计算分析法确定悬移质单沙取样垂线位置

Determination of suspended single sediment sampling perpendicular location by calculation and analysis method

对于悬移质单沙取样垂线位置的确定,通常是选取几次能代表各级水位、各级含沙量的输沙率资料,绘制垂线平均含沙量与断面平均含沙量比值的横向分布图,在图上选择其值最为集中,且等于1处,作为悬移质单沙取样垂线位置。有的站断面含沙量分布较均匀,或在某个区域分布较均匀,其集中的垂线在所设垂线中会有多条出现,仅凭肉眼在图上难以准确找出比值最集中而且在1附近的垂线。文中对这个问题加以探讨,并推荐一种分析的方法。

The common method for determining suspended single sediment sampling perpendicular location is selecting some sediment transport rate data representing different water level and sediment concentration, drawing the transverse distribution map of ratio value of average sediment concentration along perpendicular to average sediment concentration of cross section. The value which is the most concentrated in the graph and equal to 1would be selected as the position of suspended sediment sampling perpendicular. Many concentrated perpendiculars would occur in the given perpendiculars when the distribution of sediment concentration is more uniform in the whole cross section or in some area of the section of the station. In this condition, it is difficult to accurately identify perpendicular with the most concentrated ratio value which is near 1 from the map with the naked eye alone. The paper discusses this problem and recommends an analysis method.