基于无结构有限体积法三维海洋模型，运用内外模态分离法，考虑干湿节点技术，对复杂边界，外海及近岸的数值模拟优势明显-Unstructured finite volume method based on three-dimensional ocean model, internal and external mode separation, consider the dry node technology, the complexity of the border, offshore and ins