在日常生活中,我们习惯于以海平面为准来测量海平面上的陆上物体的高度。其实,海平面并不平。为什么海平面不平呢?一是涨潮、落潮、风暴和气压高低等因素,使海面始终不能归于平静;二是海底地形的不同,也决定了海面的不平。我们知道,海底不仅分布有巍峨的海底山脉、平缓的海底平原,而且还有许多陡峭的海底深沟。由于受海底地形的影响,一个海区的海面会低于或高于另 In our daily life, we are accustomed to measuring the height of land-based objects at sea level by sea level. In fact, the sea level is not flat. Why is the sea level uneven? One is the tide, ebb, storm and pressure levels and other factors, so that the sea can not always be attributed to calm; Second, the sea bottom of the terrain, but also determines the uneven sea. We know that the seabed is not only distributed with towering sea-level mountains, gentle plains, but also many steep deep seabed. Due to the influence of the seafloor topography, the sea level in one sea area will be lower or higher than the other