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1、水利水電技術第47卷2016年第5期基于地震映像的河湖水下拋石精準識別方法佘金煌1,付強2,謝磊磊3,常文凱3,卓越3(I.安徽省·水利部淮河水利委員會水利科學研究院,安徽蚌埠233000;2.水利部淮河水利委員會,安徽蚌埠233000;3.河海大學地球科學與工程學院,江蘇南京210098)摘要:基于水下拋石與圍巖的波阻抗差異,應用地震波數(shù)值模擬軟件Tesseral2一D建立含有水、拋石、填土及基巖的水下拋石模型并對其進行正演模擬。分析了不同震源子波頻率和偏移距時的地震響應特征,最終確定震源子波頻率為600Hz,偏移
2、距為5m的地震數(shù)據(jù)采集參數(shù)。采用一種新型的“輕型氣壓式淺水域全自動觸發(fā)器”震源設備對龍河口水庫水下拋石進行實際探測。實踐表明,地震映像能夠識別拋石層的分布范圍和厚度,與實際情況吻合的較好。這為利用地震映像法實現(xiàn)對淺水域水下目標體的精確識別提供了重要的理論和實踐依據(jù)。關鍵詞:水下拋石;Tesseral2一D軟件;正演計算;彈性波方程;輕型氣壓式淺水域全自動觸發(fā)器doi:10.13928/j.cnki.wrahe.2016.05.029中圖分類號:P631.3文獻標識碼:A文章編號:1000—0860(2016)05.0
3、124—04Methodofseismicimaging·basedaccuraterecognitionofunderwaterriprapofriversandlakesYUJinhuan91,F(xiàn)UQian92,XIELeilei3,CHANGWenkai3,ZHUOYue3(1.Anhui&HuaiheRiverInstituteofHydraulicResearch,Bengbu233000,Anhui,China;2.TheHuaiheRiverCommissionoftheMinistryofWaterR
4、esources,Bengbu233000,Anhui,China;3.SchoolofEarthSciencesandEngineering,HohaiUniversity,Nanjing210098,Jiangsu,China)Abstract:Basedonthediscrepancyofwaveimpedancesbetweenunderwaterriprapandsurroundingrock,anunderwaterfiprapmodelthatcontainswater,riprap,earthfill
5、andfoundationrockiSestablishedwiththeseismicwavesimulationsoftwareTesseral2一D,andthentherelevantforwardmodellingismade.Theseismicresponsefeaturesduringvariouswaveletfrequenciesandoffsetsofseismicsourceareanalyzed,thusthedataacquisitionparameters,i.e.theseismics
6、ourcewaveletfrequencyof600Hzandtheoffsetof5m,aredetermined.Withanewtypeofseismicsourceequipment——lightpressuretypeshallowwaterfull—automatictriggerdevice,allactualexplorationismadeontheunderwaterriprapofLonghekouReservoir.Thepracticeshowsthatthedistributionrang
7、eandthicknessofthefipraplayercanberecognizedbyseismicimaging,fromwhichabettercoinci—dencewiththeactualconditionisrealized.Itprovidesanimportanttheoreticalandpracticalbasisforrealizingtheaccuraterecog-nitionoftheunderwatertargetinshallowwaterwiththeseismicimagin
8、gmethod.Keywords:underwaterriprap;Tesseral2一Dsoftware;forwardcalculation;elasticwaveequation;lightpressuretypeshallowwaterfull.a(chǎn)utomatictriggerdevice河湖堤壩在運行過程中,為增強岸坡穩(wěn)定和抗沖刷能力