Emergy evaluation perspectives of a multipurpose dam proposal in Korea
✍ Scribed by Daeseok Kang; Seok Soon Park
- Publisher
- Elsevier Science
- Year
- 2002
- Tongue
- English
- Weight
- 197 KB
- Volume
- 66
- Category
- Article
- ISSN
- 0301-4797
No coin nor oath required. For personal study only.
✦ Synopsis
The `emergy' concept was used to evaluate the economy of Korea and the contributions of a multipurpose dam proposal to the real wealth of the Korean economy. Emergy is de®ned as the available energy of one kind previously used up directly and indirectly to make a product or service. The indices for Korea calculated from the emergy evaluation were close to those of developed countries. Even though its monetary balance of payments was negative in 1997, the economy of Korea showed positive balance in trade when exports and imports were expressed in emergy. The emergy evaluation showed that the Korean economy places a large stress on its environment. Water supply and generation of electricity were the most important contributions of the proposed dam in terms of emergy; 46Á5 and 45Á1% of the total bene®t, respectively. Flood control contributed 8Á4% of the total bene®t. Major costs associated with the proposed dam were from sediments (33Á2% of the total cost), construction services (22Á8%), and social disruption of the region (21Á6%). In terms of emergy, the ratio of bene®ts to costs of the proposed dam was 2Á78 if sediments are not included, and 1Á86 if sediments are included, which result in more bene®ts than costs in both cases. The bene®t to cost ratio of the dam was larger than that of the current system (1Á42) without the dam whether sediments are included in the total cost or not. The environmental stress of the proposed dam was considerably lower than that of the Korean economy, but the dam might increase stress on local environment.