DSpace Collection:http://tainguyenso.vnu.edu.vn/jspui/handle/123456789/592026-05-23T10:38:46Z2026-05-23T10:38:46ZStability of spatial interpolation functions in finite element one‐dimensional kinematic wave rainfall‐runoff modelsLuong, Tuan AnhLarsson, Rolfhttp://tainguyenso.vnu.edu.vn/jspui/handle/123456789/2672011-04-17T03:09:08Z2008-01-01T00:00:00ZTitle: Stability of spatial interpolation functions in finite element one‐dimensional kinematic wave rainfall‐runoff models
Authors: Luong, Tuan Anh; Larsson, Rolf
Abstract: This paper analyzes the stability of linear, lumped, quadratic, and cubic spatial
interpolation functions in finite element one‐dimensional kinematic wave schemes for simulation of
rainfall‐runoff processes. Galerkin’s residual method transforms the kinematic wave partial
differential equations into a system of ordinary differential equations. The stability of this system is
analyzed using the definition of the norm of vectors and matrices. The stability index, or singularity
of the system, is computed by the Singular Value Decomposition algorithm. The oscillation of the
solution of the finite element one‐dimensional kinematic wave schemes results both from the
sources, and from the multiplication operator of oscillation. The results of computation experiment
and analysis show the advantage and disadvantage of different types of spatial interpolation
functions when FEM is applied for rainfall‐ runoff modeling by kinematic wave equations.
Description: VNU Journal of Science, Earth Sciences. Vol. 24 (2008), No. 2, P. 57‐652008-01-01T00:00:00ZUsing multi‐criteria analysis as a tool to select the feasible measures for sustainable development of brackish water shrimp culture in Quang Tri ProvinceNguyen, Tien GiangTran, Anh PhuongTran, Ngoc AnhNguyen, Thanh SonNguyen, Truong Khoahttp://tainguyenso.vnu.edu.vn/jspui/handle/123456789/2662011-04-17T03:05:22Z2008-01-01T00:00:00ZTitle: Using multi‐criteria analysis as a tool to select the feasible measures for sustainable development of brackish water shrimp culture in Quang Tri Province
Authors: Nguyen, Tien Giang; Tran, Anh Phuong; Tran, Ngoc Anh; Nguyen, Thanh Son; Nguyen, Truong Khoa
Abstract: In recent years, brackish water shrimp culture in Quang Tri Province has developed
rapidly. Thanks to this development, lives of many local farmers have been improved, contributing
considerably to the poverty alleviation goal. However, together with this positive impact, policymakers
and shrimp farmers are facing several issues such as spread of shrimp’s diseases, water
pollution and salinity intrusion. For the purpose of sustainable development, it is necessary to
search for and implement those measures which can solve effectively these emerging problems.
This paper presents the results on the application of a multi‐criteria analysis method to selecting
the most feasible measures to these problems. The MCA results suggest the four most feasible
measures and pinpoint that the combined option: sedimentation reservoir & reservoir with culture
plus improved feeding and water management as the ʺbestʺ option.
Description: VNU Journal of Science, Earth Sciences. Vol. 24 (2008), No. 2, P. 66‐782008-01-01T00:00:00ZNumerical study of long wave runup on a conical islandPhung, Dang Hieuhttp://tainguyenso.vnu.edu.vn/jspui/handle/123456789/2652011-04-17T03:01:10Z2008-01-01T00:00:00ZTitle: Numerical study of long wave runup on a conical island
Authors: Phung, Dang Hieu
Abstract: A numerical model based on the 2D shallow water equations was developed using the
Finite Volume Method. The model was applied to the study of long wave propagation and runup
on a conical island. The simulated results by the model were compared with published
experimental data and analyzed to understand more about the interaction processes between the
long waves and conical island in terms of water profile and wave runup height. The results of the
study confirmed the effects of edge waves on the runup height at the lee side of the island.
Description: VNU Journal of Science, Earth Sciences. Vol. 24 (2008), No. 2, P. 79‐862008-01-01T00:00:00ZEffects of using wastewater as nutrient sources on soil chemical properties in peri‐urban agricultural systemsNguyen, Manh KhaiPham, Thanh TuanNguyen, Cong VinhOborn, Ingridhttp://tainguyenso.vnu.edu.vn/jspui/handle/123456789/2642011-04-17T02:58:25Z2008-01-01T00:00:00ZTitle: Effects of using wastewater as nutrient sources on soil chemical properties in peri‐urban agricultural systems
Authors: Nguyen, Manh Khai; Pham, Thanh Tuan; Nguyen, Cong Vinh; Oborn, Ingrid
Abstract: Reusing domestic wastewater for irrigation and applying biosolids as a fertiliser in crop
production are common practices in peri‐urban areas of Vietnam. This study investigates the effects
of using domestic wastewater in field experiments on Fluvisols soils in peri‐urban areas of Hanoi
and Nam Dinh cities. We compared long‐term (30‐50 years) wastewater‐irrigated rice‐dominated
farming systems. Using wastewater for irrigation significantly affected pH, electrical conductivity
(EC), exchangeable K and Na and reverse aqua regia‐digestible (Rev Aq Reg) copper (Cu), lead (Pb)
and zinc (Zn) in the investigated areas compared with control plots irrigated using river water.
There were no significant effects of wastewater irrigation on the NH4NO3‐extractable fraction of
cadmium (Cd) and other trace metals, but the EDTA‐extractable fraction of Cu, Pb and Zn was
significantly increased.
Description: VNU Journal of Science, Earth Sciences. Vol 24 (2008), No. 2, P. 87‐952008-01-01T00:00:00Z