선박 거주구역에 화재발생 시 화재시뮬레이션 도구를 이용하여 화재확산형상을 실시간으로 예측하고 상황에 따른 적절한 대응방안을 제시할 수 있다면 화재사고로 인한 인명피해를 최소화시킬 수 있을 것으로 예상된다. 그러나 오늘날 화재시뮬레이션은 해 석대상공간의 크기와 그리드 개수에 따라 해석을 하는데 있어, 매우 장시간을 필요로 하는 현실적 한계가 있다. 이에 이 연구에서는 화재시뮬레이션 시간단축을 목적으로 선박 거주구역 화재시뮬레이션에 적용할 수 있는 격자크기와 생성방법에 대한 연구를 수행하였 다. 연구결과 선박 거주구역에 적용되는 격자크기는 0.25[m] 이내의 값을 사용하는 것이 가장 효율적인 것으로 판단되었다. 또한 single mesh 격자생성방법으로 수행했을 경우와 비교하여, multi mesh 격자생성방법으로 시뮬레이션을 수행하였을 때 가시거리 값은 4.3 %, 온 도 값은 8.3% 이내에서 유사하고 해석시간은 약 80% 감소하였기 때문에, multi mesh 방법으로 격자를 생성하는 것이 해석시간을 단축 하는데 있어 매우 효과적임을 확인하였다.

This thesis is the fundamental study on the adaptation of escape device for reducing small size of fish in set-net. The escape devices for experiments were made the grid-type devices with three different slit sizes (15, 20 and 25mm). The experiments of size selectivity on escape devices were conducted by using two kinds of species as black rockfish (Sebastes schlegeli) and sea perch (Lateolabrax maculatusi) in the experimental tank. The size selectivity curve was fitted by using a logistic function and the parameters of selectivity curve were estimated by a maximum likelihood method. In the results; 50% selection ranges for the grid-type escape devices with three different slit sizes were; a black rockfish was 13.30, 19.22 and 22.06cm and a sea perch was 17.64, 20.91 and 22.78cm, respectively. The 50% selection range of a black rockfish was wilder than a sea perch about 1.1~1.3 time. Therefore, the small size of fish are able to reduce by using the grid type escape device. However, the optimum slit size of grid should be decided to consider the size of target species and economics of catches.

This study utilized the 1/25,000 topographic map of the upper area from the Geum-ho watermark located at the middle of Geum-ho river from the National Geographic Information Institute. For the analysis, first, the influence of the size of critical area to the hydro topographic factors was examined changing grid size to 10m×10m, 30m×30m and 50m×50m, and the critical area for the formation of a river to 0.01㎢∼0.50㎢. It is known from the examination result of watershed morphology according to the grid size that the smaller grid size, the better resolution and accuracy. And it is found, from the analysis result of the degree of the river according to the minimum critical area for each grid size, that the grid size does not affect on the degree of the river, and the number of rivers with 2nd and higher degree does not show remarkable difference while there is big difference in the number of 1st degree rivers. From the results above, it is thought that the critical area of 0.15㎢∼0.20㎢ is appropriate for formation of a river being irrelevant to the grid size in extraction of hydro topographic parameters that are used in the runoff analysis model using topographic maps. Therefore, the GIUH model applied analysis results by use of the river level difference law proposed in this study for the explanation on the outflow response-changing characters according to the decision of a critical value of a minimum level difference river, showed that, since an ogival occurrence time and an ogival flow volume are very significant in a flood occurrence in case of not undertow facilities, the researcher could obtain a good result for the forecast of river outflow when considering a convenient application of the model and an easy acquisition of data, so it's judged that this model is proper as an algorism for the decision of a critical value of a river basin.