Lake Orta, in northern Italy, has been acid since the 1960's. Lake Orta is a deep and large lake. The average pH in 1988 was 4.5 units. As a remedial action, about 15,000 t of calcium carbonate were added between May 1989 and June 1990. The average pH of the lake increased to 5.52 units in 1991. Given the volume of the lake, this is a large increase. A computer generated animation visualizes the change in lake water pH during, and after the treatment. A colour scale quantifies observed pH values. Data were collected monthly at eight stations, from the water surface to the bottom. Each animation frame is updated daily. The visualization of over 30,000 data shows that some lime left the lake through the Nigoglia River during the summer months and that liming operations in a large and deep lake have a larger effect in periods of full circulation rather than during periods of thermal stratification. Animations were created using custom programs written in C. The animation is available on floppy disks from the authors..

Visualization of pH changes due to liming treatments in Lake Orta, Italy, using computer generated animations. / E. Halfon, G. Tartari, M. Howell, A. Binelli. - 16:B-16(1994), pp. 37-48.

Visualization of pH changes due to liming treatments in Lake Orta, Italy, using computer generated animations.

A. Binelli
Ultimo
1994

Abstract

Lake Orta, in northern Italy, has been acid since the 1960's. Lake Orta is a deep and large lake. The average pH in 1988 was 4.5 units. As a remedial action, about 15,000 t of calcium carbonate were added between May 1989 and June 1990. The average pH of the lake increased to 5.52 units in 1991. Given the volume of the lake, this is a large increase. A computer generated animation visualizes the change in lake water pH during, and after the treatment. A colour scale quantifies observed pH values. Data were collected monthly at eight stations, from the water surface to the bottom. Each animation frame is updated daily. The visualization of over 30,000 data shows that some lime left the lake through the Nigoglia River during the summer months and that liming operations in a large and deep lake have a larger effect in periods of full circulation rather than during periods of thermal stratification. Animations were created using custom programs written in C. The animation is available on floppy disks from the authors..
multimedia information systems ; image generation ; methodology and techniques
Settore INF/01 - Informatica
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/147531
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