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ID:52175803
大小:1.62 MB
页数:4页
时间:2020-03-23
《基于地震映像的河湖水下抛石精准识别方法.pdf》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、水利水电技术第47卷2016年第5期基于地震映像的河湖水下抛石精准识别方法佘金煌1,付强2,谢磊磊3,常文凯3,卓越3(I.安徽省·水利部淮河水利委员会水利科学研究院,安徽蚌埠233000;2.水利部淮河水利委员会,安徽蚌埠233000;3.河海大学地球科学与工程学院,江苏南京210098)摘要:基于水下抛石与围岩的波阻抗差异,应用地震波数值模拟软件Tesseral2一D建立含有水、抛石、填土及基岩的水下抛石模型并对其进行正演模拟。分析了不同震源子波频率和偏移距时的地震响应特征,最终确定震源子波频率为600Hz,偏移
2、距为5m的地震数据采集参数。采用一种新型的“轻型气压式浅水域全自动触发器”震源设备对龙河口水库水下抛石进行实际探测。实践表明,地震映像能够识别抛石层的分布范围和厚度,与实际情况吻合的较好。这为利用地震映像法实现对浅水域水下目标体的精确识别提供了重要的理论和实践依据。关键词:水下抛石;Tesseral2一D软件;正演计算;弹性波方程;轻型气压式浅水域全自动触发器doi:10.13928/j.cnki.wrahe.2016.05.029中图分类号:P631.3文献标识码:A文章编号:1000—0860(2016)05.0
3、124—04Methodofseismicimaging·basedaccuraterecognitionofunderwaterriprapofriversandlakesYUJinhuan91,FUQian92,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.automatictriggerdevice河湖堤坝在运行过程中,为增强岸坡稳定和抗冲刷能力
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