Nearshore Topographical Changes and Coastal Stability in Nam Dinh Province, Vietnam

Recently, the coastal zone in Vietnam has experienced more intensive sea attacks due to severe typhoons, climate change, and humsection an activities. Sea level rise has been recorded all along the coast. Moreover, sand exploitation and engineering measures have significantly changed local reliefs and led to apparent sea water level change on the coast of Nam Dinh province. Coastal erosion and sea dike failures have become a serious problem in the region. The site investigation of nearshore topography shows the recent changes to the coast. Hydrodynamic models show that changes of relief and increased wave attacks on dikes. The main reason for sea dike instability is soil erosion due to wave topping; meanwhile, the dikes are stable in terms of sliding. The coast should be reinforced with properly constructed revetments, wave topping preventive measures, and nearshore sand exploitation should be halted.

1. Introduction

2. Materials and Methods

2.1. Topographical Cross Section

2.2. Bathymetry

2.3. Marine and Sediment Data

2.4. Hydrodynamics and Sediment Transport Modeling

2.4.1. Setting up Models

2.4.2. River Boundary

2.4.3. Open Boundary

2.4.4. Calibration and Verification of the Models

3. Results

3.1. Nearshore Topographical Change

3.2. Hydrodynamic Changes

4. Discussion

4.1. E_ects of Sea Level Rise

4.2. Wave Pressure on Seadike Slope

4.3. General Proposal of Adaptive Measures

5. Conclusions

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See detail: Nearshore Topographical Changes and Coastal Stability in Nam Dinh Province, Vietnam

Nguyen Thanh Hung 1, Do Minh Duc 2,*, Dinh Thi Quynh 3 and Vu Dinh Cuong 1
1 Key Laboratory of River and Coastal Engineering, Vietnam Academy for Water Resources, Hanoi 100000,
Vietnam; nthung@vawr.org.vn (N.T.H.); cuongvd.vkhtlvn@gmail.com (V.D.C.)
2 Department of Geotechnics and Infrastructural Development, University of Science,
Vietnam National University, Hanoi 100000, Vietnam
3 Institute of Geotechnology and Environment, Hanoi 100000, Vietnam; quynhdtgeo@gmail.com
* Correspondence: ducdm@vnu.edu.vn; Tel.: +84-966-968-881

Journal of Marine Science and Engineering