Abstract
There will be total suspended solids in port dredging, which will affect aquatic organisms and water quality. Therefore, with the Green Port becoming the core concept of port development, it is necessary to consider the impact of dredging on marine ecological environment when selecting dredgers. In this paper, the calculation method of biomass loss caused by dredging is proposed, and the biomass loss is taken as the evaluation index to establish a dredger selection model considering marine ecological environment and dredger performance. The dredger selection model uses the fuzzy synthetic evaluation method based on norm grey relational grade to evaluate and select dredgers quantitatively, avoiding the influence of subjective factors on dredger selection. Finally, the feasibility of dredger selection model is verified by a practical dredging engineering and the results indicate that the dredger selection model can serve as a scientific basis for the construction of ecological port and the protection of marine environment.
Highlights
Dredging is necessary to maintain the water depth of harbour basin and channel and ensure the port navigation
Considering that the selection of dredger is subjective to some extent, the fuzzy synthetic evaluation method based on norm grey relational grade is applied to dredger selection model to make a scientific and comprehensive evaluation and selection of dredger
On the basis of making clear that total suspended solids (TSS) generated by dredging is the main pollutant, the calculation method of biomass loss caused by dredging is put forward, and the biomass loss is taken as the evaluation index to establish a dredger selection model combining the impact of TSS generated by dredging on marine ecological environment and dredger performance
Summary
Dredging is necessary to maintain the water depth of harbour basin and channel and ensure the port navigation. Dredging has a great impact on the marine ecological environment [1], producing a large number of total suspended solids (TSS) that are insoluble in water and can be suspended in sea water for a long time. The production of TSS will lower water quality and affect the marine ecological environment [4]. With a boom of the ecological concept, some studies have been conducted investigating the impact of TSS generated by dredging on the marine ecological environment. The effects of TSS at different concentrations on aquatic organisms were studied by comparing the relationship between TSS concentration and biomass at different dredging stages [5]. The dredging intensity was managed with the aim of improving water quality and reducing the mortality of aquatic organism, but the dredger type and efficiency were not considered [6]. Dredgers are selected from the perspective of economy and efficiency rather than ecology and environmental protection at present [7,8]
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