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All Journal Journal of Degraded and Mining Lands Management
Pham, Mai Phuong
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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Land management and conservation of the habitat of Bruguiera hainesii C.G. Rogers in Vietnam Pham, Mai Phuong; Hoang, Thi Thu Trang; Nguyen, Xuan Dao; Nguyen, Quoc Khanh; Vu, Dinh Duy
Journal of Degraded and Mining Lands Management Vol. 12 No. 3 (2025)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2025.123.7753

Abstract

Comprehending the bidirectional interactions between ecosystems and plant communities is essential for ensuring the conservation and sustainable development of Bruguiera hainesii. The study identified nine accompanying plant species within a range of 1.2-5.5 m, including five frequently encountered species and four commonly found ones. The research site is influenced by two distinct wind seasons: the Northeast monsoon (November to April) and the Southwest monsoon during the rainy season, with an average wind speed of 1.77 m/s. Correspondingly, the wave regime alternates with these seasons, featuring opposing directions. During the Northeast monsoon, wave heights average 2-2.5 m, while during the Southwest monsoon, they decrease to 1.5-1.7 m. The tidal regime in Con Dao is mixed semi-diurnal, with tidal ranges of 3-4 m at high tide and 1.5-2 m at low tide. Tidal currents primarily drive the flow regime, with dominant Northeast flow during early summer and seasonal shifts between winter and summer. Flow velocities range from 0.15 to 0.92 m/s, influenced by the Manning roughness coefficient. Sediment dynamics reveal that increased settling velocities correlate with higher suspended sediment concentrations, with total suspended sediment at point P1 approximately 70% greater than at point P2. These findings elucidate the seasonal and hourly dynamics of tidal waves and sediment transport, offering critical insights to support the effective conservation of B. hainesii.
Flood disaster risk identification using integrated fuzzy MCDA and GIS in Song Hinh District, Phu Yen Province Tong, Hanh T.; Pham, Mai Phuong; Nguyen, Nga T.T.
Journal of Degraded and Mining Lands Management Vol. 13 No. 2 (2026)
Publisher : Brawijaya University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15243/jdmlm.2026.132.10165

Abstract

This study presents an integrated approach for flood risk zonation using Geographic Information Systems (GIS), which combines spatial multi-criteria analysis (MCDA) with the Group Fuzzy Analytic Hierarchy Process (GFAHP) and fuzzy overlay techniques. Nine flood-influencing factors were considered, namely Digital Elevation Model (DEM), Slope, Normalized Difference Vegetation Index (NDVI), Horizontal Overland Flow Distance (HOFD), Vertical Overland Flow Distance (VOFD), Topographic Position Index (TPI), Topographic Wetness Index (TWI), Curve Number (CN), and Modified Fournier Index (MFI). Each factor was classified into five categories and weighted based on expert judgment through GFAHP, which effectively addresses uncertainty and variability in expert evaluations. The weighting values demonstrated that the DEM (0.248) and slope (0.188) exert the greatest influence on flood hazard. Results showed that 27% of the area belongs to the high and very high-risk zones, primarily concentrated along the Hinh and Ba rivers and around hydropower reservoirs. The derived weights were integrated in the GIS environment using fuzzy overlay to produce a flood risk map with five susceptibility levels, ranging from very low to very high. The findings highlight the effectiveness of the proposed approach as a decision-support tool for spatial planning, resource management and disaster risk reduction and demonstrate its potential applicability to other regions with comparable data conditions.
Co-Authors Hoang, Thi Thu Trang Nguyen, Nga T.T. Nguyen, Quoc Khanh Nguyen, Xuan Dao Tong, Hanh T. Vu, Dinh Duy