【摘要】 为论证疏港公路对台州湾水域的影响,收集并分析了台州湾及附近海域水文、水下地形等资料,针对台州湾潮流运动特性,建立了大范围平面二维潮流数学模型。利用实测资料从潮位过程、流速流向等方面对数学模型进行了验证计算,模拟台州湾的潮流运动特征。若采用全实堤结构形式,疏港公路建成后,沿公路两侧局部范围的潮动力主要表现为减小,其中南侧减小显著。头门岛南侧原规划港区范围的潮动力减幅均超过5%,其中规划内港池处在潮动力减小20%以上的区域内,潮动力减小10%的等值线在南山岛附近水域。白沙东南侧水域的潮动力仍有微幅增加。位于疏港公路北侧的北洋涂以东附近水域,潮动力明显减小,减幅为5%的等值线在北洋涂围堤4 km以东。头门岛与东矶岛、田岙岛、石坦岛之间的潮汐通道内潮动力有不同程度的增强,增强幅度在2%以上;大竹山北侧水域潮动力增强幅度大于5%的水域面积近22 km2。采用疏港公路开口方案,疏港公路建成后,沿疏港公路的潮动力变化稍大,其它海域潮动力变化强度小。北洋涂东侧海域的潮动力明显减弱,减弱幅度大于5%的区域限于离围垦堤东2 km范围内;以大竹山东北角点为中心,方位角约350°方向,有一带状潮动力减小区,其中减小2%的带宽约1.5 km,减小5%的带状位置离大竹山最远约2.2 km,该流速减小区位于开口区涨潮流的东侧,有淤积趋势;从大竹山到头门岛段疏港公路的北侧,潮动力减小区总体呈"半哑铃"状,其中减小5%的等值线离公路或岛岸窄处仅300 m、宽处也只有700 m左右,该潮动力减小区均为浅水区;头门岛东侧水域和东北侧潮汐通道内的潮动力微幅增加;小竹山附近的潮动力也稍有增加。总体而言,方案没有引起头门岛北侧水域不利于开发建港的潮动力变化。通过对不同疏港公路方案和规划港区方案实施引起的工程海域流场变化和潮动力的分析论证得出,疏港公路全实堤形式会引起规划港区水域的潮流速较大幅度地减弱,在此基础上港区按规划方案建成后,港池和航道均有较严重淤积。疏港公路麂晴山至大竹山段开口2 km、大竹山至头门岛实堤方案有利于保护性开发头门岛港口资源。研究表明,从潮流泥沙角度而言,头门岛北侧水域也具备建港条件。更多还原

【Abstract】 Taizhou Port is an important regional hub port in the mid-coastal area of Zhejiang Province.The existing port infrastructure can no longer meet the requiments of fast developing economy,and thus a port is proposed to be constructed on the north side of the Toumen Island,Taizhouwan Bay.The port will be connected with mainlang via highway.This study includes the structure of the highway,i.e.solid dyke og a combination of dyke and bridge and the impacts of different structure on the flow field of the Taizhouwan Bay.Hydrologic and underwater topographic data are collected and used in the study,and large-range two-dimensional plane mathematical model of the tidal current is built-up and identified with calculation of the process of the tidal level and flow speed and direction with observed data and the movement features of the tidal current in the bay are simulated.The results show that the tidal power on either side of a solid dyke highway decreases and that on the southern side decreases remarkably,with a decrease range of more than 5%,in which the planned inner dock wharf is in an area with a decrease of more than 20%.The contour of 10% decrease of the tidal power lines in the waters near the Nanshan Island.The tidal power at the southeastern side of Baisha Island has a tiny increase.In the area to the north of the highway and east of Beiyangtu,tidal power reduces significantly,with the contour of 5% decrease at 4 km east of Beiyangtu dike.Tidal power in the tidal channel among Toumen,Dongji,Tian’ao,Shitan Islands increases in varying degrees of more than 2%,the water area with an increase of more than 5% at the north side of Dazhu hill is nearly 22 km2.The tidal power along a dike-bridge combination highway will have a slightly greater variation.It decreases remarkably at the east side of Beiyangtu.The area with a decrease range of more than 5% is limited within 2 km to the east of the embankment.There is a zonal power decreasing area centered at the northeastern corner of Dazhu hill at an azimuth of about 350°.The bandwidth of about 2% decrease is about 1.5 km,and the farthest location of a 5% decrease is about 2.2 km frm Dazhu hill.The flow speed decrease area is at the eastern side of the flood-tide current of the bridge part of the highway and there is a deposition trend there.The power decreasing area to the north of the highway from Dazhu hill to Toumen Island is in "half dumbbell" shape.The narrowest part between the 5% decrease contour and the highway or the island is only 300 m widest part only about 700 m,The tidal power decreasing area are all shallow waters.In waters to the east of Toumen Island and in the tidal channel to the northeast of the island the tidal power slightly increases;and that near Xiaozhu hill slightly increases too.Overall,the program does not result in tidal power variation in waters to the north of Toumen Island unfavourable to the port development.Analysis of flow field and tidal power variation for different scheme shows that solid dike highway will result in rather remarkable decrease of the tide-flow speed in the project area,which will lead to serious deposition of the dock wharf and navigation channel.The Port Highway with 2 km bridge between Jiqin hill and Dazhu hill and solid dike between Dazhu hill and Toumen Island is good for the development of port resources.Studies show that from the point of tidal current and silt,the water area to the north of Toumen Island is suitable for port construction.更多还原