模擬結(jié)果分析了春夏季的月平均葉綠素a、硝酸鹽和亞硝酸鹽、活性磷酸鹽的時空變化特征。(5)對浮游植物進行參數(shù)敏感性實驗,結(jié)果表明敏感度較高的參數(shù)包括:最大生長率、浮游植物死亡率、浮游植物呼吸作用率。
[Abstract]:In recent decades, the discharge of domestic refuse and industrial waste from coastal waters has aggravated eutrophication of coastal waters, caused frequent red tide, and caused great economic losses to coastal mariculture. The coupling model of hydrodynamics and water quality can effectively predict the change trend of water quality state variables. Based on the FVCOM(An Unstructured Gridite Volume Coastal Ocean Model, a high resolution hydrodynamic model of Lianjiang Sea area in Fujian Province was established. The model can simulate the water level, temperature and flow field of Lianjiang River, Fujian Province, and can simulate chlorophyll a, dissolved oxygen, etc. The spatial and temporal distribution characteristics of water quality state variables such as nutrient and salt, and the zero-dimension model are established by using the WASP(The Water Quality Analysis Simulation program formula. The main results of this paper are as follows: (1) the sea area is a regular semi-diurnal tide type, and the tidal wave propagates mainly from northeast to southwest along the southeast coast of Fujian Province, and the amplitude increases with the approaching to the shore. The isometric and isobaric lines in the same tide map are basically perpendicular to the coastal waters and have the characteristics of counterclockwise rotating standing wave systems. The maximum possible tidal range is basically parallel to the direction of the shoreline, gradually increasing from about 5.5 m to Sansha Bay, the mouth of Xinghua Bay. About 8.5 m, gradually increasing to about 9 m from the mouth of the bay to about 9 m.) the tidal current type in this area belongs to the regular half-day tide type north of Pingtan, the irregular half-day tidal current type to the south of Pingtan, and the study area near the shoreline area. It is shown as a reciprocating current, and in the waters off Xinghua Bay, Pingtan and Minjiang River it appears as a rotating current. The elliptical chart of tidal current shows that the half-day tidal current, The mean absolute error of tide level verification is less than 0.2 m, the mean absolute error of current velocity is less than 0.08 m / s, the mean absolute error of flow direction is less than 30 擄, and the absolute error of temperature is less than 1 鈩，

本文編號：1557854