江苏辐射沙洲海域推移质输沙率计算与分析

根据江苏省辐射沙洲潮流水道33个站次连续两个潮次的潮流、底沙实测资料,利用比较分析与拟合研究方法,对各潮流水道的推移质输沙率进行了计算与分析,明确了辐射沙洲主要潮流水道涨潮、落潮、全潮平均推移质单宽输沙率和输运路线;分析得出了1 m深流速流向和临底层流速、垂线平均流速有很好的线性关系;拟合构建了江苏省辐射沙洲海域主要潮流水道相应的推移质输沙率流速表达的动力关系式。利用4#~20#站位测量数据及对应计算结果计算拟合得出了西洋水道、豆腐渣腰门水道、陈家坞槽水道的推移质输沙率流速关系式。拟合得出了21#~24#站位所在水道的推移质输沙率计算式,得出了沙洲中心浅滩汊道推移质输沙率关系式;发现推移质输沙率流速表达式在辐射沙洲三个不同区域是有差别。最后利用33个测站的水文测量及计算结果得出了辐射沙洲的整个海域的推移质输沙率计算式。推移质输沙率能用流速很好的表达,一是方便于计算应用,二是可反映内在动力机理。

The calculation and analysis on bed load transport rate of Jiangsu radial tidal sands

Based on tide and bottom sediment data for two consecutive tide times of 33 stations tidal channel of Jiangsu radial tidal sands, the paper use the method of comparative analysis and fitting to calculate and analyze bed load transport rate of every tide channel and to make clear main tide channel at flood tide, ebb tide, the whole tide average bed load transport rate per unit width and transport routes and. Analysis it is concluded that the 1m deep in the velocity and direction of flow ,the bottom face velocity and average vertical velocity have a good linear relationship .Fitting to build the corresponding power relation of flow to express the bed load transport rate of main tide channel of Jiangsu radial tidal sands. using #4~#20 stations data and the corresponding calculation results obtained the velocity equation of bed load transport rate fitting the western waterway, the tofu waist gate waterway and chen jia dock channel. Fitting obtained #21~#24 stations where the waterway the velocity equation of bed load transport rate and the relationship of bed load transport rate of the centre shoals Branch Road. Find that there are different on velocity equation of bed load transport rate in three areas. Finally using 33 stations hydrological measurement and calculation results it is concluded that radial tidal sands to the calculation formula of bed load transport rate. Bed load transport rate of the flow can be well expressed by velocity, in one convenient computing applications, the second is to reflect the intrinsic motivation mechanism.