FORMATION AND BEHAVIORS OF ANOXIC SALINE WATER IN COASTAL LAGOONS

以日本北海道的春鸟湖和网走湖为例，探讨了死水（缺氧盐水）的形成机理和行为。两个泻湖之间的海水入侵的物理条件是不同的;在春鸟湖，入侵只发生在大潮期间，而在网走湖，它是在每天的高潮期间产生的。然而，这两个湖泊始终具有较低的缺氧盐水。因此，海水入侵的数量可能是有限的相比，湖泊的水量。春鸟湖内假潮不明显。这可能是因为背风设置是不够的，由于能量耗散的风浪在开放的浅水区。在网走湖，内部假潮被观察到，虽然每天的海水入侵频繁，使其模糊。

The mechanism on formation and behaviors of dead water (anoxic saline water) was examined in two coastal lagoons, Lake Harutori and Lake Abashiri, Hokkaido. Physical conditions of sea water intrusion are different between the two lagoons ; in Lake Harutori, the intrusion occurs only during the high spring tide, while in Lake Abashiri, it was generated during the daily high tides. Both of the lakes, however, consistently have the lower anoxic saline water. Hence the amount of sea water intrusion is probably limited compared with the lake water volume. The internal seiche was not obviously observed in Lake Harutori. This is probably because the leeward setup is not enough due to the energy dissipation by wind waves in the open shallow region. In Lake Abashiri, the internal seiche was observed, although the daily sea water intrusion frequently makes it ambiguous.