Vu Thanh Tam
Ministry of Natural Resources and Environment
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Publication
Featured researches published by Vu Thanh Tam.
Hydrological Sciences Journal-journal Des Sciences Hydrologiques | 2004
Vu Thanh Tam; Florimond De Smedt; Okke Batelaan; Alain Dassargues
Abstract Abstract Time series analyses are applied to characterize the transient flow regimes of the Nam La cavern conduit, northwest Vietnam. The conduit transforms the input signal to an output signal, and the degree of transformation provides information on the nature of the flow system. The input for the analysis is net precipitation and the flow hydrograph at the cave entrance, while the output series is the flow hydrograph at the resurgence. Cross-correlation and cross-spectrum analysis are used to investigate the stationarity and linearity of the input–output transformation of the system, resulting in hydrodynamic properties such as system memory, response time, and mean delay between input and output. It is shown that during high flow periods, the flow in the conduit is pressurized. Consequently, the linear input–output assumption holds only for low flows. To highlight the hydrodynamics of the cavern conduit for the high flow periods, wavelet spectrum and wavelet cross-spectrum analyses are applied.
Environmental Earth Sciences | 2016
Vu Thanh Tam; Okke Batelaan; Ine Beyen
Coastal plains in Central Vietnam are characterized by strong seasonal precipitation. As predicted by the A1B gas emission scenario, higher precipitation with more extremes is expected by 2050 for Central Vietnam. To assess impact of these changes on the groundwater resources of the coastal aquifers, a statistical downscaling method with the weather generator LARS-WG coupled with the physically distributed rainfall–runoff model WetSpa and the variable-density groundwater flow model SEAWAT is employed. Results show that contrary to expectation the increase in precipitation by 2050 for the wet months of October and December leads to a sharp decrease in groundwater recharge and groundwater head and consequently a decrease in groundwater resources for the study area. It is concluded that in the assessment of impact of climate change on groundwater resources of coastal sloping plains controlling factors like precipitation intensity in combination with terrain characteristics of the recharge area of aquifers play a major role.
Journal of Cave and Karst Studies | 2002
L.Q. Hung; N.Q. Dinh; Okke Batelaan; Vu Thanh Tam; David Lagrou
Hydrogeology Journal | 2004
Vu Thanh Tam; F. De Smedt; Okke Batelaan; Alain Dassargues
Hydrogeology Journal | 2009
Simon Jusseret; Vu Thanh Tam; Alain Dassargues
Environmental Earth Sciences | 2005
Y. B. Liu; Okke Batelaan; F. De Smedt; Nt Huong; Vu Thanh Tam
Hydrogeology Journal | 2014
Vu Thanh Tam; Okke Batelaan; Tran Thanh Le; Pham Quy Nhan
Hydrogeology Journal | 2005
Vu Thanh Tam; F. De Smedt; Okke Batelaan; L. Q. Hung; Alain Dassargues
Hydrogeology Journal | 2010
Vu Thanh Tam; Okke Batelaan
Trans-Karst 2004, International Transdiciplinary Conference on Development and Conservation of Karst Regions | 2004
Vu Thanh Tam; Nguyen Dai Trung; Duy Thai Ke; Okke Batelaan