tailieunhanh - Đặc điểm địa mạo và tai biến tự nhiên liên quan ở vùng cửa sông ven biển sông Hương

Trên cơ sở tổng hợp tài liệu nghiên cứu mới cho phép nêu lên những đặc điểm địa mạo vùng cửa sông ven biển sông Hương và các tai biến địa chất liên quan. Địa hình vùng cửa sông ven biển sông Hương hình thành và phát triển dưới tác động chủ yếu của các yếu tố chuyển động Tân kiến tạo - hiện đại vỏ Trái đất, động lực biển, sông - biển và sông. | Vietnam Journal of Marine Science and Technology Vol. 19 No. 1 2019 15 29 DOI https 1859-3097 19 1 9421 https jmst Geomorphology and the natural hazard of Huong coastal estuaries Nguyen Cong Quan1 2 Pham Van Hung1 1 Institute of Geological Sciences VAST Vietnam 2 Graduate University of Science and Technology VAST Vietnam E-mail Received 28 March 2017 Accepted 30 December 2017 2019 Vietnam Academy of Science and Technology VAST Abstract The geomorphological features and related geological hazards of the estuarine and coastal area of the Huong river are concluded from latest synthetic data. The estuarine terrain of Huong river was the result of interaction amongst neo and modern tectonic activities with exogenic dynamic factors as marine marine - fluvial and fluvial. The estuary of Huong river is placed on the northwest - southeast neo - modern tectonic Quang Dien - Phu Vang depressed plate which has 3 local depressed blocks where then were filled by marine marine - fluvial and fluvial sediment. The marine sediment was mostly distributed on the northwestern and southeastern blocks while the central block was mostly filled by marine - fluvial sediment. The terrain of coastal and estuarine area of Huong river had 18 types they have changed dramatically within spatial and sequential dimension for those periods Pliocene - early Pleistocene middle - late Pleistocene early - middle Holocene and late - modern Holocene. During Pliocene - early Pleistocene and middle-late Pleistocene weak uplifting movement to the north of the area had created the denudation surfaces erosion and abrasion terraces with heights over 20 m whereas the depressed area to the east had been filled by several hundred meters of fluvial and fluvial - marine sediment. In the early - middle Holocene depressing movement and retrogradation caused the marine and fluvial - marine sediment accumulated rapidly up to tens of meters. In the last .