Physical and mathematical models are established in order to analyze and calculate the influence of seawater temperature and bubble distribution on conductivity characteristic of ship wake.

Effect of the seawater salinity on the nitrification-denitrification via nitrite pathway;

The influence of seawater salinity,pH,temperature and ammonia nitrogen loading on the shortcut nitrification of simulated sewage was studied.

Experiments were conducted under different seawater salinity conditions to investigate such as the rule of low and middle concentration organics degrading velocity and removal,activated sludge settling characteristics and effect of the temperature on organics degrading velocity when seawater was 20% of the total domestic wastewater.

The impact of sea-water concentration on biologicaloxidation effluent treatment;

Striving to get the maximum cargo carrying capacity and to acquire great economic benefit by use of variations of sea water density in harbours is worth considering by captains and ship operators under the circumstances of sailing safely through shallow waters.

The existent difference between geodetic leveling and tide station is investigated, and this difference comes from the sea level slope, and the sea level slope mechanism caused by ocean current, air pressure and breaking wave is analyzed, the geoid disturbance computed by three dimensional distribution of sea water density is prese.

The calculation method of seawater density by the multi-angle and polarized information was advanced here.

Using TOPEX/ Poseidon satellite altimeter data, and seawater temperature and salinity estimated from WOA98 model, we calculated sea level height variation caused by seawater density change in multi layers.