Kubera ko imihindagurikire y'ikirere itera kwiyongera kw'amazi yo mu nyanja n'inkubi y'umuyaga, inkombe z'inyanja ku isi zihanganye n'ingaruka zidasanzwe z'isuri. Ariko, guhanura neza imihindagurikire y'inkombe biragoye, cyane cyane ibizaba mu gihe kirekire. Vuba aha, inyigo mpuzamahanga ya ShoreShop2.0 yasuzumye imikorere y'ingero 34 z'ibizamini by'inkombe binyuze mu gupima mu buryo butari bwo, igaragaza uko imiterere y'ibishushanyo mbonera by'inkombe ihagaze ubu.

Inkombe ni umupaka uhinduka aho ubutaka buhura n’inyanja, uhora uhinduka bitewe n’imiraba, imiraba, inkubi y’umuyaga n’izamuka ry’amazi yo mu nyanja. Hafi 24% by’inkombe z’umucanga ku isi zisubira inyuma ku kigero kirenga metero 0.5 ku mwaka, kandi mu turere tumwe na tumwe, nko ku nkombe z’inyanja za Amerika, igipimo cy’isuri ku mwaka kirenga metero 20.

Guhanura imihindagurikire y’inkombe biragoye kandi biragoye, bisaba gusuzuma imikoranire y’ibintu byinshi, harimo ingufu z’imiraba, ubwikorezi bw’ibimera, n’izamuka ry’amazi yo mu nyanja. Guhanura neza mu gihe kirekire biragoye kurushaho.

Uburyo bwo guhanura ku nkombe bugezweho bushobora kugabanywamo ibice bitatu: kimwe gishingiye ku buryo bwo kwigana ibintu, nka Delft3D na MIKE21 bishingiye ku buryo bwo gupima amazi n'uburyo bwo gutwara ibintu mu mazi; kimwe ni uburyo bwo guhuza amahame ngenderwaho n'uburyo bushingiye ku makuru, nka CoSMoS-COAST na LX-Shore; ikindi ni uburyo bushingiye ku makuru bushingiye ku makuru bushingiye ku buryo bw'ibarurishamibare cyangwa uburyo bwo kwigira ku mashini, nka LSTM networks na Transformer architectures.

Nubwo hari ubwoko bwinshi butandukanye bw'ingero, kutagira ibipimo ngenderwaho by'isuzuma byagize ingaruka ku kugereranya imikorere. Ni ubuhe bwoko butanga ubuhanuzi bufatika kurusha ubundi? Irushanwa ry'ibizamini byo kutabona rya ShoreShop2.0 ritanga amahirwe meza yo kugereranya imikorere itandukanye.

Irushanwa mpuzamahanga ry’ibizamini by’ubutabona rya ShoreShop2.0 ni uburyo bukomeye bwo gukorana mu bya siyansi. Amakipe yitabiriye amenyeshwa gusa aho ibizamini bibera, ari ryo zina ry’ikigobe cyangwa inkombe. Amakuru y’ingenzi nk’aho biherereye n’izina nyaryo bihishwa kugira ngo hirindwe ko ubumenyi bwabanje bugira ingaruka ku isuzuma ry’icyitegererezo. Byongeye kandi, amakuru abikwa mu ibanga mu bice, aho amakuru yo mu 2019-2023 (igihe gito) na 1951-1998 (igihe giciriritse) abikwa nkana. Hanyuma ibishushanyo mbonera bihanura impinduka zo ku nkombe z’igihe gito n’igihe giciriritse, amaherezo bigasuzuma ukuri kwabyo hakoreshejwe amakuru y’ibanga. Iyi miterere ituma habaho igereranya ry’ibishushanyo mbonera byo ku nkombe mu buryo butazwi na gato.

Amatsinda 34 y’abashakashatsi baturutse mu bihugu 15 yatanze ingero, zirimo ingero 12 zishingiye ku makuru n’ingero 22 zivanze. Aya matsinda yaturutse mu bigo byo muri Leta Zunze Ubumwe za Amerika, Ositaraliya, Ubuyapani, Ubufaransa, n’ibindi bihugu. Ariko, ingero zatanzwe nta ingero z’ubucuruzi nka GENESIS n’ingero zishingiye kuri fiziki za Delft3D na MIKE21.

Igereranya ryagaragaje ko moderi zikora neza cyane mu gihe gito, mu myaka itanu y’iteganyagihe ari CoSMoS-COAST-CONV_SV (model hybrid), GAT-LSTM_YM (model ikoresha amakuru), na iTransformer-KC (model ikoresha amakuru). Izi moderi zageze ku makosa ya kare y’ikigereranyo cya metero 10, angana n’ikosa rya metero 8.9 mu makuru yo ku nkombe z’inyanja. Ibi bigaragaza ko ku nkombe zimwe na zimwe, ubushobozi bw’aba moderi bwo guhanura buri kugera ku nzitizi z’ikoranabuhanga ryo kureba. Birumvikana ko izindi moderi zashoboye kubona neza impinduka zo ku nkombe.

Igitangaje cyagaragaye ni uko icyitegererezo cy’imvange cyakoze nk’icyitegererezo gishingiye ku makuru. CoSMoS-COAST-CONV_SV (icyitegererezo cy’imvange) gihuza imikorere y’umubiri n’ibikorwa byo guhuza, mu gihe GAT-LSTM_YM (icyitegererezo gishingiye ku makuru) ikoresha umuyoboro w’ibishushanyo mbonera kugira ngo ifate isano iri hagati y’ahantu n’ahantu. Icyitegererezo cyombi cyakoze neza.

Ku bijyanye n'iteganyagihe ry'igihe giciriritse, uruhererekane rwa LX-Shore (hybrid models) rutanga iteganyagihe ryegereye cyane amakuru yapimwe. Mu guhuza inzira zo gutwara amazi ku nkengero z'inyanja n'iz'impande, izi models zigumana umutekano mu gihe kirekire mu gihe zigaragaza ibisubizo bihamye ku nkubi z'umuyaga n'amakuru yapimwe. Iteganyagihe ryavuye muri izi models rigaragaza ko inkubi y'umuyaga ikomeye imwe ishobora gutuma inkombe zisubira inyuma by'agateganyo kugeza kuri metero 15-20, kandi gukira burundu bishobora gufata imyaka ibiri cyangwa itatu. Uruhererekane rwa CoSMoS-COAST rutanga umutekano mwiza, mu gihe izindi models zishobora kugira ikibazo cyo kumanuka mu mazi igihe kirekire no gusubiza ibintu mu buryo burenze urugero.

Ibisubizo by'icyitegererezo bigaragaza koireme ry'amakuruni ingenzi mu kugabanya imikorere y’icyitegererezo. Nubwo amakuru ajyanye n’ikoranabuhanga rya satelite areba ahantu hanini, ubushobozi bwayo bwo kumenya igihe ni buke, akenshi buri cyumweru kugeza buri kwezi, bigatuma bigorana gufata uburyo bwo kwihuta nyuma y’imvura. Byongeye kandi, amazi ahita ahinduka bitewe n’izamuka ry’amazi n’amazi, bigatera amakosa y’igihe gito ashobora kugira ingaruka ku iteganyagihe ry’icyitegererezo.

Ubushakashatsi bwagaragaje ko gutunganya amakuru mu buryo bw’ikirere, nko gukoresha uburyo bukomeye bwo kuyungurura bukoresha imiterere ibiri, bishobora kunoza cyane imikorere y’icyitegererezo. Nyuma, ingero z’ibizamini bitarimo ubushishozi zagabanyije amakosa ku kigero cya 15% binyuze mu gutunganya neza amakuru mbere yo kuyatunganya.

Uburyo bworoshye bwo gutunganya ibimenyetso bwa 2D ni uburyo bugezweho bwo gutunganya ibimenyetso bwagenewe gusakaza urusaku mu makuru ya satelite yo ku nkombe z'inyanja. Mu by'ukuri, ni uburyo bwo kuyungurura bushingiye ku buremere buto, kandi bukomeye cyane ku bintu bidasanzwe nk'urusaku rw'umuraba mu mashusho ya satelite.

Ikindi kintu cy'ingenzi mu guhanura icyitegererezo ni ukuri kw'amakuru y'imiraba yo hafi y'inkombe. Muri iki gihe, amakuru y'imiraba afite amakosa atandukanye, harimo amakosa mu guhindura amakuru y'imiraba yo hirya no hino ku nkombe, ivangura riterwa no gukura ibipimo by'imiraba kuri isobath ya metero 10 aho kuba agace kacitsemo ibice, no kudaha agaciro ingaruka z'ibintu bikomeye hakoreshejwe imiterere y'imiraba ya buri munsi. Aya makosa yose ashobora kugira ingaruka ku bipimo by'icyitegererezo.

Ku birebana n'ibizavugwa mu gihe kirekire, inyinshi muri izo moderi zishingira ku itegeko rya kera rya Brownian kugira ngo zigereranye ingaruka z'izamuka ry'amazi yo mu nyanja. Ariko, iri tegeko rifata ko hari ingano y'amazi yo mu nyanja itagira umupaka kandi iringaniye, kandi ryirengagiza ingaruka zo gutwara amazi yo mu nyanja cyangwa ibikorwa bya muntu, nko kugaburira inkombe. Ibi bishobora gutera urwikekwe rukomeye.

Hashingiwe ku nyigisho y’imiterere y’inyanja, itegeko rya Brownian ritanga isano iri hagati yo kuzamuka k’inyanja no gusubira inyuma kw’inkombe. Iyi nyigisho ivuga ko imiterere y’inyanja igumana imiterere y’uburinganire. Uko inyanja izamuka, uko ahantu ho gutura hagenda harushaho kwiyongera bituma iyi imiterere y’uburinganire ihinduka kugira ngo ikomeze kuba ku butaka kugira ngo ikomeze kuba ku rwego rw’inyanja rushya. Kubera iyo mpamvu, iyi nyigisho ivuga ko uko imiterere y’inyanja igenda ihinduka igana ku butaka, urwego rwo hejuru rw’inkombe rurangirika, kandi ibintu byangiritse bishyirwa ku nkombe, bigatuma hasi ku nkombe h’inyanja hazamuka, bityo amazi agakomeza kuba uburebure buhoraho. Itegeko rya Brown riteganya ko gusubira inyuma kw’inkombe bishobora kuba bikubye inshuro 10 kugeza kuri 50 ugereranyije n’ubwiyongere bw’inyanja, bitewe n’aho inkombe iherereye.

Ubu bushakashatsi butanga ishingiro ryo guhitamo ibikoresho bikwiye hashingiwe ku byo ukeneye byihariye. Byongeye kandi, gutunganya amakuru mbere y’igihe ni ingenzi; gutunganya amakuru neza rimwe na rimwe bishobora kugira ingaruka zikomeye kurusha icyitegererezo ubwacyo. Dushingiye ku bunararibonye bwavuye muri ShoreShop 2.0, hashobora gukorwa impinduka ku makuru ya satelite na wave kugira ngo hongerwe uburyo bwo guhanura. Byongeye kandi, ingaruka zitagenzurwa z’inkombe zangiritse mu buryo bw’ubukorano mu iteganyagihe ry’igihe kirekire na zo zishobora kugira ingaruka zikomeye ku musaruro w’iteganyagihe. Byongeye kandi, kutitabira kw’ibyitegererezo by’ubucuruzi nka GENESIS, Delft3D, na MIKE21 ni ikibazo gikomeye.

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