Relationship between density current in Lake Biwa and snow at northern part of catchment area of Lake Biwa

这项研究通过在河口使用系泊测井系统测量水温、水流和其他水元素，如电导率、氧气和浊度，来验证来自Ane河的积雪融化水是否作为Biwa湖的密度流。我们发现，与周围的水相比，底部附近的水团具有相对较低的温度、较高的含氧量和较低的电导率。这个水团在河口面上出现了三天。有了这样的特性，这些水既不是地下水(氧气浓度低于湖水)，也不是沿海冷却水(其电导率应与周围的湖水相同，应只出现在早上，不能持续几天)。由此可见，底层的水可能是来自安河的致密流。

This study verifies whether snowmelt water from the Ane River serves as the density current in Lake Biwa by measuring the water temperature, water current, and other water elements such as conductivity, oxygen, and turbidity by using a mooring logging system at the embouchure of the river. We found that the water mass was characterized by a relatively low temperature, high oxygen content, and low conductivity near the bottom as compared to the surrounding water. This water mass appeared at face of embouchure for three days. With such characteristics, this water would be neither underground water(which has a lower oxygen concentration than lake water) nor coastal cooling water(whose conductivity should be the same as the surrounding lake water, and which should appear only in the morning and not last for several days). In conclusion, water at the bottom is possibly the density current originated from Ane River.