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2 2013

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Flow Adaptive Simulation of Dynamic Water Body Based on River Velocity Field

Rui X., Song X., Ju Y., Ding Z., Lu J.

Przegląd Elektrotechniczny

2013

R. 89, nr 3b

221--227

Simulation of natural water in river flow is a key issue in implementation of Digital Basin. This paper presents a method of water flow visualization which can adapt for the channel of the river based on the velocity field. Aiming at simulating large area river flow, first, Level of details(Lods) are constructed for river velocity fields according to the spatial relationship between view point and the targets. Second, it calculates the velocity fields of steady water flow in real-time using a novel quick Poisson-disk boundary sampling method, and then, Simplified velocity fields are adopted for driving and restrict the sprite textures so as to make them meet Poisson-disk distribution along the river channel. Finally, it blends and render sprite textures and gets real water flow effects. This method uses GLSL（OpenGL Shading Language）shaders to render the dynamic water flow, the shaders use GPU programmable rendering pipeline for graphics calculations, it reduces the real-time computation time of CPU and improves the overall efficiency of the algorithm. An experiment is carried out over Three Gorges Reservoir basin, it suggests that the method achieved a promising results, and the proposed method can be effectively used in simulation of large scale dynamic flowing water.

W artykule przedstawiono metodę wizualizacji przepływu wody w korycie rzecznym, biorący pod uwagę rozkład prędkości wody na dużym obszarze. W pierwszym kroku określony został stopień ilości detali w badanym obszarze, następnie szczegółowo obliczono pola określonych prędkości w oparciu o rozkład Poisson’a, po czym zaadaptowano uproszczone pola prędkości do opisu tzw. sprite’ów. Finalnie, na podstawie wspomnianych analiz otrzymano rzeczywisty obraz przepływu cieczy. Przeprowadzono badania weryfikacyjne proponowanej metody symulacji przepływu.

Responses of soil ß-glucosidase activities to simulated increased precipitation in a semi-arid temperate grasslands

Rui X., Liang D.

Polish Journal of Ecology

2013

Vol. 61, nr 2

401--404

In concurrent with global warming, precipitation regimes are predicted to change as well around the world. In this study, two experimental sites were selected with different nutrient availability along a slope to study the effects of simulated increased precipitation on soil β-glucosidase activities in an Inner Mongolian grassland. Soil samples were adjusted to 55% of water holding capacity and incubated at 22°C in the dark for 32 days. Soil β-glucosidase activities were measured prior to and after the incubation. Results showed that soil β-glucosidase activities had differential responses to increased precipitation with a significant increase in the downslope site, but not in the upslope site. Correlation analysis showed that the initial soil β-glucosidase activities exerted a significantly negative relationship with soluble organic nitrogen (N). Our results indicated that both water availability and soil soluble N availability played important roles in regulating β-glucosidase activities in this semiarid region.