Ukuhlaziywa Kokuthuthwa Kwenqwaba Yamanzi Olwandle NgeLombok Strait
I-Lombok Strait ingenye yemizila yolwandle ebaluleke kakhulu e-Indonesia, hhayi nje kuphela yokuthutha kodwa futhi neyezindawo zolwandle kanye nezindawo zomhlaba wonke. Lo msele uhlukanisa isiqhingi saseBali entshonalanga kanye ne-Lombok empumalanga, futhi uxhumanisa uLwandle i-Flores (ingxenye yamanzi ase-Indonesia aphakathi) noLwandlekazi i-Indian. Ngokwesimo sokugeleza kolwandle, i-Lombok Strait ingenye yezindlela eziyinhloko ze-Indonesian Throughflow (ITF)—ukugeleza kwamanzi amaningi avela ePacific kuya oLwandlekazi i-Indian okudlala indima enkulu ekusatshalalisweni kokushisa, usawoti, kanye namandla ohlelweni lwesimo sezulu soMhlaba. Lesi sihloko sixoxa ngokuhlaziywa kokuthuthwa kwamanzi amaningi olwandle nge-Lombok Strait, kusukela ezintweni ezilawulayo, izici zokugeleza, izindlela zokuhlaziya, kanye nemiphumela yako endaweni ezungezile kanye nemisebenzi yabantu.
1. Indawo yeLombok Strait ohlelweni lwe-Indonesian Throughflow
I-ITF igeleza isuka entshonalanga yePacific Ocean idlule emanzini ase-Indonesia (kufaka phakathi iMakassar Strait, iFlores Sea, kanye neBanda Sea) bese iphuma iye e-Indian Ocean ngezindawo eziningana ezinkulu zokuphuma: iLombok Strait, i-Ombai Strait, kanye neTimor Gap. Phakathi kwalezi zindawo zokuphuma, iLombok Strait ihlukile ngoba incane kodwa ijule kakhulu. Lokhu kujula kuvumela ezinye izinqwaba zamanzi—ikakhulukazi i-thermocline—ukudlula ngempumelelo kunezingqimba ezingajulile. Ngakho-ke, iLombok Strait akuyona nje indlela yokudlula ebusweni, kodwa iwumzila obalulekile wokudluliselwa kwezinqwaba zamanzi phakathi kwezilwandle ekujuleni okuphakathi.
Ngokuvamile, ukuthuthwa kwamanzi amaningi kulo msele kuvame ukuya eningizimu, kusuka oLwandle iFlores kuya oLwandlekazini i-Indian. Kodwa-ke, ukushintshashintsha kwezinkathi kanye nokuguquguquka kwendawo kungabangela ukuguquguquka kwamandla, isakhiwo esiqondile, kanye nokuphambana kwezikhathi ezithile ezingqimbeni ezithile.
2. Umqondo Wokuthutha Okukhulu Kwamanzi: Ukukhishwa, Isivinini, kanye Nesakhiwo Esiqondile
Ukuthuthwa kwamanzi kuvame ukuvezwa njengokukhishwa kwevolumu (m³/s) noma kuyunithi evamile yolwandle, i-Sverdrup (Sv), lapho i-1 Sv = 10⁶ m³/s. Kalula nje, ukuthuthwa ngokusebenzisa isigaba esinqamulayo esinomugqa kungabalwa ngokuhlanganisa ijubane lamanje eliqondile nesigaba esinqamulayo endaweni enqamulayo:
Ezokuthutha (Q) = ∫∫ v(x,z) dA
Lapha, i-v(x,z) iyisakhi sejubane lamanje eliqonde ngqo esigabeni esinqamulayo endaweni evundlile (x) kanye nokujula (z), kuyilapho i-dA iyisakhi sendawo esinqamulayo.
Kodwa-ke, ukuhlaziywa kwezokuthutha akukhona nje ukwazi ukuthi kungakanani ukukhishwa kwamanzi. Isakhiwo esiqondile naso sibalulekile: ukuthi ngabe imisinga enamandla igxile ebusweni, ku-thermocline, noma ihilela ngisho nezendlalelo ezijulile. E-Lombok Strait, lesi sakhiwo sithonywa ukuma komhlaba okuphakeme phansi kolwandle, ukuba khona kwama-sill, kanye nokusebenzisana kwemisinga namagagasi angaphakathi kanye namagagasi.
3. Izici Eziyinhloko Zokulawula: Umehluko Wezimvula, Amagagasi, kanye Nezinga Lolwandle
a) Ithonya Lemvula
Indawo yase-Indonesia ithonywa uhlelo lwezimvula: iNtshonalanga yeMonsoon (cishe ngoNovemba kuya kuMashi) iletha imimoya enamandla evela enyakatho-ntshonalanga, kanti iMpumalanga yeMonsoon (cishe ngoJuni kuya kuSepthemba) ibuswa yimimoya evela eningizimu-mpumalanga. Izimvula ezishintshayo zishintsha amaphethini okucindezela komoya, isiqondiso somoya, kanye nokusatshalaliswa kwamanzi angaphezulu, ngaleyo ndlela zishintsha i-gradient yezinga lolwandle phakathi koLwandle iFlores kanye noLwandlekazi i-Indian. Lokhu kuthambekela kwezinga lolwandle kuyimbangela ebalulekile yokugeleza okumaphakathi kwe-ITF kulo mgwaqo.
Ngesikhathi se-East Monsoon, ukuphakama ogwini oluseningizimu yeJava–Bali–Nusa Tenggara kungaqinisa izimo zolwandle empumalanga ye-Indian Ocean, kuthonye umehluko wobuningi kanye nolwandle, ukuze ezokuthutha zangaphandle ngeLombok Strait zithole ukuqiniswa noma izinguquko zesakhiwo.
b) Ukwehla Nokugeleza Nokuxuba
I-Lombok Strait yaziwa ngamandla ayo okuqina kolwandle. Ukusebenzisana kwemisinga yolwandle ne-topography ejulile kungadala ukugeleza kwamanzi ngaphakathi kanye nokuxokozela, okwandisa ukuxubana okuqondile. Lokhu kuxuba kushintsha izici zobuningi bamanzi: izinga lokushisa kanye nosawoti kungashintsha, ukuhlukaniswa kwamanzi kuyathamba, futhi izakhamzimba ezivela ezingqimbeni ezijulile zingaphakanyiswa.
Amagagasi abangela nokushintshashintsha kokuhamba kwansuku zonke (ngosuku/ngosuku olulodwa). Uma kungahlukaniswanga nengxenye yamanje ephakathi, isignali yokudonsa ingafihla isilinganiso sokuthutha se-ITF.
c) Umehluko ngobuningi kanye nezinga lolwandle
Ukuthuthwa kwamanzi aphakathi kwezizinda akuthonywa umoya kuphela kodwa futhi kuthonywa umehluko ekuminyaneni kwamanzi olwandle (umsebenzi wokushisa kanye nosawoti). Uma isisindo samanzi enyakatho silula noma izinga lolwandle liphakeme kunelaseningizimu, ukugeleza kuvame ukuthuthela eningizimu. Ukwehluka kwe-El Niño-Southern Oscillation (ENSO) kanye ne-Indian Ocean Dipole (IOD) nakho kungashintsha amazinga olwandle lwesifunda, okwenza i-Lombok Strait ibe enye yezindawo ezizwela ukushintshashintsha kwesimo sezulu sonyaka.
4. Indlela Yokuhlaziya Ezokuthutha eLombok Strait
a) Ukulinganisa Okungaphakathi: I-ADCP kanye ne-Mooring
Ithuluzi eliyinhloko lokulinganisa imisinga yi-Acoustic Doppler Current Profiler (ADCP), efakwe emkhunjini (ibhodi lemikhumbi i-ADCP) noma ebekwe endaweni yokubopha (ipulatifomu ehlala isikhathi eside). Izimbobo zivumela ukuqapha okuqhubekayo, okuvumela ukuhlaziywa kokushintshashintsha kwezinkathi, amaza, ngisho nokungalingani kwaminyaka yonke.
Idatha yejubane lamanje ibekwa eceleni kwesigaba esiphambene, ilungiswe ngokushintsha izikhombisi-ndlela zamanje, bese ihlanganiswa endaweni ephambene. Ukuze kuthathwe isakhiwo esiqondile, ama-ADCP ngokuvamile ahlinzeka ngephrofayili yejubane kusukela eduze kobuso kuya ekujuleni okuthile (kuye ngokuthi imvamisa yethuluzi kanye nezimo zamanzi).
b) Ukuhlaziywa kwe-CTD kanye ne-Water Mass
I-CTD (i-Conductivity-Temperature-Depth) isetshenziselwa ukukala usawoti, izinga lokushisa, kanye nobuningi. Nge-CTD, abacwaningi bangabona uhlobo lobunzima bamanzi agelezayo, njenge-thermocline yePacific ephawulekayo, bese behlela ungqimba oluxubile kanye ne-thermocline.
Ukuhlaziywa kwesisindo samanzi kungenziwa futhi kusetshenziswa umdwebo we-T–S (Temperature–Salinity) ukulandelela imvelaphi kanye nezinqubo zokuxuba. I-Lombok Strait, njengendawo yokuxuba enamandla, ivame ukubonisa "umugqa wokuxuba" phakathi kwesisindo samanzi sangaphakathi sase-Indonesia kanye nethonya laseNdiya.
c) Amamodeli Okuzwa Okukude kanye Nezinombolo
Idatha yesathelayithi, njengokuphakama kobuso bolwandle, izinga lokushisa lobuso bolwandle (i-SST), nombala wolwandle (okhonjiswe yi-chlorophyll), kusiza ekubaleni izimo zesifunda ezithinta ezokuthutha. Kodwa-ke, amasathelayithi awakwazi ukubona ngqo imisinga engaphansi komhlaba, ngakho-ke kusadingeka ahlanganiswe nezilinganiso zangaphakathi.
Amamodeli e-oceanographic ezinombolo (isb., amamodeli okujikeleza kwesifunda) angalingisa imisinga enezinhlangothi ezintathu, okuhlanganisa imiphumela yolwandle kanye nokuxubana. Amamodeli awusizo ekugcwaliseni izikhala zedatha, ukuhlola izimo (isb., izinguquko zomoya zesizini), kanye nokuhlola umnikelo weLombok Strait ku-ITF iyonke.
5. Izici Zokugeleza Nokuguquguquka
Ukuthuthwa kwamanzi ngobuningi eLombok Strait ngokuvamile kuqondiswa ukugeleza okuya eningizimu. Kodwa-ke, ukuqina kwawo kuyahlukahluka ngokwezikhathi:
1. Nsuku zonke–masonto onke: kuthonywa kakhulu amagagasi kanye nemicimbi yendawo efana neziphepho noma amagagasi.
2. Okwesizini: okuthonywe izinguquko zemvula ezishintsha amazinga olwandle kanye namaphethini okujikeleza kwamanzi oLwandle iFlores kanye noLwandlekazi i-Indian olusempumalanga.
3. Iminyaka Ephakathi: I-ENSO kanye ne-IOD kungenza buthaka noma kuqinise i-ITF, kushintshe izinga lolwandle olusentshonalanga yePacific, futhi kuthinte ukuphuma kwamanzi ngeLombok Strait.
Ngaphezu kwalokho, ukuba khona kwamagagasi angaphakathi kungabangela ukushaya kwamandla anamandla ekujuleni okuphakathi. Empeleni, lokhu kusho ukuthi imikhumbi-ngwenya, imisebenzi yokuntywila, noma ukufakwa kwezintambo zamanzi-ngwenya kudingeka kucabangele ukuguquguquka kwamanje okungabonakali ngaso sonke isikhathi ebusweni.
6. Imithelela Yezemvelo Nezenhlalo Nezomnotho
Ukuthuthwa kwamanzi akulona nje inani elibalulekile ezifundweni ze-oceanography. Kunemiphumela yangempela:
– Ukusatshalaliswa kwezakhamzimba kanye nokukhiqiza: Ukuxubana ngenxa yokwehla kwamanzi kanye namagagasi angaphakathi kungandisa ukutholakala kwezakhamzimba, okuthinta izintambo zokudla kanye nokudoba.
– Izinga lokushisa lesifunda kanye nosawoti: Izinguquko kwezokuthutha zishintsha isimo samanzi, zithinte indawo yokuhlala ye-biota yasolwandle.
– Isimo sezulu sesifunda: I-ITF idlala indima ekushintshisaneni kokushisa phakathi kwezilwandle, ngakho-ke izinguquko ekuthuthweni ngeLombok Strait zingathinta namaphethini emvula kanye nesistimu yesimo sezulu esizungezile.
– Ukuphepha kokuhamba: Amaza anamandla kanye nokuguquguquka okuphezulu kungathinta imizila yemikhumbi kanye nengozi yezingozi, ikakhulukazi eduze kweziteshi ezincane kanye nezindawo ezinamaza aphezulu kakhulu.
7. Isiphetho
I-Lombok Strait iyisici esibalulekile sohlelo lwe-Indonesian Throughflow, esebenza njengendawo eyinhloko yokukhipha amanzi amaningi ukusuka ePacific kuya e-Indian Ocean. Ukuhlaziywa kokuthuthwa kwamanzi amaningi kulo mfula kumele kubhekele izimvula ezinkulu, amagagasi, amazinga olwandle, kanye nezinqubo zokuxubana okukhulu. Izindlela zokulinganisa ezifana ne-ADCP, i-CTD, ukuqapha i-mooring, ukwesekwa kwesathelayithi, kanye nomodeli wezinombolo kuyahambisana ukuze kukhiqizwe izilinganiso zokuthutha ezinembile nokuqonda izindlela ezizilawulayo.
Ukuqonda kahle ukuthuthwa kwamanzi amaningi ngeLombok Strait kubalulekile ocwaningweni lwesimo sezulu, ukuphathwa kwezinsiza zasolwandle, ukunciphisa izingozi zokuthutha, kanye nokuhlela ingqalasizinda yasolwandle. Njengoba isidingo esikhulayo sedatha yesikhathi eside nenesinqumo esiphezulu, iLombok Strait izoqhubeka nokuba yindawo yokucwaninga yemvelo ebalulekile yezifundo zolwandle e-Indonesia nasemhlabeni jikelele.
