基于MATLAB的杭州湾余姚段滩涂时空演变特征分析

Spatio-temporal Evolution Characteristics of Tidal Flat in Yuyao Section of Hangzhou Bay based on MATLAB

为了加强海塘、岸线和滩涂的管理维护,以2012-2021年杭州湾余姚段东、中、西部的20个断面为对象,基于MATLAB对断面年内平均、变化极值、稳定程度进行分析,总结杭州湾余姚段滩涂发展变化规律,指导余姚段河口综合整治规划。结果表明,各个断面以淤积为主,越靠近西边,淤积越大,根据趋势分析,东新断面基本稳定,西新断面未来可能有较大淤积,即西线岸线高程抬高明显。中新断面变化幅度约为3.90m,东新断面最小值变化剧烈,最大变幅6.53m,西新断面最大和最小变化逐渐靠近。2018年是分界年,中新断面和西新断面方差由小变大,东新断面方差由大变小。近十年来,因为围垦工程的影响,杭州湾余姚段滩涂呈现以淤积为主的趋势,其结论可以海塘安澜千亿工程建设提供技术参考。

In order to strengthen the management and maintenance of sea pond, shoreline and tidal flat, taking 20 sections in the east, central and west of Yuyao section of Hangzhou Bay from 2012 to 2021 as the object, the annual average, extreme value of variation and stability degree of the sections are analyzed based on MATLAB, and the development and change law of tidal flat in Yuyao section of Hangzhou Bay is summarized to guide the comprehensive estuary regulation planning of Yuyao section. The results show that each section is mainly silted, and the closer to the west, the greater the siltation. According to the trend analysis, the east new section is basically stable, while the west new section may have large siltation in the future, that is, the elevation of the west shoreline is obvious. The variation range of the central new section is about 3.90m, the minimum variation of the east new section is drastic, the maximum variation is 6.53m, and the maximum and minimum variation of the west new section are gradually close to each other. The boundary year is 2018, with the variance of the Central and western new sections changing from small to large, and the variance of the Eastern New sections changing from large to small. In the past ten years, due to the influence of reclamation projects, the tidal flat of Yuyao section of Hangzhou Bay presents a trend of sedimentation, and the conclusion can provide technical reference for the construction of the Anlan Hundred billion project of Haitang.