Luận văn thạc sĩ Kỹ thuật công trình biển: Ứng dụng mô hình Xbeach trong đánh giá hiệu quả giảm sóng của rừng ngập mặn ở vùng ven biển Việt Nam

ĐẠI HỌC QUỐC GIA THÀNH PHỐ HỒ CHÍ MINH

ĐẠI HỌC BÁCH KHOA THÀNH PHỐ HỒ CHÍ MINH

NGUYỄN KIỆT

ỨNG DỤNG MÔ HÌNH XBEACH TRONG

ĐÁNH GIÁ HIỆU QUẢ GIẢM SÓNG CỦA RỪNG NGẬP MẶN Ở VÙNG VEN BIỂN VIỆT NAM

CHUYÊN NGÀNH: KỸ THUẬT CÔNG TRÌNH BIỂN

LUẬN VĂN THẠC SĨ

Tp Hồ Chí Minh, tháng 10 năm 2020

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Abstract:

Mangroves play an important role in protecting the coast naturally against storm surges, sea level rise and coastal erosion by dissipating significant amounts of wave energy Therefore, conducting research on the mechanism of wave interaction through mangroves is really necessary to assess the ability and effectiveness wave reduction of mangrove

In this study, the reduction of the incident wave height was investigated using the XBeach 1D numerical model to solve the wave action balance and the shallow water equation In particular, the study focuses on factors that significantly influence hydrodynamic interactions with the existence of mangroves, by running a series of XBeach models with different parameters of wave conditions, the characteristics of mangroves and bottom topography The study will present some results using XBeach 1D numerical model to analyze the wave height attenuation by mangrove strips in Bac Lieu province The results show that the factors that most affect the mangrove wave reduction effectiveness are forest density, forest bandwidth, incoming wave height and water depth In addition, the wave attenuation ratio of the interested area also reaches the maximum values of 8.9x10-3, 7.8x10-3 and 3.3x10-3 (m-1) respectively, for the dense, medium and sparse forest.

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7ӯQKӳQJNӃWOXұQWUrQFKRWKҩ\YLӋFVӱGөQJFk\QJұSPһQ QKѭPӝWJLҧL SKiSEҧRYӋEӡELӇQFKӕQJOҥLFiFUӫLUR WӯWKLrQWDLÿmWUӣQrQUҩWFҩSWKLӃWWURQJOƭQKYӵFQJKLrQFӭXtìm ra các JLҧLSKiSWӕLѭX EҧRYӋEӡELӇQ

1.1.2 5ӯQJQJұSPһQ

1.1.2.1 0ұWÿӝYjNKXYӵFSKkQ EӕUӯQJQJұSPһQ

Hình 1.1 ± PKkQEӕUӯQJQJұSPһQWUrQWKӃJLӟL (National Geographic Magazine, 2007)

5ӯQJQJұSPһQSKkQEӕWUrQWRjQWKӃJLӟLQKѭQJFKӫ\ӃXӣ FiFNKXYӵFQJұSWULӅX và FiFNKXYӵF ven EӡELӇQ FyNKtKұXQKLӋWÿӟLYjFұQQKLӋWÿӟL5ӯQJ QJұSPһQFyGLӋQWtFKNKRҧQJNP2 WUrQWRjQWKӃJLӟL (Giri C., Ochieng E., 2011) Theo Hình 1.1 và Hình

1.2, UӯQJQJұSPһQSKkQEӕFKӫ\ӃXӣNKXYӵF7UXQJ0ӻ 1DP0ӻFKkXÒFTrung Phi YjÿһFELӋWOjNKXYӵFĈ{QJ1DPÈ

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1.1.2.2 5ӯQJQJұSPһQӣ9LӋW1DP

9LӋW1DPYӟLEӡELӇQGjLNPKӋWKӕQJV{QJQJzLGj\ÿһFÿmWҥRQrQVӵSKRQJSK~YjÿDGҥQJYӅKӋWKӕQJ510'ӵDYjRFiF\ӃXWӕÿӏDOêNKҧRViWWKӵFÿӏDYjҧQKYLӉQWKiPPӝWVӕQăP +ӗQJ ÿmFKLD5109LӋW1DPUDOjPNKXYӵFFKtQKQKѭVau:

D .KXYӵF I9HQELӇQĈ{QJ%ҳFWӯPNJL1JӑFÿӃQPNJLĈӗ6ѫQ

7URQJNKXYӵFQj\FyWLӇXNKXSKkQEӕ510ÿѭӧF[iFÿӏQKQKѭVDX + 7LӇXNKX7ӯ0yQJ&iLÿӃQ&ӱDÐQJ;

+ 7LӇXNKX7ӯ&ӱDÐQJÿӃQ&ӱD/өF; + 7LӇXNKX7ӯ&ӱD/өFÿӃQĈӗ6ѫQ

.KXYӵc này FyKӋWKӵFYұWQJұSPһQWѭѫQJÿӕLSKRQJSK~QKӳQJORjLFk\ѭXWKӃOj

0ҳP ELӇQ Avicennimarina), ĈkQJ (Rhizophora stylosa), Trang (Kandilia obovata), Sú (Aegiceras corniculatum 9ҽWGBruguiera gymnorrhiza 7UrQÿҩWFKӍEӏQJұSNKLWULӅXcao có hai loài cây ѭX WKӃ Oj *Li Excoecaria agallocha) và Côi (Scyphiphora

hydrophyllacea