A synthetic assessment method and systematic procedure are developed in this paper based on cloud theory. The calibration results work well in one building site of Bohai Bay. This shows the presented method has advantages of concision and easy-operation, and the randomness and ambiguity can reacted in the assessment procedure, so the assessment results are practical significance.

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The article analyses and predicts the hydrodynamic feature of Tang Shan bay on the basis of Ecomsed model, thus the calculation accuracy is improved. And then it predicts erosion-deposition characteristics of the study sea area.The paper assesses the influence of the artificial island construction in aspects of hydrodynamic and erosion-deposition environment. Research shows that the sea area in the north of the artificial island is deposition area because of sand excavation and the water inside is slightly deposit.

For delimited the marine regional ecological red line, a systematic delimited principle, basis, standard, method and procedure is proposed in this paper. A credible delimited system has been constructed to research the regional ecological red line. In this method, hydrodynamics, environment, ecology and multi-evaluated method are the key factors for delimiting the scope of red line.

In this paper, synthetic evaluation method with nonlinear power function for membership function and systematic procedure are presented with set pair analysis theory. The case study shows the presented method works well in one building site of Bohai Bay and has advantages of concision, easy-operation and high precision, so the evaluation results are credible.