海岸线一旦因为海平面上升而缩小，以海岸线为基准计算的经济区面积也会缩小，很多学者都持这样的观点。

Where coasts recede because of rising seas, so do the baselines from which such zones are calculated, many scholars say.

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首先介绍了高程基准的定义与现状，指出了用验潮站长期平均海平面建立局部高程基准所存在的问题；

First, the defmation and status of height datums is introduced and some problems on the local height datums established by the mean sea level, which is defined by the tide gauge data, are discussed.

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基准面的变化是构造、气候的函数，对于地史时期的滨海盆地，基准面就是相对海平面。

Base level was the function of tectonic movements and climate circles, and base level for coastal basin in geological history was relative sea level.

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