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《地球物理学进展》2017,(5)
快速、准确地获得土壤含水量信息对农业、水文地质、工程地质和环境科学都具有十分重要的意义.作为中尺度的非侵入型的探测土壤含水量的方法,探地雷达方法受到越来越多的重视,具有广阔的应用前景.本文基于速度分析原理和混合介质介电模型,建立了一套计算土壤含水量的探地雷达数据处理和分析流程.利用提出的数据处理和分析流程对多层水平介质模型的正演模拟数据进行了处理和分析,获得的结果说明了应用此套流程对探地雷达共中心点(CMP)数据估计土壤含水量是适用可行的.然后应用此流程对蒙古国乌兰巴托市水源区域采集的CMP数据进行了处理和分析,并与观测井的信息进行对比,获得了该区域准确的地下水位和土壤含水量信息.正演模拟数据和实测数据处理分析结果验证了探地雷达方法测量土壤含水量的有效性和可靠性. 相似文献
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针对劳雷公司randan不同版本所生成的层厚度数据(.LAY,.CSV)文件在数据处理过程中操作重复性高,过程单调、乏味、效率低的问题,设计并编制探地雷达层厚度值提取应用程序(以后简称"厚度提取宏").分析传统探地雷达层厚度数据(.LAY,.CSV)文件处理的中间过程,确定厚度提取宏具有文件自由选取功能、外部数据导入功能、数据中间处理功能、数据文件批处理功能等共四大功能,设计对应的功能程序模块,编制厚度提取宏.厚度提取宏能一键化批处理一个文件夹下的所有探地雷达层厚度数据(.LAY,.CSV)文件,大幅度提高探地雷达数据文件处理效率.厚度提取宏简单易用,实用性强;将数据处理的中间过程后台化,避免数据文件处理过程中的误操作;相对于传统的层厚度数据处理方法,效率大幅度提高,有三十倍以上的效率优势;厚度提取宏具有拓展功能,如有需要,可拓展到其他探地雷达厂家数据文件的数据处理过程中. 相似文献
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近年来,探地雷达属性技术得到快速发展,并被应用于诸多领域,但在考古领域的应用有待进一步研究。尤其是如何从二维或三维雷达数据体中提取有效属性,对大型文化遗址中不同的考古目标进行解释。我们在云南腾冲南诏古城遗址的调查中,应用了探地雷达技术。为更好地对不同的考古目标体(古城墙、古窑址和古墓葬)进行刻画,我们把采集到的探地雷达资料进行了规范化整理,输入到地震数据处理和解释的工作站,结合考古钻探资料,进行了数据处理和多种探地雷达属性的提取、分析及优化组合,最后应用均方根振幅、平均波峰振幅、瞬时相位和最大波峰时间对三种目标体进行解释。通过对比分析,我们明确了在对不同的考古目标体进行解释时,应该使用不同的属性特征;层位追踪之后进行属性提取和分析的效果要好于普通的等时切片。 相似文献
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探地雷达在探测隐伏活动断层中的应用 总被引：4，自引：0，他引：4
以东昆仑断裂带东部采用探地雷达探测隐伏活动断层为例。 在浅覆盖区, 利用合理的采集参数和数据处理流程; 雷达剖面图像能够清晰地显示出隐伏断层的形态特征和岩土分层; 结合沉积序列, 可以分析和评价断层的活动性。 实验证明, 探地雷达是一种有效探测浅覆盖区隐伏活动断层的方法。 相似文献
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GPR探测地埋管径研究综述 总被引：1，自引：0，他引：1
用无损探测技术来获取地下目标物的信息是当前研究的热点,探地雷达作为一种重要的工具及技术,已广泛应用在地埋管道直径的无损探测中,准确快速测定地埋管的直径,在理论研究与实际应用中都具有重要意义.本文在综合分析电磁波在介质中传播的基本特征和目标回波双曲线特征的基础上,讨论了用探地雷达无损探测技术来获取地埋管的直径特征参数的可行性;介绍了国内外目前主流的探地雷达设备,及相关学者在管径探测方面的研究进展;在国内外典型实例剖析的基础上,介绍分析了不同发展时期探地雷达测定地埋管管径的原理及测定方法;接着对地埋管径无损探测研究工作当前存在的问题进行总结.最后指出,地埋管探测的研究工作,应着眼于实现硬件轻便化、软件专业化、数据处理模型的智能化,才能更好的在实践中加以应用. 相似文献
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以ASTM标准规范为基础对探地雷达（Ground Penetrating Radar 以下简称GPR）的地下探测方法的应用做了比较系统的概述,主要内容包括：部分专业术语的解释;测试过程中雷达探测深度及其中心频率、垂直分辨率、水平分辨率等的关系,测试过程中常见的天线移动方式,以及雷达波速的预测几种方法,数据显示方式;雷达数据解释和数据处理的一般过程及方法.目前我国尚没有关于GPR的国家规范或行业标准,文章对GPR的使用及规范的编制具有一定的参考意义. 相似文献
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基于GprMax正演模拟的探地雷达根系探测敏感因素分析 总被引：3，自引：0，他引：3
应用探地雷达对植物根系进行探测的有效性已得到证实.但由于根系结构复杂,根围环境异质性强,针对基于探地雷达得到的根系探测数据的解读尚处于经验积累阶段.本研究首先通过对比根系探地雷达实测信号图像和模拟信号图像,证实了利用GprMax模拟探地雷达探测植物根系的有效性.其次通过定义不同根系空间结构和电性参数场景,模拟了不同条件下根目标反射信号的差异,并对影响探地雷达探测植物根系有效性的敏感因素进行了初步分析.模拟结果有助于探地雷达野外根系探测图谱的解译,为探地雷达在植物根系探测中的应用积累经验. 相似文献
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地质雷达探测技术已在基础建设工程中得到广泛应用。在研究地质雷达高精度特性时,不能脱离弱异常的精细处理解释。本文探讨了:(1)地质雷达噪声源;(2)雷达资料的精细处理和解释,重点讨论在处理解释中如何达到“精细”的过程。 相似文献
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本文首先通过对波动方程的分析,得出了声波波动方程和雷达波波动方程形式一致性,从而说明了把广泛应用在地震数据处理中的偏移技术引入到GPR资料处理中的可行性;其后说明了时域有限差分法（FDTD）的原理,并用它合成了几种常见的雷达正演剖面;最后利用Kirchhoff积分偏移法对正演所得的雷达剖面进行偏移处理,通过对比偏移处理前后的雷达正演剖面,可知Kirchhoff积分偏移法能使雷达正演剖面中的反射波的归位,绕射波收敛,从而大大地提高了雷达正演剖面的分辨率,更好地指导GPR剖面的地质解释和验证偏移方法的有效性. 相似文献
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An effective bias correction procedure using gauge measurement is a significant step for radar data processing to reduce the systematic error in hydrological applications. In these bias correction methods, the spatial matching of precipitation patterns between radar and gauge networks is an important premise. However, the wind-drift effect on radar measurement induces an inconsistent spatial relationship between radar and gauge measurements as the raindrops observed by radar do not fall vertically to the ground. Consequently, a rain gauge does not correspond to the radar pixel based on the projected location of the radar beam. In this study, we introduce an adjustment method to incorporate the wind-drift effect into a bias correlation scheme. We first simulate the trajectory of raindrops in the air using downscaled three-dimensional wind data from the weather research and forecasting model (WRF) and calculate the final location of raindrops on the ground. The displacement of rainfall is then estimated and a radar–gauge spatial relationship is reconstructed. Based on this, the local real-time biases of the bin-average radar data were estimated for 12 selected events. Then, the reference mean local gauge rainfall, mean local bias, and adjusted radar rainfall calculated with and without consideration of the wind-drift effect are compared for different events and locations. There are considerable differences for three estimators, indicating that wind drift has a considerable impact on the real-time radar bias correction. Based on these facts, we suggest bias correction schemes based on the spatial correlation between radar and gauge measurements should consider the adjustment of the wind-drift effect and the proposed adjustment method is a promising solution to achieve this. 相似文献
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Inversion of swell frequency from a 1-year HF radar dataset collected in Brittany (France) 总被引：1，自引：1，他引：0
This article presents long period ocean wave (swell) frequencies inverted from a 13-month dataset of high-frequency (HF) phased array radars and an assessment of these estimates by comparison with WAVEWATCH III model data. The method of swell frequency inversion from high-frequency radar sea echo Doppler spectra is described. Radar data were collected from a two-site HF Wellen Radar (WERA) radar system on the west coast of Brittany (France) operating at 12 MHz. A standard beam-forming processing technique has been used to obtain Doppler spectra of processed radar cells. Swell frequencies are obtained from the frequencies of particular spectral peaks of the second-order continuum in hourly averaged Doppler spectra. The data coverage of effective Doppler spectra considered for swell frequency estimates shows the influence of islands and shallow water effects. Swell estimates from both radar stations are in good agreement. The comparison of radar-derived results to WAVEWATCH III (WW3) estimates shows that radar measurements agree quite well with model results. The bias and standard deviation between two estimates are very small for swells with frequency less than 0.09 Hz (period >11 s), whereas radar estimates are generally lower than model estimates for shorter swells, along with higher standard deviation. Statistical analysis suggests that radar measurement uncertainty explains most of the difference between radar and model estimates. For each swell event, time series of frequency exhibits a quasi-linear frequency increase which is associated with the dispersive property of wave phase velocity. The use of swell frequency estimates from both radars on common radar cells only slightly increases the accuracy of swell frequency measurement. 相似文献
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High-frequency radars measure projections of surface velocity vectors on the directions of the radar beams. A variational method for reconstruction of the 2d velocity field from such observations is proposed. The interpolation problem is regularized by penalizing high-frequency variability of the surface vorticity and divergence fields. Twin-data experiments are used to assess the method's skill and compare it with two well-known approaches to HFR data processing: conventional local interpolation and more sophisticated non-local scheme known as open-boundary modal analysis (OMA). It is shown that the variational method and OMA have a significant advantage over local interpolation because of their ability to reconstruct the velocity field within the gaps in data coverage, near the coastlines and in the areas covered only by one radar. Compared to OMA, the proposed variational method appears to be more flexible in processing gappy observations and more accurate at noise levels below 30%. 相似文献
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This paper analyses the possibility of using integrated GPS (Global Positioning System) surveys and ground penetrating radar surveys to precisely locate damages to levees, particularly due to the activity of small fossorial mammals. The technology of intercommunication between ground penetrating radar (GPR) and an RTK (Real-Time Kinematic) survey unit, and the method of data combination, are presented. The errors which may appear during the survey work are also characterized. The procedure for processing the data so that the final results have a spatial character and are ready to be implemented in digital maps and geographic information systems (GIS) is also described. 相似文献
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AbstractQuality is key to ensuring that the potential offered by weather radar networks is realized. To achieve optimum quality, a comprehensive radar data quality management system, designed to monitor the end-to-end radar data processing chain and evaluate product quality, is being developed at the UK Met Office. Three contrasting elements of this system are described: monitoring of key radar hardware performance indicators; generation of long-term integrations of radar products; and monitoring of radar reflectivity factor using synthesized observations from numerical weather prediction model fields. Examples of each component are presented and ways in which the different types of monitoring information have been used to both identify issues with the radar product data quality and help formulate solutions are given.
Editor Z.W. Kundzewicz; Guest editor R.J. MooreCitation Harrison, D., Georgiou, S., Gaussiat, N., and Curtis, A., 2013. Long-term diagnostics of precipitation estimates and the development of radar hardware monitoring within a radar product data quality management system. Hydrological Sciences Journal, 59 (7), 1327–1342. http://dx.doi.org/10.1080/02626667.2013.841316 相似文献