Neural network for wave forecasting among multi-stations     

Ching-Piao Tsai  Chang Lin  Jia-N Shen 《Ocean Engineering》2002,29(13):1685-1695

Unlike in the open sea, the use of wind information for forecasting waves may encounter more ambiguous uncertainties in the coastal or harbor area due to the influence of complicated geometric configurations. Thus this paper attempts to forecast the waves based on learning the characteristics of observed waves, rather than the use of the wind information. This is reported in this paper by the application of the artificial neural network (ANN), in which the back-propagation algorithm is employed in the learning process for obtaining the desired results. This model evaluated the interconnection weights among multi-stations based on the previous short-term data, from which a time series of waves at a station can be generated for forecasting or data supplement based on using the neighbor stations data. Field data are used for testing the applicability of the ANN model. The results show that the ANN model performs well for both wave forecasting and data supplement when using a short-term observed wave data.  相似文献   

一种准确通用的台风路径预报模式   总被引：1，自引：0，他引：1  

朱敬海  潘杰丽 《海洋预报》2007,24(1):69-74

应用天气学理论,对台风云图的晴空区轴线制约台风移动的规律进行物理解释。根据台风云团与晴空区之间存在的干、湿梯度力和推动台风前进的惯性力的互相关系,建立台风移向预报方程和轨迹预报方程,分析论证了台风移向变化的物理过程,把影响台风移动的复杂因子转化为单一的预报因子。  相似文献   

南亚高压与华南汛期天气     

张淑惠 《台湾海峡》1991,10(1):39-45

本文分析了南亚高压的气候特征及南亚高压月际间振荡与华南汛期天气的关系,结果表明,初夏振荡中心偏北同时偏东,不利华南雨季多雨水;盛夏振荡中心偏北同时偏东,有利华南沿海多台风,并建立了相应的预报判据。  相似文献   

珠江口水域化学耗氧量、溶解氧、无机磷与有机磷的三维水质数学模拟   总被引：12，自引：0，他引：12       下载免费PDF全文

林卫强  李适宇 《海洋学报》2003,25(3):129-137

珠江沿岸城市排污量大,对污染源治理能力十分有限,大量污染物通过河流或直接排放到珠江口,河口区半封闭的地形及潮水顶托使得污染物不易输送出外海,致使珠江口水质恶化,原有海洋生态环境遭到破坏,反过来制约了经济的发展.  相似文献   

Reduction of sand demand for shore protection     

Arved J. Raudkivi  Hans-H. Dette   《Coastal Engineering》2002,45(3-4)

Beach nourishment is an environmentally preferred method of shore protection, but the annual sand requirement may lead to substantial maintenance costs. The shoreline processes, involving the surf zone, beach and dune, are reviewed with the aim of reducing the annual sand requirement of eroding shorelines. It is shown that surf zones with equilibrium profiles, on which the wave energy conversion is evenly distributed across the surf zone, from experience for given conditions indicate least loss of sand. On steep, eroding shorelines it may be difficult to establish an equilibrium profile. For such cases, the use of perched surf zones is recommended, which are supported at the seaward limit by an underwater sill. For reduction of littoral transport, the use of pervious pile groynes is recommended. These are arguably more efficient than impervious groynes. The sand loss from a usually dry beach by raised water levels is shown to be a function of the beach slope and is least when the storm waves at raised water levels do not cut an erosion escarpment. The loss of sand from a dune by infrequent severe storm tides can be prevented with the aid of a built-in membrane. These sand losses are usually large and constitute an uneconomic use of this sand resource. The proposed concepts and measures are linked to existing knowledge, augmented by data from the large wave flume (LWF) in Germany and field data from the North and Baltic Sea coasts.  相似文献   

基于非等间距模型的建筑物沉降预测方法研究   总被引：6，自引：0，他引：6  

吴清海 《测绘科学》2008,33(3):59-61

该文基于实测资料进行建筑物沉降预测。在灰色模型和泊松曲线模型理论的基础上,引入对非等间距数列进行变换处理的方法,从而建立了非等间距预测模型。结合建筑物沉降监测资料进行分析比较,结果表明,两种预测方法均能较好地反映建筑物的沉降趋势。  相似文献   

变形监测信息管理系统的设计与实现   总被引：1，自引：0，他引：1  

程玉书 《测绘信息与工程》2008,33(3):31-33

介绍了GIS数据管理与图形显示的优势、组件技术,设计了变形监测数据管理系统平台,实现了变形监测数据的智能化管理、分析与预测.  相似文献   

吉林省煤炭资源供需形势及对策     

刘颖鑫  吴克平  鲁艳平 《吉林地质》2008,27(3)

煤炭工业可持续发展必须有煤炭资源作为基础和支撑。近年来我省煤炭资源开发强度大,尚未利用资源中可供建井的资源、储量严重不足,受我省煤炭资源聚煤规律、赋存总量、地质条件和主要预测区勘查程度低等条件的限制,资源勘查形势严峻。通过对吉林省煤炭资源开发情况、煤炭供需形势及预测和存在的突出问题进行分析、研究,提出建议和对策以加大、加快地质勘查力度,保证煤炭资源的接续和供给。  相似文献   

加固需求度分析在某水电站右岸边坡的应用     

和海芳  祝介旺  伍法权  贺可强 《工程地质学报》2008,16(4):512-517

边坡工程需要合理确定加固区与非加固区,在施工过程中,要动态调整设计方案。加固需求度方法将影响边坡稳定的主要因素与现场实际的位移监测结果结合起来,依靠专家经验知识,能够得到比较好的结果。在边坡加固需求度的基础上,引入影响权值,对某水电站右岸边坡稳定性进行分析,计算出一段位移监测期内边坡各部分的加固需求程度,得到了比较好的应用。  相似文献   

碳中和目标下关键矿产在清洁能源转型中的作用、供需分析及其建议          下载免费PDF全文

王欢  马冰  贾凌霄  于洋  胡嘉修  王为 《中国地质》2021,48(6):1720-1733

在"碳中和"目标的驱动下，全球能源系统向清洁化、低碳化甚至无碳化发展已是大势所趋。针对向清洁能源转型的需求，采用了统计对比、分类汇总、综合分析等方法，分析研究了关键矿产在电池、电网、低碳发电和氢能等行业中的作用和需求。结合当前关键矿产产量的地理集中度高、项目开发周期长、资源质量下降等矿产供应和投资计划不能满足清洁能源转型的需求等问题，提出确保关键矿产多样性供应，推动价值链各环节的技术创新，扩大回收利用，增强供应链弹性和市场透明度，将更高的环境、社会和治理标准纳入主流程及加强生产者和消费者之间的国际合作等建议。  相似文献