Based on the principle of origin, the southwestern coastal topography of Vietnam is divided into 32 geomorphological units. Coastal and island topography consists of 9 geomorphological units belonging to 4 topographic groups: (i) terrain with the common erosive origin, (ii) plants of marine origin, (iii) mixed river and sea origin, and (iv) waste of biological origin - river and sea. The seabed topography consists of 23 geomorphological units belonging to 3 topographic groups (i) topography of marine origin; (ii) economics of river and sea origin; (iii) marsh-sea accumulation terrain. The topography of a small part of the coastal continent and most islands were formed in the Quaternary period, and the rest of the continental coastal topography and the entire seabed surface of Southwest Vietnam was developed in the Quaternary period, from Late Pleistocene to Holocene.
In this paper, we propose a reversible hiding solution based on secret sharing method using DNA exclusive-NOR (DNA-XNOR) for color images. The DNA-XNOR secret sharing method is used as a secret key matrix to hide and to extract information. We use the mean square error (MSE) to select the optimal embedding value for each pixel. These values will be used to embed the secret information into the image from which we can obtain the highest PSNR value of the embedded images. In our solution, the secret information will be embedded on all three color channels Red (R), Green (G), and Blue (B) of the original image. The proposed algorithm DNA-XNOR is a new method for sharing confidential information in the field of information hiding. Our experimental results show the efficiency of the algorithm and demonstrate its applicability in practice.
This paper presents the results of applying a statistic, remote sensing (RS) technology, and 3D (three-dimensional) numerical model to study and assess the situations and the causes of riverbank erosion of Hau river in An Giang province during the period 2010–2019, chronologically and spatially. The results show that the erosion of the Hau river in An Giang province during the period 2010–2019 has steadily and widely occurred both in seasons. There is a significant difference in the Hau river’s bank changing compared with the popular one in the past. The riverbank erosion process has occurred increasingly, with solid intensity, in a complex way, and even more in the dry season. It is identified that the causes of the erosion are from hydrological characteristics, river flow dynamics, the geological structure, soil characteristics, and the form of the riverbed and economic - social activities. The finding is a scientific foundation to resolve the riverbank stabilization.
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