Incazelo kanye nomsebenzi wamamephu e-Marine Topographic
Amamephu ezindawo zasolwandle—avame ukubizwa ngokuthi amamephu e-bathymetric—amamephu abonisa ukuma kwesisekelo solwandle kanye nokwehluka kokujula kwalo. Ngenkathi amamephu ezindawo zasolwandle asekelwe ezweni ebonisa izintaba, izigodi, kanye nemingcele yokuphakama, amamephu ezindawo zasolwandle abonisa "ukukhululeka" ngaphansi kwamanzi: imisele, imibundu, imithambeka, amathafa angaphansi komhlaba, ngisho nezintaba zasolwandle. Lolu lwazi lwethulwa ngemigqa yezindawo zasolwandle ezijulile (ama-isobath), imibala egqamile, noma izinombolo zokujula, ezisiza abafundi bemephu ukuqonda izinguquko ekujuleni kanye nesakhiwo sesisekelo solwandle endaweni ethile.
Ukuba khona kwamamephu ezindawo zasolwandle kubalulekile ngoba ulwandle lumboza ingxenye enkulu yobuso boMhlaba futhi lusebenza njengendlela eyinhloko yokuhamba, umthombo wezinsiza, kanye nendawo yokuhlala yezindawo ezahlukene zemvelo. Ngaphandle kwemephu efanele, imisebenzi yokuthumela, ukuthuthukiswa kwengqalasizinda yasolwandle, ucwaningo lwesayensi, kanye nemizamo yokunciphisa izinhlekelele kubhekene nezingozi ezinkulu kakhulu kanye nokungaqiniseki. Lesi sihloko sixoxa ngencazelo yemephu yezindawo zasolwandle, izakhi zayo, kanye nemisebenzi yayo eyinhloko emikhakheni eyahlukahlukene.
Ukuqonda Amamephu Ezindawo Zasolwandle
Ngokuvamile, imephu yesimo sendawo yasolwandle iyisithombe esichazayo esibonisa ukuhlukahluka kokujula nokuma kwephansi lamanzi, kokubili olwandle oluvulekile kanye nasemanzini asogwini njengama-bays, ama-straits, kanye nama-estuary. Lawa mamephu angakhiqizwa ngezikali ezahlukene: ezinkulu zezindawo zechweba kanye nemizila yemikhumbi edinga imininingwane ephezulu, kuya kwezincane zemephu yesifunda noma yomhlaba wonke.
Amamephu ezindawo ahlukile kumashadi asemanzini, yize lokhu kokubili kuvame ukuxhunyaniswa. Amashadi okuzulazula agcizelela ulwazi oludingekayo ukuze kube nokuzulazula okuphephile—njengezindawo zezibani, ama-beacon, imingcele yeziteshi, izingozi zokuzulazula, kanye nokujula okuncane—kuyilapho amamephu ezindawo/amanzi agelezayo agcizelela ukubonakaliswa kwesayensi kwaphansi kolwandle. Kodwa-ke, empeleni, imikhiqizo eminingi yeshadi lasemanzini lanamuhla ihlanganisa izinto ezigelezayo nezigelezayo ukuze kusebenze kahle.
Amamephu ezindawo zasolwandle adalwe ngokusekelwe kudatha yokujula etholwe ngokuhlolwa kwe-hydrographic. Izindlela ezisetshenzisiwe ziye zashintsha ngokuhamba kwesikhathi, kusukela ekulinganisweni ngesandla kusetshenziswa imigqa yokuhola, kuya ku-sonar ene-beam eyodwa, kuya kubuchwepheshe be-echosounder ene-multibeam, i-sonar ene-side-scan, i-bathymetry ye-LiDAR yamanzi angajulile, ngisho nokuhlanganiswa kwesathelayithi kanye nomodeli wezinombolo. Njengoba izindlela ziqhubeka, lapho iphansi lolwandle linemininingwane futhi linembile khona, lingadwetshwa imephu.
Izinto Ezisezindaweni Zokumamephu Ezindawo Zasolwandle
Ukuze kufundwe futhi kusetshenziswe kahle, amamephu ezindawo zasolwandle ngokuvamile aqukethe izinto eziningana ezibalulekile, okuhlanganisa:
1. I-Isobath (umugqa we-contour yokujula)
Imigqa exhumanisa amaphuzu anokujula okulinganayo. Ama-Isobath asiza ukubona ngeso lengqondo ukuthambeka phansi kolwandle: imigqa eseduze ikhombisa ukuthambeka okuphakeme, kuyilapho imigqa eseduze ikhombisa ukuthambeka okuthambile.
2. Izibalo namayunithi okujula
Ukujula kuvame ukuvezwa ngamamitha, kodwa amanye amamephu angasebenzisa izinyawo noma ama-fathom. Ulwazi lwe-datum yokujula (isb., i-datum yeshadi) lubalulekile nasekuchazeni.
3. Isikali semephu kanye nokubikezela
Isikali sinquma izinga lemininingwane. Ukuqagela kuthinta ukumelwa kwendawo kanye nesiqondiso, okwenza kube kubalulekile ekuhlaziyweni kwendawo kanye nasekuzulazuleni.
4. Izimpawu nezinganekwane
Isibonelo, izimpawu zamadwala e-coral, ukuphahlazeka kwemikhumbi, izithiyo ezingaphansi kwamanzi, noma izinhlobo ezithile zenhlabathi uma zifakiwe.
5. Izixhumanisi zezwe
I-Latitude kanye ne-longitude kusetshenziswa ukunquma indawo. Kumamephu anamuhla, lawa ma-coordinates ahlanganiswe nezinhlelo ze-GIS.
6. Ukuhlelwa kombala (kumamephu anezihloko)
Amamephu amaningi e-bathymetric asebenzisa okuluhlaza okwesibhakabhaka okukhanyayo emanzini angajulile kanye nokuluhlaza okwesibhakabhaka okumnyama emanzini ajulile, ukuze izinguquko ekujuleni zibonakale kalula ngokubona.
Imisebenzi Yamamephu Ezindawo Zasolwandle
Amamephu ezindawo zasemanzini anemisebenzi ebanzi, ehlanganisa imikhakha ehlukahlukene. Nazi ezinye zemisebenzi yawo eyinhloko.
1. Ukusekela Ukuphepha Kokuthunyelwa Nokuzulazula
Umsebenzi owusizo kakhulu wokudweba amamephu okujula ukuvimbela imikhumbi ukuthi ingaweli phansi noma ishaye izithiyo zangaphansi kwamanzi. Ngokuqonda amaphethini okujula, okaputeni nabahleli bemizila bangakhetha indlela ephephile ngokusekelwe ekuklanyweni komkhumbi. Ulwazi lwe-contour luphinde lusize ekuboneni izindawo eziyingozi njengemifula, izihlabathi, noma imifudlana enemisinga enamandla.
Ezikhumulweni nasezindleleni zokungena emikhunjini, amamephu ezindawo zasolwandle abalulekile ekunqumeni izidingo zokudonsa amanzi, ukubekwa kwe-buoy, kanye nokuhlola izinguquko zokujula ngenxa yokufakwa kwenhlabathi.
2. Ukuhlela Nokuthuthukiswa Kwengqalasizinda Yasolwandle
Izakhiwo ezahlukene zasolwandle zidinga idatha enembile engaphansi kolwandle, njenge:
– ukwakhiwa kwamachweba, amachweba kanye nezindawo zokuvimba amanzi,
– ukufakwa kwezintambo ezingaphansi kwamanzi (ezokuxhumana kanye nogesi),
- ukufakwa kwepayipi likawoyela negesi,
- ukunqunywa kwendawo yama-turbine omoya asogwini,
– ukwakhiwa kwamabhuloho noma imigudu engaphansi kwamanzi.
Ukujula kwesimo kanye nohlobo lomgwaqo ongaphansi kolwandle kusiza onjiniyela ukuthi banqume izindlela, amaphuzu ayisisekelo, futhi balinganisele ingozi yokudilika komhlaba ngaphansi kwamanzi noma ukushintsha kwenhlabathi.
3. Ukusekela Ucwaningo Lwe-Oceanography kanye Ne-Marine Geology
Ukuma kwephansi lolwandle kuhlobene kakhulu nezinqubo ze-geological ezifana nokunyakaza kwepuleti le-tectonic, ukwakheka kwemisele engaphansi komhlaba, izintaba eziphakathi kolwandle, ngisho nomsebenzi wentaba-mlilo ongaphansi kwamanzi. Besebenzisa amamephu e-topographic olwandle, abacwaningi bangenza okulandelayo:
- ukumaka izakhiwo ze-geological kanye namaphutha angaba khona,
– ukufunda umlando wokuziphendukela kwemvelo phansi kolwandle,
– thola indawo lapho kukhona khona imigodi yomoya noma izikebhe zolwandle.
Ngokuphathelene ne-oceanography, i-topography ithonya imisinga yolwandle, amagagasi angaphakathi, kanye namaphethini okujikeleza kwamanzi. Amathambeka nemifudlana ingaqondisa imisinga, ibangele ukukhuphuka, futhi ithonye ukusatshalaliswa kwezinga lokushisa kanye nosawoti.
4. Ukuphathwa Kwezinsiza Zokudoba kanye Nezinhlelo Zemvelo
Izimiso zemvelo zasolwandle zithonywa kakhulu ukuma kwesisekelo samanzi. Amadwala e-coral, imibhede yotshani basolwandle, kanye nezindawo zokuhlala zezinhlanzi zasemanzini zivame ukuhlotshaniswa nokujula nezakhiwo ezithile. Amamephu ezindawo zasolwandle ayasiza:
– nquma izindawo zokudoba ezingaba khona,
– ukuklama izindawo ezivikelwe zasolwandle,
– ukuqapha izindawo zokuhlala ezibucayi,
– hlola umthelela wemisebenzi yabantu (isib. ukudoba ngodobo noma ukubuyisela izinhlanzi) phansi kolwandle.
Ngedatha enhle ye-bathymetric, ukuphathwa kokudoba kungasekelwa kakhulu ngokwesayensi, okuhlanganisa nokunquma izindawo zokuzalela noma imizila yokufuduka kwezinhlobo ezithile.
5. Ukunciphisa Izinhlekelele Zasolwandle
Amamephu ezindawo zaselwandle adlala indima ebalulekile ekunciphiseni ama-tsunami, amagagasi olwandle, kanye nokudilika komhlaba ngaphansi kwamanzi angaphansi komhlaba. Ukuma kwephansi lolwandle kuthonya indlela amandla amagagasi asakazeka futhi aqina ngayo njengoba esondela ogwini. Amamodeli e-tsunami adinga idatha ye-bathymetric ukuze abikezele:
- isivinini sokusabalala kwamagagasi,
- isiqondiso sokusabalala,
– iphuzu lokugxila kumagagasi,
– isikhathi sokufika esilinganiselwe kanye nokuphakama kwamagagasi.
Ngaphezu kwama-tsunami, ukumepha phansi kolwandle kusiza ukuhlonza izindawo ezivame ukudilika komhlaba ngaphansi kwamanzi okungadala amagagasi amakhulu endaweni.
6. Ukuhlela Indawo Yasolwandle kanye Nenqubomgomo Yasolwandle
Umqondo wokuhlela indawo yasolwandle udinga ulwazi oluphelele lwendawo. Amamephu ezindawo zasolwandle ayingqimba yedatha ebalulekile yalokhu:
– ukunquma ukuhlukaniswa kwezindawo zokusetshenziswa kolwandle (ukudoba, ezokuvakasha, imboni, ukulondolozwa kwemvelo),
– ukunciphisa izingxabano zendawo phakathi kwemikhakha,
– hlola ukufaneleka kwendawo yomsebenzi othile ngokusekelwe ekujuleni kanye nokwehla kolwandle.
Uma kukhulunywa ngesimo se-archipelagic, amamephu okujula nawo ahlobene nokutadisha imingcele yendawo kanye nokusetshenziswa kwezinsiza emanzini kazwelonke.
7. Isekela Ubuchwepheshe be-GIS kanye nokumodela kwedijithali
Njengamanje, amamephu e-topographic olwandle atholakala kabanzi ngamafomethi edatha yedijithali, njenge-Digital Bathymetric Models (DBM) noma i-Digital Elevation Models yaphansi kolwandle. Le datha ingacutshungulwa ku-GIS ukuze kukhiqizwe:
– imephu yemithambeka,
- isici sokuthambeka,
– ukuhlaziywa komthamo wenhlabathi,
- ukulingisa kwamanje namagagasi,
– imephu yendawo yokuhlala esekelwe ekujuleni.
Leli khono lenza amamephu e-topographic olwandle angabi izithombe nje kuphela, kodwa futhi abe amasethi edatha okuhlaziya angasiza ekwenzeni izinqumo.
I-Penutup
Imephu yesimo solwandle iyimephu ebonisa ukwehluka kokujula nokususwa kolwandle ngokusebenzisa ama-contour, izibalo zokujula, kanye nezimpawu ezithile. Ukuba khona kwayo kubalulekile ekuphepheni kwemikhumbi, ukuthuthukiswa kwengqalasizinda yolwandle, ucwaningo lwe-geological kanye ne-oceanography, ukuphathwa kwezinhlanzi kanye ne-ecosystem, ukunciphisa izinhlekelele, kanye nokuhlela indawo yolwandle. Ngokuthuthuka kokuhlola i-hydrographic kanye nobuchwepheshe bemephu yedijithali, amamephu esimo solwandle aya ngokuya enemininingwane futhi enembile, ngaleyo ndlela enikeza izinzuzo ezibanzi—kokubili ngezinjongo zomnotho, ukuphepha, kanye nokusimama kwemvelo yolwandle.
Uma ufisa, ngingangeza nezibonelo zezingxenye zemephu (izinganekwane), umehluko phakathi kwamamephu e-bathymetric namamephu okuzulazula, noma ngihlele lesi sihloko ngefomethi ephelele yephepha (isingeniso-ingxoxo-isiphetho-uhlu lwezincwadi).
