简介:Amongexistingremotesensingapplications,land-basedX-bandradarisaneffectivetechniquetomonitorthewavefields,andspatialwaveinformationcouldbeobtainedfromtheradarimages.Two-dimensionalFourierTransform(2-DFT)isthecommonalgorithmtoderivethespectraofradarimages.However,thewavefieldinthenearshoreareaishighlynon-homogeneousduetowaverefraction,shoaling,andothercoastalmechanisms.Whenappliedinnearshoreradarimages,2-DFTwouldleadtoambiguityofwavecharacteristicsinwavenumberdomain.Inthisarticle,weintroducetwo-dimensionalWaveletTransform(2-DWT)tocapturethenon-homogeneityofwavefieldsfromnearshoreradarimages.Theresultsshowthatwavenumberspectraby2-DWTatsixparallelspacelocationsinthegivenimageclearlypresenttheshoalingofnearshorewaves.Wavenumberofthepeakwaveenergyisincreasingalongtheinshoredirection,anddominantdirectionofthespectrachangesfromSouthSouthWest(SSW)toWestSouthWest(WSW).Toverifytheresultsof2-DWT,waveshoalinginradarimagesiscalculatedbasedondispersionrelation.Thetheoreticalcalculationresultsagreewiththeresultsof2-DWTonthewhole.Theencouragingperformanceof2-DWTindicatesitsstrongcapabilityofrevealingthenon-homogeneityofwavefieldsinnearshoreX-bandradarimages.
简介:文章简要介绍了EH-4电导率成像技术的原理,利用其在贵州西线高速公路槽箐头隧道和惠水县团坡水电站引水隧洞的工程地质勘探中,均收到了较好的勘探效果,表明EH-4电导率成像技术具有探测深度大、不受高阻屏蔽、勘探精度及工作效率高等优点。