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通过6条潮间带水准测量剖面,对天津滨海新区潮间带的高程及坡度进行了测量和计算。结果显示:人工岸线(海堤、海防公路等)与滩面交汇处的高程为+0.22m~+0.73m(1956黄海高程);天津潮间带的平均坡度为1.25‰,海河南侧滩面的平均坡度为1.09‰,较北侧1.33‰小,海河北侧从蛏头沽剖面(1.21‰)到大神堂剖面(1.58‰)滩面坡度呈现变大的趋势;结合潮位观测数据,获得了潮间带的出落宽度,永定新河潮间带最宽,为1730~1810m,大神堂潮间带最窄,为1090~1160m。与20世纪80年代对比,滩面已变陡、变窄。进一步的滩面高度与潮位对比发现,滩面与人工岸线交汇处的高程均低于平均高潮位,揭示了海防设施受到海水直接影响的现状。海防设施真正地成了保护城市的唯一屏障,因此应该进一步加高、加固海防设施,提高防灾等级。
The elevation and slope of intertidal zone in Binhai New Area of Tianjin were measured and calculated through six intertidal leveling profiles. The results show that the elevation of the artificial shoreline (seawall, coastal highway, etc.) intersects with the beach surface is + 0.22m ~ + 0.73m (1956 Yellow Sea elevation); the average gradient of Tianjin intertidal zone is 1.25 ‰, The average slope of the surface is 1.09 ‰, which is smaller than 1.33 ‰ of the north. The gradient of the beach surface from the Beitougu section (1.21 ‰) to the Da Shen She par section (1.58 ‰) on the northern side of the Haihe River tends to be larger. Combining with the tide observation data, The width of the intertidal zone, Yongding New River intertidal zone widest, 1730 ~ 1810m, Dachengtang intertidal narrowest, 1090 ~ 1160m. Compared with the 1980s, the beach surface has become steeper and narrower. Further comparison between the beach height and the tide level shows that the elevation at the confluence of the beach surface with the artificial shoreline is lower than the average high tide level, revealing the status quo of the coastal defense facilities being directly affected by seawater. Coast defense facilities have truly become the only barrier to the protection of the cities. Therefore, the coastal defense facilities should be further strengthened to enhance disaster prevention rankings.