论文部分内容阅读
由于无潮区附近具有潮差小、潮流强等特点,因而它对建港的港址选择有重要意义。黄河三角洲以泥沙多而闻名于世,但在口门附近泥沙运动并非到处相同,主要受海洋动力因于的制约,其中以浪、流、潮的影响最为明显。潮流、余流对5米等深线以外海区泥沙的启动和搬运起主要作用(因水较深,浪的影响要比岸边小得多),因此,开展近海区的潮流、余流研究是非常重要的。一般来说,在潮流强的地方,不仅悬移的泥沙难以沉淀,甚至一些原有的沉积物也能在强潮流的作用下,逐渐被搬移他处,因此在强潮流区海底较硬。例如5号桩(119°00′E,38°01′N)的东北方15米水深的地方,潜水员下去埋捕砂器时,必须使用铁铲挖坑。现在黄河口门3米水深处,也是一个强流带,流速可达到120-140厘米/秒。潜水员潜入水下观察,发现那里的海底也很硬。
Due to the characteristics of small tidal range and strong tidal current in the vicinity of no-tidal zone, it is of great significance to the choice of Hong Kong-built port sites. The Yellow River Delta is famous for its large amount of sediment. However, the sediment movement around the gate is not the same everywhere, mainly due to the restriction of the marine power. Among them, the influence of waves, currents and tides is the most obvious. Current and residual currents play a major role in launching and transporting sediment beyond the 5-m isobath (due to the deeper water, waves have a much smaller impact than the shore). Therefore, is very important. Generally speaking, not only the suspended sediment is hard to be precipitated, but also some original sediments can be gradually moved elsewhere under the influence of the strong tide. Therefore, the seabed in the strong tidal current area is harder. For example, at a water depth of 15 meters to the northeast of the No. 5 pile (119 ° 00’E, 38 ° 01’N), the diver must dig a digging shovel while digging the sand trap. Now the mouth of the Yellow River 3 meters deep water, but also a strong flow belt, the flow rate can reach 120-140 cm / s. Divers dive into the water and found that the bottom of the sea is also very hard.