期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
Thin-bed thickness calculation formula and its approximation using peak frequency 被引量:13
1
作者 Sun Luping Zheng Xiaodong Li Jingsong Shou Hao 《Applied Geophysics》 SCIE CSCD 2009年第3期234-240,299,共8页
Quantitative thickness estimation below tuning thickness is a great challenge in seismic exploration. Most studies focus on the thin-beds whose top and bottom reflection coefficients are of equal magnitude and opposit... Quantitative thickness estimation below tuning thickness is a great challenge in seismic exploration. Most studies focus on the thin-beds whose top and bottom reflection coefficients are of equal magnitude and opposite polarity. There is no systematic research on the other thin-bed types. In this article, all of the thin-beds are classified into four types: thin-beds with equal magnitude and opposite polarity, thin-beds with unequal magnitude and opposite polarity, thin-beds with equal magnitude and identical polarity, and thin-beds with unequal magnitude and identical polarity. By analytical study, an equation describing the general relationship between seismic peak frequency and thin-bed thickness was derived which shows there is a Complex implicit non-linear relationship between them and which is difficult to use in practice. In order to solve this problem, we simplify the relationship by Taylor expansion and discuss the precision of the approximation formulae with different orders for the four types of thin-beds. Compared with the traditional amplitude method for thin-bed thickness calculation, the method we present has a higher precision and isn't influenced by the absolute value of top or bottom reflection coefficient, so it is convenient for use in practice. 展开更多
关键词 thin-bed quantitative thickness calculation peak frequency Taylor expansion approximation
下载PDF
An Improved Method Based on Shallow Ice Approximation to Calculate Ice Thickness along Flow-Line and Volume of Mountain Glaciers 被引量:4
2
作者 李慧林 李忠勤 +1 位作者 张明军 李汶峰 《Journal of Earth Science》 SCIE CAS CSCD 2011年第4期441-448,共8页
To evaluate the water storage and project the future evolution of glaciers, the ice-thickness of glaciers is an essential input. However, direct measurements of ice thickness are labo- rious, not feasible everywhere, ... To evaluate the water storage and project the future evolution of glaciers, the ice-thickness of glaciers is an essential input. However, direct measurements of ice thickness are labo- rious, not feasible everywhere, and necessarily restricted to a small number of glaciers. In this article, we develop a simple method to estimate the ice-thickness along flow-line of mountain glaciers. Different from the traditional method based on shallow ice approximation (SIA), which gives a relationship be- tween ice thickness, surface slope, and yield stress of glaciers, the improved method considers and pre- sents a simple way to calibrate the influence of valley wall on ice discharge. The required inputs are the glacier surface topography and outlines. This shows the potential of the method for estimating the ice-thickness distribution and volume of glaciers without using of direct thickness measurements. 展开更多
关键词 improved method shallow ice approximation ice thickness calculation glacier volume calculation mountain glacier.
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部