Storm surges are cataclysmic natural disasters that occur along the coasts and are usually accompanied by large waves. The effects of coupled storm surges and waves can pose a significant threat to coastal security. Previous laboratory studies on the effects of storm surges and waves on coastal structures have typically utilized steady water levels and constant wave elements. An indoor simulation of the coupled processes of tides and waves is developed by adding a tide generation system to an existing laboratory wave basin to model continuous dynamic tide levels so that tide generation and wave-making occur synchronously in the pool. Specific experimental methods are given, which are applied to further study waves overtopping on artificial sea dikes and coastal flooding evolution under the coupled actions of tides and waves. The results of the overtopping discharge obtained by the test with a dynamic water level are compared with those obtained from steady water level tests and the existing empirical formula. In addition, the impacts of ecological coastal shelterbelts and structures on coastal flood processes and distributions are also investigated. The proposed simulation methods provide a new approach for studying the effects of storm surges and waves on coastal areas. The study also aims to provide a reference for coastal protective engineering.
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Li Yan-ting Zeng Cheng-jie Yi-han Zhao Hu Po Sun Tian-ting Hou Yi-jun Mo Dong-xue Wang Deng-ting 《中国海洋工程》2022,36(3):413-426
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大龙塘金矿除了受层位、构造因素控制外,尤其是地下水中、低温热液改造对矿床的形成有巨大作用;金的富集也与矿石的岩石类型、结构构造,围岩蚀变等有关。 相似文献
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结合逻辑回归方法和元胞自动机模型构建了逻辑回归CA模型,模型中的逻辑回归方法能够很方便地获取影响因子的权重,再设置起止条件等,便可以模拟出溢油的动态变化情况。把模型应用到Deep Spill项目的溢油模拟实验中,结果表明,从模型结果的形态看,模拟结果与检验结果吻合程度较高,能够很好地模拟出溢油扩散与漂移等重要的溢油特性。从统计分析中可知,模拟结果的总精度可达96.8%,Kappa系数达到0.834。 相似文献
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非典型气层由于成因复杂,受储层厚度较薄、围岩的影响及测井仪器分辨率的限制,在测井曲线上表现出许多模糊性,致使三孔隙度和电阻率曲线在气层的敏感性降低,尤其是与气水同层、水层、干层的差异性不大,从而使一系列基于该资料的识别方法对非典型气层的识别无明显效果.而利用多参数测井信息对非典型气层的识别其实质是一个复杂的、非线性的、高维数的模式识别问题,因此可以采用模式识别方法对非典型气层进行识别.而决策树具有学习能力强、学习过程透明、结果可理解性强,能提供友好的人机交互机制,因此以多方面的测井信息为基础,利用决策树提取非典型气层的预测模型,并综合储层实际特征,对预测模型进行修正.实际应用结果表明,决策树提取的预测模型对非典型气层的识别具有较好的效果. 相似文献
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Impacts of native vegetation on the hydraulic properties of the concentrated flows in bank gullies 总被引：1，自引：0，他引：1
SU Zheng-an HE Zhou-yao ZHOU Tao WANG Jun-jie WANG Xiao-yi WANG Li-juan FANG Hai-dong SHI Liang-tao LIU Yi-han WU Zuo 《山地科学学报》2021,(4):907-922
To quantify the impacts of native vegetation on the spatial and temporal variations in hydraulic properties of bank gully concentrated flows, a series of in situ flume experiments in the bank gully were performed at the Yuanmou Gully Erosion and Collapse Experimental Station in the dry-hot valley region of the Jinsha River, Southwest China. This experiment involved upstream catchment areas withone-and two-year native grass(Heteropogon contortus) and bare land drained to bare gully headcuts, i.e., Gullies 1, 2 and 3. In Gully 4, Heteropogon contortus and Agave sisalana were planted in the upstream catchment area and gully bed, respectively. Among these experiments, the sediment concentration in runoff in Gully 3 was the highest and that in Gully 2 was the lowest, clearly indicating that the sediment concentration in runoff obviously decreased and the deposition of sediment obviously increased as the vegetation cover increased. The concentrated flows were turbulent in response to the flow discharge. The concentrated flows in the gully zones with native grass and bare land were sub-and supercritical, respectively. The flow rate and shear stress in Gully 3 upstream catchment area were highest among the four upstream catchment areas, while the flow rate and shear stress in the gully bed of Gully 4 were lowest among the four gully beds, indicating that native grass notably decreased the bank gully flow rate and shear stress. The Darcy–Weisbach friction factor(resistance f) and flow energy consumption in the gully bed of Gully 4 were notably higher than those in the other three gully beds, clearly indicating that native grass increased the bank gully surface resistance and flow energy consumption. The Reynolds number(Re), flow rate, shear stress, resistance f, and flow energy consumption in the gully beds and upstream areas increased over time, while the sediment concentration in runoff and Froude number(Fr) decreased. Overall, increasing vegetation cover in upstream catchment areas and downstream gully beds of the bank gully is essential for gully erosion mitigation. 相似文献
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南黄海西侧的江苏海岸近岸区域,素以地形复杂、潮流强劲、悬沙输运剧烈著称,但是较长期的同步潮位和潮流观测数据仍然缺乏,尤其是在近岸(20 km)浅水(20 m)区域。2014年1月在大丰港附近开展了连续潮位和潮流观测,获得的数据揭示了一系列特征。此地潮汐潮流为正规半日潮,浅水分潮显著。平均潮差为3.05 m,最显著的两个分潮为M2和S2分潮,振幅分别为1.45 m和0.52 m。潮流最显著的半日分潮M2分潮和最显著的浅水分潮M4分潮在沿岸方向上振幅分别为0.84m/s和0.12m/s,在跨岸方向上振幅分别为0.24 m/s和0.01 m/s,沿岸方向占绝对优势。潮波的沿岸传播介于前进波和驻波之间,驻波的特征稍强。M2分潮潮流椭圆最大流(长轴)方向为南偏东7.4°。存在冬季沿岸向北的余流,垂向平均值的大小为2.2 cm/s。以上潮汐潮流特征为该区域海洋物质输运研究提供了基础资料。 相似文献
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影像匹配是计算机视觉及数字摄影测量的核心问题,基于特征的SIFT匹配算法由于其较强的匹配能力和良好的健壮性成为研究的热点.但SIFT算子的多量性及提取特征点维度较高的特点,直接影响了匹配速度.因此,本文利用GPU强大的并行处理能力,就SIFT特征点匹配在GPU上的设计与实现进行了详细的介绍,并通过对比实验说明利用GPU对SIFT特征点进行匹配所带来的优势. 相似文献
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近50年珠江流域降雨多尺度时空变化特征及其影响 总被引：6，自引：1，他引：5
利用珠江流域38个站点54 a日降水资料,采用Kendall非参数检验法、线性回归及空间克里格插值,对多种降雨指数时空变化及影响进行了研究。结果表明:1珠江流域西部年降雨有减少趋势,流域大部分的降雨日数则有增加趋势;2流域降雨具有季度、月份集中性,其中,季度集中性趋于空间均匀化,月份集中性趋向空间极端化;3极端降雨阈值东高西低,全区极端降雨在20世纪60、80年代末有突变现象,P0.01%设计值在21世纪达到最高。综合多尺度降雨时空变化结果进行分析,将珠江流域划分为广东(包括江西)、广西中北部(包括湖南)、广西西南及云贵4个降雨特征区,广东尤其是珠三角地区及广西中北部地区应注重防洪安全,广西西南与云贵地区应注重保障用水安全。 相似文献
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新疆索尔库都克铜钼矿床含矿粗面英安斑岩岩石学、地球化学特征与岩石成因 总被引：2，自引：0，他引：2
位于东准噶尔北缘的索尔库都克铜钼矿床,一直以来被认为属于一个与辉石闪长玢岩有关的层控夕卡岩型矿床。笔者在矿区露天采场及勘探钻孔调查中发现该矿床的成矿母岩可能为粗面英安斑岩,粗面英安斑岩多发育脉状和浸染状铜、钼矿化,且由浅部到深部热液活动逐渐加强,显示其与成矿关系密切：粗面英安斑岩的K2O＋N2O为9．38％～10．3％、K2O／Na2O为2．63～3．17、A／CNK为0．89～0．98,属准铝质、富钾碱性岩系列,为I型花岗岩：微量元素方面,相对富集Rb、Ba和K等大离子亲石元素和强不相容元素（如U和Xh）,有明显Sr、Ti、Nb和Ta的亏损,与岛弧型花岗岩的特征一致：粗面英安斑岩的（87Sr／86Sr）i为0．70100～0．70384,（143Nd／144Nd）j为0．512387～0．512436,CNd（t）为（＋4．8～＋5．8）,T2DM为663～741Ma,显示其可能源于地幔楔部分熔融。 相似文献
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