Ngun gc va hinh thai b vnh bc b mo

HQi Dia Iy , va Hi nguyen M6i trtro'ng Thil'a Thien Hue HQi Dia Iy Vi~t Nam Ngubn g6c va hinh thai b& Vi'nh Sac SQ Abstract Morpho-genetic features of the coasts of Bacbo gulf According to the morpho-genetically coastal classification by Ion in, A.S., Kaplin, A.P, and Medvedev, 1961 the coasts ofBacbo gulfcan be divided in to 10 coastal types namely: A- The group of coast formed by subarial and tectonic processes, and slightly trasformed by the sea: (1)- The type of Dalmatian coast; (2)The type of limon coast; B- The group of coasts formed primarily by non-wave factors: (3)- The type of deltaic coast; (4)- The type of alluvial flats; (5)- The type of clayey and sandy tidal flats, (6)- The type of tropical biochemical corosive coast; C- The group of coasts formed primarily by the wave action: (7)- The type of abrasive bays; (8)- The type of abrasive-accumulative bays; (9)-The type of smoothed abrasive-accumulative coast; (10)The type of alluvial-marine flats.! V.s MOnAU V inh B~c BQ nftm o' ph ia Tay B~c B iSn Dong, pharn vi 16° 12' d€n 21 °54' vi dQ B~c va 105°36' d€n 110°20' kinh dQ Dong, dien tich hon 170.000km2, dQ sau trung binh 46m, chieu dai duong bo tren 2.1 OOkm Vinh tLT011gd6i kin, cac mi;lt Tay, Bac va Dong co boo baa boc, phia Dong Nam me biSn Dong bang mot cira rQng.260 km Vinh can thong v6'i bien.Dong qua eo biSn Quynh Chau rong 20km, dQ sau ngach 118m Trang vinh co kha nhi€u dEW nho, tieu biSu la Cai Bfru, Cat Ba, Tra Ban, Vinh ThIfC, Cai Chien, Ba MLll1, Quan L