| Title |
Characteristics of Biochemical Oxygen Demand Export from Paddy Fields during Storm and Non-storm Period and Evaluation of Unit Load |
| Authors |
최동호 ( Dongho Choi ) ; 조소현 ( Sohyun Cho ) ; 황태희 ( Taehee Hwang ) ; 김영석 ( Youngsuk Kim ) ; 정재운 ( Jaewoon Jung ) ; 최우정 ( Woojung Choi ) ; 박현규 ( Hyunkyu Park ) ; 윤광식 ( Kwangsik Yoon ) |
| DOI |
https://doi.org/10.15681/KSWE.2017.33.5.531 |
| Keywords |
BOD; TMDL; Unit load; Water management |
| Abstract |
The biologic Oxygen Demand (BOD) is a reliable and generally accepted indicator of water pollution by organic pollutants. Accordingly, estimation of BOD export from paddies carries important implications fwith regard to water management in rural areas. In this study, hydrology and BOD concentration were monitored during the period 2008 through 2012, in an effort to understand the characteristics of BOD export from paddy fields. The findings demonstrated that BOD load by rainfall above 50 mm. occupied about 50 % of total load, whereas the load by less than ten mm. rainfall occupied about 29 % of the total load during periods of stormy activity. It therefore seems that it could be possible to reduce the BOD load up to 29 % during storm periods, when drainage control conducted for rainfall less than ten mm.(an amount which is relatively easy to manage). The documented mean loads of storm and non-storm were 17.1 kg ha-1 yr-1 and 11.2 kg ha-1 yr-1, respectively. The BOD load during the significant rainfall period was similar to the renewed unit load by NIER (2014). However, there were substantial differences between unit load and actual load when the non-storm load was incorporated into the BOD load estimation from paddy fields. In view of the foregoing, it is felt that, the non-storm load needs to be further considered and managed for the successful implementation of Total Maximum Daily Load (TMDL) program. |