Search

Your search keyword '"Yudianto, Doddi"' showing total 37 results
Start Over Author "Yudianto, Doddi"
37 results on '"Yudianto, Doddi"'

3. Tapping the Potential of Shallow Water Model for Wave Simulations

Author

Ginting, Bobby Minola, Yudianto, Doddi, Wicaksono, Albert, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, Mohammed, Bashar S., editor, Shafiq, Nasir, editor, Rahman M. Kutty, Shamsul, editor, Mohamad, Hisham, editor, and Balogun, Abdul-Lateef, editor

Published
2021
Full Text
View/download PDF

7. Investigation of Deoxygenation Rate Determination in Cikakembang River, West Java, Indonesia.

Author

Fitriana, Finna, Yudianto, Doddi, Polisar, Andrea, and Sanjaya, S.

Subjects
BIOCHEMICAL oxygen demand, DEOXYGENATION, WATER quality, STANDARD deviations
Abstract

Cikakembang River, a tributary of Citarum River, is situated in the densely populated Majalaya District, renowned for textile production. Direct discharges of domestic and industrial pollutants into the river contribute to substantial pollution, making it crucial to manage pollution levels. This implies that controlling pollution is crucial, as it significantly impacts the condition of Citarum River, already infamous as one of the world most polluted rivers. A key indicator for assessing river water quality is Biological Oxygen Demand (BOD), representing the oxygen required for microorganism-mediated decomposition. This parameter is influenced by deoxygenation rate, denoted as kd. Therefore, this study aimed to analyze the most suitable kd value for Cikakembang River using various empirical methods, including Simple, Fujimoto, Sawyer, Thomas, Fair, and Hydroscience. The result showed that Thomas method provided the most accurate prediction for BOD concentration of the river. In rainy season, Root mean square error (RMSE), mean absolute percentage error (MAPE), and coefficient of determination (R²) values were 0.542, 0.035, and 0.981, respectively, and in dry season, the values were 0.117, 0.009, and 0.999. Additionally, kd value effectively simulated the river water quality using HEC-RAS, yielding satisfactory results. RMSE, MAPE, and R² values for BOD concentration were 3.551, 0.162, and 0.331 in rainy season and 1.071, 0.100, and 0.812 in dry season. Finally, the modeling result showed that Cikakembang River did not meet the Class 2 Water Quality Standard during both rainy and dry seasons. This finding is critical, as it underscores the severity of the pollution problem in the river and the urgent need for comprehensive and effective management strategies to improve its water quality. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

37. Feasibility of Bacterial Technology for Treating a Polluted Urban Streams from the Perspective of Numerical Modelling.

Author

Yudianto, Doddi and Yue-Bo Xie

Subjects
*OXYGEN, *WATER pollution, *RIVERS, *BACTERIA, *BIOCHEMICAL oxygen demand
Abstract

With the recent use of bacterial technology for the restoration of a polluted urban stream in China, this paper will show the general feasibility of such biological treatment from the perspective of numerical modelling. Based on the results, a low concentration of BOD5 can be achieved in shorter distance for higher bacterial concentration applied. Generally greater flow of domestic wastewater will be proportionally balanced by higher bacterial growth. Under limited DO concentration, higher bacterial concentration would also create a breaking point on the declining distribution of BOD5. The combination of oxygenation and artificial mixing of bacteria would result in lower concentrations of BOD5 at the downstream. [ABSTRACT FROM AUTHOR]

Published
2010

Catalog

Books, media, physical & digital resources
See catalog results