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Abstract.A short description of the new discipline Hydroinformatics is given, together with applications of Hydroinformatics to the fields of Vietnam:-Surface water modelling.-Salinity intrusion modelling.-Water quality modelling.-Ground water modelling.Remarks on several interesting features of computations are also included.Torn tlit. So' do ve ng an h Hydroinformatics duoc gi6'i thieu cling vo'i cac iing dung da c6 t ai Vi~t Nam trong Iinh v u'c me hrnh h6a cac tinh to an dong chdy mat , xam nh ap man, chat lu'ong mro'c va mro-c ngarn.Nhirrig d~c trung dang liru y trong cac tinh toan cling du'o'c de c~p cho timg me hlrih. -Cac phrrcmg ph ap so (numetical methods). KHAI QuAT VE HYDROINFORMATICS-Mo hrnh toan (numerical modelling).Nhu:ng net chinh trong su' ph at trie'n cii a phiro'ng lnro'ng nay di du'o'c trlnh bay trong [1). Chang h an , trong viec danh gia khoi hrong mro'c va cac nguon t.ai nguyen mroc 0' cac dai ven bie'n, vide xac dinh ph an bo cu a t5ng hrorig mro'c qua canh t ir thrro'ng nguon dua ve cimg vo i t5ng lu'ong mro c mira t ai ch6 sinh ra doi hoi su ph an tieh chi tiet ve cac dong ch ay kh ac nhau nhir dong ch ay mat, dong ch ay ngam v a su: nhie m man cua cac song trong mira kiet , khi m a che d9 thuy van chiu anh hiro'ng m anh me cu a t.huy trieu, Viec xfiy d u'ng va su: dung UtC mo hinh nay la su' Ht hop cong sire cua nhieu nh a toan hoc va cong ngh~Vi~t Nam trong tat d 4 Iin h v1).'ctien than cii a Hydroinformatics, trong do co s1).'dong gop t ir nhiing ng ay dau cu a hai t ac gilt sau cu a bai b ao nay. (Xem ket qui tinh t o an va quan tr~c trong hl.nh 1).2,1. Cac m o hinh toari chii yeu da dtro'c ap dung 2,1.1. Tinh t oan dong chdy (mat.)Day la mo hinh dtro c ling dung n hieu nhat va thanh cong nhat.

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