scholarly journals Vulnerability Assessment of Dam Water Supply Capacity Based on Bivariate Frequency Analysis Using Copula

Water ◽  
2018 ◽  
Vol 10 (9) ◽  
pp. 1113
Author(s):  
Chulsang Yoo ◽  
Eunsaem Cho
Keyword(s):  
Water Supply ◽  
Water Deficit ◽  
Conventional Method ◽  
Frequency Analysis ◽  
Storage Capacity ◽  
Occurrence Probability ◽  
Copula Method ◽  
Supply Capacity ◽  
Bivariate Frequency Analysis ◽  
Better Than

The vulnerability of the water supply capacity of a dam is defined as the expected deficit volume from a typical water deficit event. In this study, a water deficit event was assumed to be a rectangle composed of the deficit duration and deficit intensity whose occurrence probability was then estimated by the bivariate frequency analysis based on the copula method. This approach is different from the conventional one based on the assumption of the same occurrence probability for all events. This proposed method was applied to the Namgang dam in Korea as an example and the resulting estimate of the vulnerability was compared with the conventional method. First, the ‘OR’ concept was found to be better than the ‘AND’ concept in the calculation of the occurrence probability. Additionally, based on the consideration of multicollinearity, it could be concluded that the occurrence probability should be estimated by considering the water deficit intensity and duration. For the Namgang dam, the vulnerability was determined to be 9.11 × 106 m3, which is about 3% of the total storage capacity. This estimated vulnerability is also about 70% of the amount estimated by applying the conventional method with the same occurrence probability for all water deficit events.

scholarly journals Evaluation of Dam Water-Supply Capacity in Korea Using the Water-Shortage Index

Water ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 956
Author(s):  
Chulsang Yoo ◽  
Changhyun Jun ◽  
Ju Hua Zhu ◽  
Wooyoung Na
Keyword(s):  
Water Supply ◽  
Storage Capacity ◽  
Water Shortage ◽  
Construction Cost ◽  
Water Supply Systems ◽  
Damage Cost ◽  
Water Storage Capacity ◽  
Spatially Distributed ◽  
Supply Capacity ◽  
Supply Systems

This study evaluates the dam water-supply capacity in Korea using the water shortage index. The water-shortage index (SI) and generalized water-shortage index (GSI) used in this study are evaluated and modified slightly by considering both the damage cost due to water-supply failure and the construction cost of water-supply systems in Korea. The modified indices are then applied for performance evaluation of 16 multipurpose dams in Korea, whose results are evaluated using different units: each dam, each river basin, and all dams. In the analysis of the dam level and basin level, water-supply problems are detected in several dams and in some river basins. However, the SI and GSI estimated for all dams are found to be lower than 1. This result indicates that, even though the total amount of storage capacity is enough to satisfy the design supply, water resources are not well spatially distributed in Korea. It is also found that the modified indices are valid to describe the performance of each dam in water deficient regions during occurrence years of major droughts. In conclusion, the SI and GSI can offer alternative ways of evaluating dam water supply under different environmental conditions and potentially help determine optimal water-storage capacity of dams.

Developing Habits and Knowing What Habits to Develop: A Look at the Role of Virtue in Ethics

1997 ◽  
Vol 6 (3) ◽  
pp. 347-355 ◽  
Author(s):  
Erich H. Loewy
Keyword(s):  
Medical Ethics ◽  
Virtue Ethics ◽  
Conventional Method ◽  
Greek Philosophy ◽  
Ethical Problems ◽  
Working Through ◽  
Traditional Approaches ◽  
Better Than

Virtue ethics attempts to identify certain commonly agreed-upon dispositions to act in certain ways, dispositions that would be accepted as ‘good’ by those affected, and to locate the goodness or badness of an act internal to the agent. Basically, virtue ethics is said to date back to Aristotle, but as Alisdair MacIntyre has pointed out, the whole idea of ‘virtue ethics’ would have been unintelligible in Greek philosophy for “a virtue (arete) was an excellence and ethics concerned excellence of character; all ethics was virtue ethics.” Virtue ethics as a method to approach problems in medical ethics is said by some to lend itself to working through cases at the bedside or, at least, is better than the conventional method of handling ethical problems. In this paper I want to explore some of the shortcomings of this approach, examine other traditional approaches, indicate some of their limitations, and suggest a different conceptualization of the approach.

scholarly journals Newly Developed System For The Analysis Of Micro Quantites Of Molybdenum (VI) Using Flow Injection Analysis

2007 ◽  
Vol 4 (2) ◽  
pp. 180-190
Author(s):  
Baghdad Science Journal
Keyword(s):  
Hydrogen Peroxide ◽  
Acid Medium ◽  
Conventional Method ◽  
Flow Injection ◽  
Flow Injection Analysis ◽  
Better Than

New microphotometer was constructed in our Laboratory Which deals with the determination of Molybdenum (VI) through its Catalysis effect on Hydrogen peroxide and potasum iodide Reaction in acid medium H2SO4 0.01 mM. Linearity of 97.3% for the range 5- 100 ppm. The repeatability of result was better than 0.8 % 0.5 ppm was obtanined as L.U. (The method applied for the determination of Molybdenum (VI) in medicinal Sample (centrum). The determination was compared well with the developed method the conventional method.

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