考虑浮游生物量损失的疏浚船舶选型方法研究

Research on method of dredging vessels selection based on plankton biomass loss

疏浚工程施工产生的悬浮物会对周围海域的浮游生物造成不利影响。文章通过建立近海悬浮物的二维输移扩散模型,研究不同类型、疏浚效率的挖泥船作业中心的悬浮物浓度,结合悬浮物浓度变化量与浮游生物量损失的关系,构建基于浮游生物量损失的挖泥船选择模型。以某一基槽疏浚工程为例,当采用抓斗式挖泥船进行疏浚工程施工时,研究施工期间疏浚工程对浮游生物量损失的影响,在仅考虑浮游生物量损失的条件下,为疏浚工程施工选用合理疏浚效率的挖泥船。研究结果表明,在施工工期允许的条件下应选择疏浚效率较小的挖泥船,以减少疏浚悬浮物对浮游生物的影响。

The suspended substance（SS） produced by dredging engineering construction can produce adverseinfluence on the aquatic organisms in the surrounding sea. Through establishing a two-dimensional model of trans-port and diffusion of SS, the concentration of SS in the operation center of different types and dredging efficienciesof dredgers were studied in this paper. According to the relationship of SS concentration variation and plankton bio-mass loss, a dredger selection model considering the plankton biomass loss was built. A foundation trench dredgingengineering was taken as an example to illustrate the impact of dredging engineering on the plankton biomass lossduring construction period, when carrying out dredging engineering construction by using grab dredger. Consideringthe plankton biomass loss, a decision support for dredger selection in dredging engineering was provided. The re-sults show that dredger with smaller dredging efficiency should be chosen under the condition of allowable construc-tion period, in order to reduce the effect of SS on plankton.