Motion rules of saltwater border in dry year and wet year in Modaomen waterway by method of trichotomy
Lin Juan · Chinese Journal of Hydrodynamics · 2012
By analyzing a lot of salinity data of Modaomen waterway from 2007 to 2011,which two of them are dry years and the other two are wet years,the motion characteristics of each year by method of the saltwater border map was given.The results of the long time series data of saltwater border using power spectrum analysis show that there is significantly semi-month periodicity and daily periodicity.By the method of trichotomy,the motion rules of saltwater border with single semi-month period were obtained.The results also show that there are the typical motion rules of 0.5‰ saltwater border which are different between the wet year and the dry year.No matter in wet years or dry years the saltwater goes upstream quickly during the neap tide but at different starting points.In wet years 0.5‰ saltwater border goes upstream shorter than in dry years,and it goes downstream almost immediately so that it does not bring disasters of saline water.But in dry years,the 0.5‰ saltwater border stays upstream much longer,so it can cause serious disasters of saline water.