The morphodynamic responses to deposition-promoting projects in island and reef coasts of the Zhoushan Archipelago,China     

Qingzhi Hou  Zhili Wang  Yongjun Lu  Siping Mo 《国际泥沙研究》2017,32(3)

China's island and reef coasts are mainly distributed along the coasts of Zhejiang and Fujian provinces. These areas have favorable deep-water conditions and great development potential. The Zhoushan Archipelago is a typical island and reef coast. In the midst of the islands, there are many tidal channels with high water depth and high current velocity. Daishan Island is located on the northern part of the Zhoushan Archipelago. The sea north of Daishan Island can be characterized as having great water depth (generally between 10 and 20 m), high current velocity (the maximum measured value is about 2 m/s), and hyperconcentrated suspended sediment (annual average concentration under normal weather conditions is about 0.6 kg/m3). Sediment transport is influenced by the co-action of waves and currents. Land reclamation can ease the contradiction between the desire for development and the land resource shortage on island and reef coasts. Land reclamation generally starts from deposition-promoting projects on island and reef coasts with hyperconcentration of suspended sediment with the aim of reducing the reclamation cost. Based on the morphodynamic characteristics of the sea area near north of Daishan Island, a two-dimensional mathematical model was developed to analyze the co-action of current and waves and the model was verified for spring as well as neap tides in 2007 and 2012. The simulated values of tidal stages, tidal current velocities, tidal current directions, and suspended sediment concentration at 15 stations in 2007 and 9 stations in 2012 were in good agreement with the in-situ measured values. Furthermore, the simulated magnitude and pattern of erosion and sedimentation agreed well with the observations. This model was used to evaluate the effects of a proposed siltation scheme on the hydrodynamic environment and morphological change of the study area. The results of this study can inform the protection, development, and utilization of shoal-channels on island and reef coasts, as well provide a scientific basis for comprehensive maritime protection and development.  相似文献   

国土资源基础数据的多源性特征研究          下载免费PDF全文

宋拥军  李玉琳  王峰  张伟 《山东国土资源》2009,25(4)

基于国土资源基础数据的含义，分析多源国土资源基础数据的类型和特点。从数据的表现形式与存在方式两个方面分析多源国土资源基础数据的类型，从静态和动态两个角度对多源国土资源基础数据的特点进行概括，并提出了多源数据的阶段性特点，阐述了国土资源基础数据多源性特征的内涵，为实现国土资源基础数据集成与共享的研究提供基础依据。  相似文献   

Knowledge-guided digital twin modeling method of generating hierarchical scenes for a high-speed railway     

Heng Zhang  Wen Zhao  Zujie Han  Jun Zhu  Qing Zhu  Zhu Xu  Dejun Feng  Yongjun Song  Shufeng Song  Bo Zhang  Fengpin Jia  Yakun Xie  Yushan Quan  Junhu Zhang  Weilian Li 《Transactions in GIS》2023,27(7):2017-2041

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