杭州湾金山深槽冲淤演变及其趋势预测
发布时间：2019-02-16 00:01
【摘要】：潮流冲刷槽是河口海岸地区重要的地貌单元,其演变动态直接影响周边涉海工程的安全。基于1972-2011年间共16期水深地形图,建立统一的数字高程模型(DEM),采用经验正交函数方法 (EOF),分析了金山深槽总体的演变特征。EOF分析得到的前3个特征函数反映的冲淤变化区主要位于水深15 m(吴淞基面)以下的深槽区域,演变特征以深槽的南北拓宽及向西延伸为主;典型断面代表的中部深槽、局部深潭以及深槽延伸前缘呈现不同的时空演变特征。采用EOF结合三次样条平滑方法,对金山深槽区域的演变趋势进行预测,认为预测的2020年地形特征与2011年相比,将会延续之前的演变趋势:中部深槽区域拓宽、西部深潭冲淤交替以及深槽前缘继续向西延伸。
[Abstract]:Tidal current scour trough is an important geomorphologic unit in estuarine and coastal area. Based on 16 topographic maps of water depth from 1972 to 2011, a unified digital elevation model (DEM),) was established using empirical orthogonal function method (EOF),). The evolution characteristics of Jinshan deep trough are analyzed. The scour and silt change area reflected by the first three characteristic functions obtained by EOF analysis is mainly located in the deep trough area below the water depth of 15 m (Wusong base surface). The main evolution features are the widening of the deep trough from the north to the south and the extension to the west; The central deep trough, local deep pool and the leading edge of deep trough extension show different temporal and spatial evolution characteristics. By using EOF and cubic spline smoothing method, the evolution trend of Jinshan deep trough area is predicted. Compared with 2011, the topographic features predicted in 2020 will continue the evolution trend: widening deep trough area in the middle part of China. West deep pool scour silt alternately and deep trough front edge continues to extend westward.
【作者单位】： 华东师范大学河口海岸学国家重点实验室;国家海洋局第二海洋研究所国家海岛开发与管理研究中心;
【基金】：国家自然科学基金(41576095;41376068) 河口海岸学国家重点实验室开放基金(SKLEC-KF201503)
【分类号】：P737.1
本文编号：2423828
[Abstract]:Tidal current scour trough is an important geomorphologic unit in estuarine and coastal area. Based on 16 topographic maps of water depth from 1972 to 2011, a unified digital elevation model (DEM),) was established using empirical orthogonal function method (EOF),). The evolution characteristics of Jinshan deep trough are analyzed. The scour and silt change area reflected by the first three characteristic functions obtained by EOF analysis is mainly located in the deep trough area below the water depth of 15 m (Wusong base surface). The main evolution features are the widening of the deep trough from the north to the south and the extension to the west; The central deep trough, local deep pool and the leading edge of deep trough extension show different temporal and spatial evolution characteristics. By using EOF and cubic spline smoothing method, the evolution trend of Jinshan deep trough area is predicted. Compared with 2011, the topographic features predicted in 2020 will continue the evolution trend: widening deep trough area in the middle part of China. West deep pool scour silt alternately and deep trough front edge continues to extend westward.
【作者单位】： 华东师范大学河口海岸学国家重点实验室;国家海洋局第二海洋研究所国家海岛开发与管理研究中心;
【基金】：国家自然科学基金(41576095;41376068) 河口海岸学国家重点实验室开放基金(SKLEC-KF201503)
【分类号】：P737.1
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