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2020 Vol.53, Issue 10 Preview Page

Research Article

Statistical investigation on size distribution of suspended cohesive sediment

점착성 부유사의 입도분포형 검증

Byeoungeun Parka
,
Jisun Byunb*
,
Minwoo Sonc
박 병은a
,
변 지선b*
,
손 민우c
aPh.D. Candidate, Department of Civil Engineering, Chungnam National University
bPost-Doctoral Fellow, Research Institute for Smart Infrastructure and Construction, Chungnam National University
cAssociate Professor, Department of Civil Engineering, Chungnam National University
a충남대학교 공과대학 토목공학과 박사과정
b충남대학교 스마트인프라건설연구소 박사후연구원
c충남대학교 공과대학 토목공학과 부교수
* Corresponding Author
31 October 2020. pp. 917-928
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Abstract

The purpose of this study is to find the appropriate probability distribution representing the size distribution of suspended cohesive sediment. Based on goodness-of-fit test for a significance level of 5% using the Kolmogorov-Smirnov test, it is found that the floc size distributions measured in laboratory experiment and field study show different results. In the case of sample data collected from field experiments, the Gamma distribution is the best fitting form. In the case of laboratory experiment results, the sample data shows the positively-skewed distribution and the GEV distribution is the best fitted. The lognormal distribution, which is generally assumed to be a floc size distribution, is not suitable for both field and laboratory results. By using 3-parameter lognormal distribution, it is shown that similar size distribution with floc size distribution can be simulated.

Keywords
Cohesive sediment
Floc
Size distribution
Goodness-of-fit test

본 연구는 점착성 부유사의 입도분포에 적합한 이론적 확률분포형을 찾는 것을 목적으로 수행되었다. 유의수준 5%에 대해 적합도 검정을 수행한 결과, 실험실 실험자료와 현장실험 자료에서 측정된 플럭입도분포는 다른 결과를 나타냈다. 현장실험으로부터 얻어진 표본자료의 경우 왼쪽으로 치우친 지수분포의 형태를 나타내며, Gamma 분포가 가장 우수하였다. 실험실실험 자료의 경우 표본자료가 양의 왜도를 가지며 GEV 분포가 가장 적합하였다. 많은 연구에서 점착성 유사의 입도분포로 가정되는 2매개변수 Lognormal 분포의 경우 현장실험 자료와 실험실실험 자료 모두 적합하지 않았으며, 위치매개변수를 추가하여 3매개변수 Lognormal 분포 적용 시 점착성 유사의 입도분포를 모사할 수 있는 것으로 나타났다.

키워드
점착성 유사
플럭
입도분포
적합도 검정
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Information
  • Publisher :KOREA WATER RESOURECES ASSOCIATION
  • Publisher(Ko) :한국수자원학회
  • Journal Title :Journal of Korea Water Resources Association
  • Journal Title(Ko) :한국수자원학회 논문집
  • Volume : 53
  • No :10
  • Pages :917-928
  • Received Date : 2020-07-14
  • Revised Date : 2020-08-25
  • Accepted Date : 2020-08-25
  • DOI :https://doi.org/10.3741/JKWRA.2020.53.10.917
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