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水文要素面平均值的经纬网格计算法 被引量:2
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作者 王树峰 《水文》 CSCD 北大核心 1998年第5期33-36,共4页
推求水文要素面平均值(简称面平均值),是一项既重要又常见的工作内容。根据不同资料与站网情况,常用的方法有算术平均法、泰森多边形法和等值线图法。比较而言,等值线图法与人们对水文要素地区分布的描述相一致,因而已成为一种最... 推求水文要素面平均值(简称面平均值),是一项既重要又常见的工作内容。根据不同资料与站网情况,常用的方法有算术平均法、泰森多边形法和等值线图法。比较而言,等值线图法与人们对水文要素地区分布的描述相一致,因而已成为一种最常用的约定俗成的方法。然而,随着时... 展开更多
关键词 水文要素 面平均值 经纬网格 计算法 投影法
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分区性水文要素面平均值的计算机解算法
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作者 李明担 《水文》 CSCD 北大核心 1998年第2期41-44,21,共5页
本文针对分区性水文要素如降水量、地下水埋深等计算面平均值的问题,提出了一种计算机解法。该方法用矩形网格划分研究区域,利用标志数据文件识别各个分区,应用三角网法、趋势面法等方法求算矩形网格节点值,最终得到各个分区的水文... 本文针对分区性水文要素如降水量、地下水埋深等计算面平均值的问题,提出了一种计算机解法。该方法用矩形网格划分研究区域,利用标志数据文件识别各个分区,应用三角网法、趋势面法等方法求算矩形网格节点值,最终得到各个分区的水文要素的面平均值。经实际验证,效果令人满意。在几种拟合方法中,三角网法具有物理意义明确、使用简便、精度高的特点,为首选之方法。 展开更多
关键词 水文要素 面平均值 矩形网格 三角网 计算机
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面平均地下水位埋深的计算机解法初探
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作者 李明梁 《水文科技信息》 1996年第3期62-66,共5页
本文将研究区域部分为矩形网格,采用趋势面法,距离加权法,方向加权法等计算出矩形网格节点上的地下水位埋深值,应用标志数据文件解决了分区的识别问题,求解出指定分区的面平均地下水埋深。
关键词 面平均值 地下水 水位 计算机 趋势
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Numerical Simulation of the Influence of Mean Sea Level Rise on Typhoon Storm Surge in the East China Sea 被引量:3
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作者 高志刚 韩树宗 +2 位作者 刘克修 郑运霞 于华明 《Marine Science Bulletin》 CAS 2008年第2期36-49,共14页
In this paper, ECOMSED (Estuarine Coastal Ocean Model with sediment transport) model is employed to simulate storm surge process caused by typhoon passing across East China Sea in nearly years. Capability of ECOMSED... In this paper, ECOMSED (Estuarine Coastal Ocean Model with sediment transport) model is employed to simulate storm surge process caused by typhoon passing across East China Sea in nearly years. Capability of ECOMSED to simulate storm surge is validated by comparing model result with observed data. Sensitivity experiments are designed to study the influence of sea level rise on typhoon storm surge. Numerical experiment shows that influence of mean sea level rise on typhoon storm surge is non-uniform spatially and changes as typhoon process differs. Maybe fixed boundary method would weaken the influence of mean sea level rise on storm surge, and free boundary method is suggested for the succeeding study. 展开更多
关键词 Storm surge simulation ECOMSED model East China Sea sea level rise
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塔里木河水主要污染物的探讨
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作者 韩英 阿曼古丽 《新疆农业科学》 CAS CSCD 2002年第2期116-117,共2页
关键词 塔里木河 污染物 采样点 矿化度 Ai值 面平均值 浓度
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The Order of Approximation by(0,1,…,q) Hermite-Fejer Interpolation Polynomials at Nearly Fejer's Points
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作者 沈燮昌 王鸿飞 朱长青 《Chinese Quarterly Journal of Mathematics》 CSCD 1992年第1期81-88,共8页
Suppose that the outer mapping function of domain D has its second continuous derivatives. In this paper, the order proximation by (0,1,…,q) Hermite-Fejer interpolating polynomials at nearly Fejer's points of fun... Suppose that the outer mapping function of domain D has its second continuous derivatives. In this paper, the order proximation by (0,1,…,q) Hermite-Fejer interpolating polynomials at nearly Fejer's points of function of class A(D) are presented. Moreover in general the order of approximation is sharp. 展开更多
关键词 Hermite-Fejer interpolating Fejer's point
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Flexible Calibration Method for 3D Laser Scanner System 被引量:2
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作者 杨中东 王鹏 +1 位作者 李晓慧 孙长库 《Transactions of Tianjin University》 EI CAS 2014年第1期27-35,共9页
In this paper, a flexible high-precision calibration method suitable for industrial field was proposed. The complexity of the coordinate transformation was simplified by choosing the camera coordinate system as the un... In this paper, a flexible high-precision calibration method suitable for industrial field was proposed. The complexity of the coordinate transformation was simplified by choosing the camera coordinate system as the unified reference coordinate system. A flexible planar calibration pattern was introduced to the calibration process, which can be arbitrarily placed and from which the known feature points can be extracted to construct other unknown feature points. With the known intrinsic parameters, the laser projector plane equation was fitted by the multi-noncollinear points, which were acquired through the principle of triangulation and the projective invariance of cross ratio. With this method, the strict alignment and multiple times of coordinate transformation can be avoided. Experimental results showed that the arithmetic mean of the root mean square(RMS) error of distance was 0.000 7 mm. 展开更多
关键词 structured light laser scanner flexible planar target cross ratio CALIBRATION
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