海口湾遥感研究Ⅱ.沉积参量计算

Remote sensing studies in the Haikou Bay II. Calculation of deposition parameters

利用卫星遥感对同一地区重复成像的特点，采用从海湾不同时相的影像中提取不同潮位的水域面积的方法，建立潮位面算式和采用分层求和的方法建立沉积参量算式。利用沉积参量算式和潮位面算式计算了海口湾两个不同时段的０ｍ以浅的沉积参量：１９６５～１９８４年时段沉积总量为４．８×１０６ｍ３，沉积速率为２．５×１０５ｍ３／ａ：１９８４～１９９０年时段沉积总量为－８．９×１０５ｍ３，沉积速率为－１．５×１０５ｍ３／ａ。

-By making use of the distinguishing features of repetitive imagery of the same area by satellite remote sensing, a method of extracting water areas at different tidal levels from the images of bays at different times was adopted to establish a calculating model for tidal surface and a method of finding a sum by layers was used to establish a calculating model for the deposition parameter. Moreover, by making use of the calcu- lating models for the deposition parameter and for tidal level, the deposition parameter for the sea area less than 0 m was calculated for the Haikou Bay at two different periods of time: during the period of 1965-1984 the total amount of deposits was 4.8x 106m3, and the sedimentation rate was 2.5X105m3/a; during the period from 1984 to 1990, the total amount of deposits was -8.9 X 105m3 and the sedimentation rate was -1.5X 105m3/a.