Phong V.V. Le

Phong V.V. Le
Vietnam National University, Hanoi | VNU · Faculty of Hydro-Meteorology and Oceanography

PhD

About

27
Publications
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Introduction
Skills and Expertise

Publications

Publications (27)
Preprint
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Several metrics are investigated as objective functions for machine-learning algorithms for the remote sensing of precipitation. Besides the mean squared error, mean absolute error and linear correlation coefficient, metrics derived from the Kullback-Liebler divergence and the earth mover distance are examined to compare the prediction to the targe...
Article
In this study, the spatio-temporal variability of drought over entire Southeast Asia (SEA) region and its associations with the large-scale climate drivers during the period 1960–2019 are investigated for the first time. The 12-month Standardized Precipitation Evapotranspiration Index (SPEI) was computed based on the monthly Global Precipitation Cl...
Article
Full-text available
Groundwater is a critical component of water resources and has become the primary water supply for agricultural and domestic uses in the Vietnamese Mekong Delta (VMD). Widespread groundwater level declines have occurred in the VMD over recent decades, reflecting that extraction rates exceed aquifer recharge in the region. However, the impacts of cl...
Article
Full-text available
Plain Language Summary Dominant modes (i.e., coherent spatio‐temporal patterns of variability) of the climate system, such as the Madden‐Julian Oscillation (MJO), influence a wide range of weather and climate phenomena worldwide. The ability of state‐of‐the‐art climate models to accurately simulate these modes is crucial for advancing our understan...
Preprint
Saltwater intrusion has become one of the most concerning issues in the Vietnamese Mekong Delta (VMD) due to its increasing impacts on agriculture and food security of Vietnam. Reliable estimation of salinity plays a crucial role to mitigate the impacts of saltwater intrusion. This study developed a hybrid technique that merges satellite imagery wi...
Article
Full-text available
Interferometric synthetic aperture radar (InSAR), one of the most commonly used remote sensing methods for observing and monitoring land subsidence, has been applied in Hanoi, Vietnam in several studies with results showing deformation up to 2014. However, freely accessible Sentinel-1 InSAR data have not been investigated thoroughly to date. Here,...
Article
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Spectral PCA (sPCA), in contrast to classical PCA, offers the advantage of identifying organized spatio-temporal patterns within specific frequency bands and extracting dynamical modes. However, the unavoidable tradeoff between frequency resolution and robustness of the PCs leads to high sensitivity to noise and overfitting, which limits the interp...
Preprint
InSARFlow is a highly scalable, parallel software tool for land deformation and subsidence modeling. The program integrates ISCE and GIAnT software on a high-performance parallel framework for processing large-scale networks of interferograms and time series InSAR analysis. Its parallel computing engine is based on the distributed memory architectu...
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Drought may have severe societal, economic, and environmental consequences. However, the space‐time characteristics of drought over Vietnam remain poorly understood. In this study, we investigate the spatio‐temporal variability of drought using the Palmer Drought Severity Index (PDSI) over mainland Vietnam for the 1980‐2014 period. Through data ana...
Article
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Background The transmission of malaria is highly variable and depends on a range of climatic and anthropogenic factors. This study investigates the combined, i.e. direct and indirect, impacts of climate change on the dynamics of malaria through modifications in: (i) the sporogonic cycle of Plasmodium induced by air temperature increase, and (ii) th...
Data
Anopheles larval samples collected at different habitat types in Kilifi district during the 2006-2012 period. A large fraction of the samples was found in open habitats (TIF). (EPS)
Article
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Soil organic carbon (SOC) is going through rapid reorganization due to anthropogenic influences. Understanding how biogeochemical transformation and erosion-induced SOC redistribution influence SOC profiles and stocks is critical to our food security and adaptation to climate change. The important roles of erosion and deposition on SOC dynamics hav...
Article
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Natural wetlands are ecological, biogeochemical and hydrological hotspots, yet continue to disappear under human pressure. Their shapes and sizes control their hydro‐ecological functions. We propose that elevation data can be used to delineate potential wetlands and that the (statistical) distributions of potential wetlands should be identical to t...
Article
Full-text available
Background: The transmission of malaria is highly variable and depends on a range of climatic and anthropogenic factors. In addition, the dispersal of Anopheles mosquitoes is a key determinant that affects the persistence and dynamics of malaria. Simple, lumped-population models of malaria prevalence have been insufficient for predicting the compl...
Article
Expansion and intensification of managed landscapes for agriculture have resulted in severe unintended global impacts, including degradation of arable land and eutrophication of receiving water bodies. Modern agricultural practices rely on significant direct and indirect human energy inputs through farm machinery and chemical use, respectively, whi...
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Full-text available
Vegetation acclimation resulting from elevated atmospheric CO2 concentration, along with response to increased temperature and altered rainfall pattern, is expected to result in emergent behavior in ecologic and hydrologic functions. We hypothesize that microtopographic variability, which are landscape features typically of the length scale of the...
Article
Green roofs and cool roofs are alternative roofing strategies that mitigate urban heat island effects and improve building energy performance. Green roofs consist of soil and vegetation layers that provide runoff reduction, thermal insulation, and potential natural habitat, but can require regular maintenance. Cool roofs involve a reflective layer...
Article
The widespread availability of high-resolution lidar data provides an opportunity to capture micro-topographic control on the partitioning and transport of water for incorporation in coupled surface – sub-surface flow modeling. However, large-scale simulations of integrated flow at the lidar data resolution are computationally expensive due to the...
Article
Topographic depressions, areas of no lateral surface flow, are ubiquitous characteristics of the land surface that control many ecosystem and biogeochemical processes. High density of depressions increases the surface storage capacity, whereas lower depression density increases runoff, thus influencing soil moisture states, hydrologic connectivity,...
Article
High resolution Lidar topography and Airborne Visible/Infrared Imaging Sprectrometer (AVIRIS) remote sensing data are becoming increasingly available over large regions of the Earth's surface. These data sets can be linked to reveal processes and landscape features that cannot be detected at lower resolutions. In May 2011, the Bird's Point New Madr...
Article
Ecophysiological models that vertically resolve vegetation canopy states are becoming a powerful tool for studying the exchange of mass, energy, and momentum between the land surface and the atmosphere. A mechanistic multilayer canopy–soil–root system model (MLCan) developed by Drewry et al. (2010a) has been used to capture the emergent vegetation...
Article
Elevated CO2 in the atmosphere leads to a number of acclimatory responses in different vegetation types. These may be characterized as structural such as vegetation height or foliage density, ecophysiological such as reduction in stomatal conductance, and biochemical such as photosynthetic down-regulation. Furthermore, the allocation of assimilated...
Article
Full-text available
To meet emerging bioenergy demands, significant areas of the large-scale agricultural landscape of the Midwestern United States could be converted to second generation bioenergy crops such as miscanthus and switchgrass. The high biomass productivity of bioenergy crops in a longer growing season linked tightly to water use highlight the potential fo...
Article
To meet the emerging bioenergy production demands, the agricultural Midwestern United States is likely to see large-scale land use conversions to accommodate expansion of perennial bioenergy crops such as Miscanthus (Miscanthus X giganteus) and Switchgrass (Panicum virgatum). This leads to open questions regarding the impact on the hydrologic cycle...

Projects

Projects (3)
Project
Asian Pacific FRIEND-WATER is one of the eight FRIEND (Flow Regimes from International Experimental and Network Data) programs of the UNESCO International Hydrological Program. The program aims to enhance research collaboration between the countries in Asian Pacific region (and with other regions) in the field of hydrology and related sciences, within several major research themes in the area. The research themes are: erosion and suspended solid transport; coastal ecohydrology; water quality under the impact by human activities and climate change; flow regimes and water resources... In the framework of the program, different activities could be coordinated by FRIEND are as follows: international scientific workshops/conferences, training courses, scientific exchange, database for sharing... We hope to give a better chance for enhancing the existing international scientific network in Asia-Pacific region.