三分法研究丰水年和枯水年磨刀门水道咸界运动典型规律

Motion rules of saltwater border in dry year and wet year in Modaomen waterway by method of trichotomy

该文对2007年～2011年四个年度(其中丰水年和枯水年各两年)磨刀门水道的大量观测盐度数据进行了分析,利用咸界图方法得到每年的长时间序列咸界运动特性,通过功率谱分析发现长时间序列咸界运动数据具有很好的半月周期和日周期,并通过三分法,对多个周期数据进行单周期处理分析,得到了磨刀门水道咸界运动半月周期的典型规律。对比分析每年间的咸界运动半月周期规律,发现丰、枯水年的0.5‰咸界半月周期运动存在不同的典型规律:盐水都是在小潮期间快速上溯,但丰、枯水年的盐水上溯起点位置不同,丰水年0.5‰咸界上溯距离近,在上游无滞留,基本没有咸潮灾害,而枯水年0.5‰咸界上溯天数略多,在上游滞留时间长,咸潮灾害严重。

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.