Nzira dzeMagetsi eDomain Frequency muGeophysics
Introduction:
Kutsvaga zvivakwa zvepasi pevhu uye kuongorora mafambiro enzvimbo kwakakosha pakushandiswa kwakasiyana-siyana kwakadai sekubvisa zviwanikwa, kuongorora zvakatipoteredza, uye kutsanangurwa kwenzvimbo dziri pasi pevhu. Imwe yenzira dzakaomarara dzakaratidza kukosha mukuferefeta uku kushandisa nzira dze frequency domain electromagnetic (FDEM). Chinyorwa chino chinotarisa misimboti, nzira, uye mashandisirwo eFDEM mu geophysics, ichiratidza kukosha kwadzo uye zvakanakira pamusoro pedzimwe nzira dze geophysical.
Nheyo dzeFrequency Domain Electromagnetic Methods:
Nzira dzekushandisa ma frequency domain electromagnetic dzinoshanda zvichibva pamisimboti ye electromagnetic induction. Kana munda we electromagnetic unoshanduka-shanduka panguva ukapinzwa muvhu, unogadzira minda ye secondary electromagnetic kuburikidza ne induction processes mu conductive subsurface materials. Nekuongorora minda iyi ye secondary pama frequency akasiyana, munhu anogona kutsanangura hunhu hwezvimiro zve subsurface.
Maequations aMaxwell, anotsanangura maitiro eminda yemagetsi, anoumba hwaro hwedzidziso dzenzira dzeFDEM. Kunyanya, maequations anotsanangura kuti munda wekutanga (unobva kune chinhu chakagadzirwa) unokonzera sei minda yechipiri mukati memiviri inotungamira, zvichibvumira kuburitswa kweruzivo rwakabatana nekufambisa kubva kuzviratidzo zvekupindura zvakayerwa.
Zvikamu uye Zvishandiso:
Zvishandiso zvakajairika zveFDEM surveys zvinosanganisira transmitter, receiver, uye electronic units dzekuwana nekugadzirisa data. Transmitter inogadzira primary electromagnetic field pa frequency imwe chete kana dzakawanda. Iyi field inopinda pasi pevhu, inosangana nezvinhu zvinofambisa mhepo, uye inokonzera secondary electromagnetic fields.
Chinogamuchira, chakaiswa panzvimbo dzakasiyana-siyana kubva kune chinotumira, chinotora minda yemagetsi inobuda. Chinonyora amplitude uye phase yeminda inokonzerwa kuburikidza nemafrequencies akasiyana. Data logger inozogadzirisa masaini aya, uye ruzivo rwakaunganidzwa runogona kuongororwa kuti ruratidze kugoverwa kwe conductivity pasi pevhu.
Nzira:
Nzira dzakasiyana-siyana dzekushandisa dzinogona kushandiswa muongororo dzeFDEM, zvichienderana nechinangwa uye zvinodiwa pakugadzirisa dambudziko. Nzira huru dzinosanganisira:
1. Kurira Kwemanzwi Kamwe Chete:
Nzira iyi inosanganisira kushandisa frequency imwe chete kuongorora pasi pevhu. Iri nyore uye inokurumidza asi inogona kupa mhinduro isina kujeka, kunyanya munzvimbo dzakaoma dze geology.
2. Kurira Kwemanzwi Akawanda:
Nekushandisa mafrequency akasiyana-siyana, kurira kwemafrequency akawanda kunopa kusimba kwakavandudzwa uye kunoratidza zviri nani ma layers ari pasi pevhu. Kuongorora kutsamira kwemafrequency ekudzikamisa uye kuchinja kwechikamu kunopa ruzivo rwakadzama pamusoro pekuchinja kwe conductivity nekudzika.
3. Kugadzira Magadzirirwo Emagetsi:
Nzira iyi inosanganisira kufambisa chinotumira nechinhu chinogamuchira zvinhu panguva imwe chete munzvimbo yekuongorora kuti pave neruzivo rwakakwana. Kuongororwa uku kunoratidza kusiyana kwemafambiro emagetsi pasi pevhu.
4. Ongororo dzeGrid:
Kuita ongororo dzakarongeka pamusoro pemagadzirirwo egrid kunobvumira kugadzirwa kwemamepu ekufambisa e2D kana 3D. Ongororo dzegrid dzinopa ruzivo rwakakwana nezvekugoverwa kwenzvimbo kwezvinhu zviri pasi pevhu.
Applications:
Nzira dzeFDEM dzinoshandiswa mumabasa akawanda e geophysical, mamwe acho anosanganisira:
1. Kutsvaga Zvicherwa:
Ongororo dzeFDEM dzinoshanda zvikuru pakutsvaga zvicherwa. Zvicherwa zvinofambisa mhepo zvakaita sesulfide zvinosiyana zvakanyanya nematombo akapoteredza, zvichiita kuti zvionekwe kuburikidza nenzira dzeFDEM. Data rema frequency akawanda rinogonesa vanoongorora geophysicists kufungidzira chimiro, saizi, uye kudzika kwezvicherwa zvinogona kuwanikwa.
2. Kuongorora Mvura Yepasi:
Kuziva uye kusiyanisa ma aquifers kwakakosha pakutarisira zviwanikwa zvemvura. Nzira dzeFDEM dzinobatsira kuona huwandu hwema aquifers, kuona hunhu hwe hydraulic, uye kuwana nzvimbo dzine munyu kana dzakasvibiswa mukati memaumbirwo aya ane mvura.
3. Kuongorora Zvakatipoteredza:
Kuongorora zvakatipoteredza kunowanzoda kuona nekutarisa zvinhu zvinosvibisa, zvakaita semapombi anodonhedzwa nemhepo kubva mumarara kana marara emaindasitiri. Nekuda kwekusiyana kwemagetsi pakati penzvimbo dzakasvibiswa nedzisina kusvibiswa, nzira dzeFDEM dzinopa nzira inoshanda yekuongorora huwandu hwekusvibiswa.
4. Ongororo dzezvekuchera matongo:
Ongororo dzeFDEM dzinobatsira vanochera matongo mukuona nekugadzira mapu ezvivakwa zvakavigwa, nheyo, uye zvinhu zvisina kucherwa zvakanyanya. Kuchinja kwekufambisa simba uye kugona kwemagnetic kunowanzosiyanisa zvinhu zvekuchera matongo kubva muvhu nematombo echisikigo.
5. Uinjiniya neKuronga Maguta:
Munzvimbo dzemaguta, nzira dzeFDEM dzinoshandiswa kuongorora pasi pevhu kuti dziongorore zvivakwa uye kuronga. Mainjiniya anoshandisa nzira idzi kuwana zvinhu zvinoshandiswa pasi pevhu, kuyera kudzika kwematombo, uye kuona njodzi dzinogona kuitika dzakadai semakomba kana maburi.
Advantages:
Nzira dzeFDEM dzinopa mabhenefiti akawanda kana tichienzanisa nedzimwe nzira dze geophysical:
1. Hazvipindi muropa:
Kuongorora kweFDEM inzira isingapindi muvhu, zvinoreva kuti haikanganisi pasi pevhu kana kuti haidi kuboorwa. Izvi zvinobatsira zvikuru munzvimbo dzine njodzi nenzvimbo dzinonyanya kukoshesa kuchengetedza.
2. Kuongorora Zvakadzama:
Nekushandisa ma frequency akawanda, nzira dzeFDEM dzinobvumira kuongorora pakadzika kwakasiyana-siyana, zvichipa ruzivo rwakakwana rwepasi pevhu.
3. Kushanda Nenguva Zvakanaka:
Zvichienzaniswa nedzimwe nzira, ongororo dzeFDEM dzinokurumidza kuiswa uye dzinogona kufukidza nzvimbo dzakakura munguva pfupi, zvichiita kuti dzive dzinodhura zvishoma.
4. Kugadziriswa Kwakakwirira:
Kugona kuyera amplitude uye phase variations pa multiple frequency kunobvumira high resolution imagery ye subsurface conductivity variations.
Zvinetso nezvinogumira:
Pasinei nezvakanakira, nzira dzeFDEM dzine matambudziko:
1. Kududzirwa kweData:
Kududzira data reFDEM kunoda maalgorithms epamusoro-soro ekuchinja uye kunzwisisa kwakanaka kwejiyoroji yemuno kuti uchinje mhinduro dzemagetsi kuita mamodheru ane musoro pasi pevhu.
2. Musiyano weKufambisa:
Kushanda zvakanaka kwenzira dzeFDEM kunoenderana zvikuru nekusiyana kwemagetsi anofambisa magetsi. Munzvimbo dzine magetsi akaderera kana akakwira, kusiyanisa zvinhu zviri pasi pevhu kunogona kuoma.
3. Ruzha rwetsika:
Munzvimbo dzemaguta, kukanganiswa kwemagetsi kubva pamagetsi, zvivakwa, nezvimwe zvinhu zvinogona kuomesa kuwanikwa kwedata nekuridudzira.
mhedziso:
Nzira dzekushandisa ma frequency domain electromagnetic dzinomiririra chishandiso chine simba munharaunda ye geophysics. Kugona kwadzo kuongorora pasi pevhu zvisina kupindira, pamwe nekufambira mberi muhunyanzvi hwe multi-frequency, zvinoita kuti dzikwanise kushandiswa zvakasiyana-siyana kubva pakutsvaga zvicherwa kusvika pakuongorora zvakatipoteredza. Sezvo tekinoroji ichiramba ichichinja, kuvandudzwa kwakawanda mukushandiswa kwezvishandiso uye kugadziriswa kwedata kuri kutarisirwa, zvichiwedzera kushanda uye kururama kwenzira dze FDEM mukuferefeta kwakasiyana-siyana kwe geophysical.
