简介：为了在水文中实现区域面雨量的监测及应用,研究面雨量的快速提取方法。首先对雨量雷达的数据格式进行说明,设计了雷达极坐标数据向面雨量栅格数据转换的方法,能够将面雨量数据无缝融合到水文GIS地图中,并采用基于ArcGISEngine二次开发的面雨量提取软件,为测雨雷达进一步在水文中应用提供方法支撑。

简介：TheX-discontinuity,whichappearsatthedepthofapproximately300km,isanimportantseismicinterfacewithpositivevelocitycontrastsintheuppermantle.Detectingitspresenceandtopographycanbeusefultounderstandphasetransformationsofrelevantmantlemineralsunderthehigh-temperatureandhigh-pressurecircumstanceoftheEarth'sinterior.Inthisstudy,wedetecttheX-discontinuitybeneaththeRyukyusubductionzoneusingfiveintermediate-deptheventsrecordedbythedenseAlaskaRegionalNetwork(AK).TheX-discontinuityissuccessfullyrevealedfromtherobustslantstackingofthesecondarydown-goingandconvertingSdPphases.Fromthedepthdistributionofconversionpoints,wefindthattheX-discontinuity'sdepthrangesbetween269kmand313km,withanaveragedepthof295km.Alltheconversionpointsarelocatedbeneaththedown-dippingsideofthePhilippineSeaslab.Fromenergycomparisonsinvespagramsforobservedandsyntheticseismograms,thestrongconvertedenergyismorelikelyfromathinhigh-velocitylayer,andtheS-wavevelocityjumpsacrosstheX-discontinuityareupto5%to8%withanaverageof6.0%.Accordingtopreviouspetrologicalandseismologicalstudies,theX-discontinuitywedetectedcanbeinterpretedasthephasetransformationofcoesitetostishoviteineclogiticmaterialswithintheoceaniccrust.

简介：针对当前f-x域CEEMD分频去噪容易损失倾斜有效信号及Cadzow滤波法秩的大小难以选择等问题,研究了一种f-x域CEEMD结合Cadzow滤波的去噪方法.对原始含噪剖面应用f-x域CEEMD分频处理,利用其在保留水平同相轴方面的优势,将原始剖面分割为水平同相轴剖面和倾斜同相轴剖面.利用Cadzow滤波法通过保留较大的秩和较小的秩分别对水平和倾斜剖面做进一步降噪处理,恢复有效信号,将二者相加得到最终降噪剖面.该方法能恢复在f-x域CEEMD分频去噪中损失的倾斜同相轴,且能优化在应用Cadzow滤波法去噪时对秩大小的选择.数值计算结果证明了该方法的有效性.