• Title/Summary/Keyword: storm characteristics

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A Study on the Preparation of Contents for Promoting the Establishment of a Disaster Safety Village in Rural Areas (농촌지역 재난안전마을 만들기 활성화를 위한 컨텐츠 마련에 관한 연구)

  • Koo, Wonhoi;Bae, Minho
    • Journal of the Society of Disaster Information
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    • v.14 no.4
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    • pp.387-398
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    • 2018
  • Purpose: The purpose of this study is to promote the disaster safety village establishment project that fits the characteristics of rural areas by investigating and analyzing the operation cases of contents with regard to disaster safety villages in Korea and Japan. Method: The contents of project related to disaster safety villages in Korea and Japan were classified into resident participation contents, structured contents and unstructured contents, for examining the characteristics of such contents through investigation and analysis, and the contents (draft) of disaster safety village that fitted the characteristics of rural areas were presented. Result: The contents of resident participation include basic safety education, CPR education, life experience training of evacuation shelter, evacuation training, concurrent training of farming activity and disaster activity and creating a village safety map in connection with competent authorities. The enactment of an act and an ordinance for the establishment of disaster safety village, expert dispatch system, storm and flood insurance system and funding system to raise the fund for establishing a village were presented as unstructured contents. In addition, the production of self supporting evacuation shelter, wireless evacuation announcement system, disaster prevention system for a river, emergency evacuation sign, village safety map sign and the establishment of disaster prevention park were presented as structured contents. Conclusion: The unstructured contents are the establishment of foundation for preparing laws and institutions and the structured contents should be installed by utilizing eco-friendly methods in consideration of the environments of rural areas along with securing the safety. Moreover, resident participation should utilize the contents by considering various items such as age, characteristics and environments of residents in rural villages.

Characterization of Wintertime Atmospheric Aerosols in Seoul Using PIXE and Supplementary Analyzers

  • Ma, Chang-Jin;Mikio Kasahara;Hwang, Kyung-Chul;Yeo, Hyun-Gu;Park, Kum-Chan
    • Journal of Korean Society for Atmospheric Environment
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    • v.16 no.E
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    • pp.19-27
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    • 2000
  • Particle Induced X-ray Emission (PIXE) and Elemental Analysis Syztem (EAS) were applied to the investiga-tion of the Characteristics and sources of wintertime atmospheric aerosols in Seoul. Atmospheric aerosols were collected by both fine and coarse fractions using a two-stage filter pack sampler from Kon-Kuk university during the winter season of 1999. PIXE was applied to the analysis of the middle and heavy elements with atomic numbers greater than 14(Si) and EAS was applied to the measurement of the light elements such as H, C and N. The fact that 64.2% of mass of fine particles in Seoul consists of the light elements (N, C , and H) suggests that the measurement of light elements is extremely important. The average mass concentration is Seoul was 38.6$\mu\textrm{g}$m(sup)-3. Elements such as Ca, Fe, Mg, and Ti appeared to have very low Fine/Coarse ratios(0.1∼0.4), whereas che-mical components related to anthropogenic sources such as Br, V, Pb, and Zn were observed to accumulate in the fine fraction. In the Asian Dust Storm(ADS) event, the concentation of soil components increased dramatically. Reconstruction of the fine mass concentrations estimated by a newly revised simple model was fairly in good agreement with the measured ones. Source identification was attempted using the enrichment factor and Pearsons coefficient of correlation. The typical elements derived from each source could be classified by this method.

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A Study on the Ripple Effect Economy of Busan Ubiquitous-Safety Realization on Using an Input-Output Model (I-O모형을 이용한 부산 U-방재 실현의 경제적 파급 효과 분석에 관한 연구)

  • Ryu, Tae-Chang;Kim, Tae-Min;Kim, Gyeong-Su
    • Journal of the Korean Society of Hazard Mitigation
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    • v.8 no.6
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    • pp.93-100
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    • 2008
  • Dense of population construction and high density of skyscraper, and geological characteristics caused natural disasters(e.g. typhoon, tsunami, flood, storm, earthquake, etc.) and manmade disasters(e.g. fire, collapse, explosion, traffic accident, etc.). the extent and scale of the disaster are getting larger. To cope with such problems, Busan City has established the basic plan to secure the life and property of the citizens through model strategy and design of Ubiquitous-Safety Busan. This study quantitatively analyzed the ripple effect on local economy through the fulfillment of Ubiquitous-Safety. The production inducing effect of 250 billion won directly and indirectly can be estimated due to the realization of Ubiquitous-Safety. The value added effect of 115 billion won can be estimated. the employment effect of 5,580 persons can be generated with income effect of 51 billion won.

Determining the Flash Flood Warning Trigger Rainfall using GIS (GIS를 활용한 돌발홍수 기준우량 결정)

  • Hwang, Chang-Sup;Jun, Kye-Won;Yeon, In-Sung
    • Journal of the Korean Association of Geographic Information Studies
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    • v.9 no.1
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    • pp.78-88
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    • 2006
  • This paper is to apply Geographical Information System (GIS) supported Geomorphoclimatic Instantaneous Unit Hydrograph (GCIUH) approach for the calculated flash flood trigger rainfall of the mountainous area. GIS techniques was applied in geography data construction such as average slope, drainage area, channel characteristics. Especially, decided stream order using GIS at stream order decision that is important for input variable of GCIUH. We compared the GCIUH peak discharge with the existing report using the design storm at Chundong basin($14.58km^2$). The results showed that derived the GCIUH was a very proper method in the calculation of mountaunous discharge. At the Chundong basin, flash flood trigger rainfall was 12.57mm in the first 20 minutes when the threshold discharge was $11.42m^3/sec$.

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Hydraulic Performance Analysis of Tangential Vortex Intakes with Compound Section by Three-Dimensional Numerical Simulation (3차원 수치모의에 의한 복단면 형상의 접선식 와류 유입구 수리 특성 분석)

  • Lee, Du Han;Rhee, Dong Sop;Kim, Myounghwan
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.15 no.1
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    • pp.506-514
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    • 2014
  • Recently the interest about the vortex intakes are rapidly increased because of its performance to drain a plenty of collected storm water at a time. The tangential intake a kind of vortex intakes is very applicable because this type is very simple and little against other types, but it has a big weakness that the vortex flow is not been rarely created below the design discharge. In this study, the characteristics of a tangential intake and two kinds of a newly suggested compound section type intake are analyzed by the 3D numerical modeling based on theories about the control shift and free drainage condition. The analysis focused on the flow condition, flow surface formation, depth-discharge relation, area ratio of air core. Based on this study, the mild-sloped compound section type intake is the optimal, but steep-sloped compound section type is also the optional for the small design discharge.

Facies and sequence analysis on the Lower Ordovician Mungok Formation (전기 오오도비스기 문곡층의 시퀀스 및 상 분석)

  • Choi Yong Seok;Lee Yong Il
    • The Korean Journal of Petroleum Geology
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    • v.9 no.1_2 s.10
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    • pp.1-15
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    • 2001
  • Hierarchically controlled sequence stratigraphic analysis shows that the Lower Ordovician mixed carbonatesiliciclastic Mungok Formation, Korea consists of three depositional sequences: T1, T2, and T3 in ascending order. Sequence boundaries are generally marked by abrupt transition from coarse-grained shallow-water carbonates to finegrained deeper-water carbonates mixed with fine-grained siliciclastics, and show indication of subaerial exposure such as karstification. Within this sequence stratigraphic framework, facies characteristics indicate that the Mungok sequences were mostly deposited on a subtidal ramp without slope break. The Mungok ramp had been under the influence of frequent tropical storm activity during deposition. The difference in lithology of tempestites seems to have been controlled by the nature of substrates and by proximality. High-frequency cycles consist of upward-shallowing facies successions. Cycles of shallow-water and basinal deposits are not well represented, probably due to cycle amalgamation. Cycle stacking patterns do not show a consistent thickness change that is usually associated with a large-scale sea-level change probably because of unfilled accommodation space.

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Characteristics of Coagulants Distribution by the Pumping Rate in Pump Diffusion Mixer (Pump Diffusion Mixer에서 압력수량에 따른 응집제 확산분포 특성)

  • Park, Youngoh;Kim, Ki-Don;Park, No-Suk;Lim, Jae-Lim;Lim, Kyung-Ho
    • Journal of Korean Society of Water and Wastewater
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    • v.22 no.1
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    • pp.65-71
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    • 2008
  • This study collected the latest 30-year (1976~2005) continuous rainfall data hourly recorded at 61 meterological observatories in Korea, and the continuous rainfall data was divided into individual rainfall events. In addition, distribution charts of average rainfall event-depth were created to facilitate the application to the overflow risk-based design of detention storage basin. This study shows that 4 hour is appropriate for SST (storm separation time) to separate individual rainfall events from the continuous rainfall data, and the one-parameter exponential distribution is suitable for the frequency distribution of rainfall event depths for the domestic rainfall data. The analysis of the domestic rainfall data using SST of 4 hour showed that the individual rainfall event was 1380 to 2031 times, the average rainfall event-depth was 19.1 to 32.4mm, and ranged between 0.877 and 0.926. Distribution charts of average rainfall event-depth were created for 4hour and 6 hour of SST, respectively. The inland Gyeongsangbuk-do, Western coastal area and inland of Jeollabuk-do had relatively lower average rainfall event-depth, whereas Southern coastal area, such as Namhae, Yeosu, and Jeju-do had relatively higher average rainfall event-depth.

Identifying dominant parameters of storm-sewer-overflows in seperate sewer system (강우시 도시배수구역의 유출특성 지배인자 분석)

  • Jung, Si Mon;Park, In Hyeok;Ha, Sung Ryong
    • Journal of Wetlands Research
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    • v.10 no.2
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    • pp.105-114
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    • 2008
  • Growth in population and urbanization has progressively increased the loadings of pollutants from non-point sources as well as point sources. Separated sewer overflows(SSO) have been considered as a major cause of water-quality deterioration of natural water-courses in the vicinity of the heavily urbanized areas. The factors defining the magnitude and occurrence of SSO are site-specific. It is important to know exact properties of pollutants contained in SSO to address water quality impacts that are caused by SSO inputs to the receiving waters. Site and event parameters found to have significant influences on urban runoff pollutant EMCs include total event rainfall, antecedent dry period, rainfall intensity. In this study, a field survey was carried out in some selected areas of Cheongju city. Literature from previous similar studies was consulted and some important factors affecting the runoff characteristics of urban drainage areas were analyzed for some selected survey points. It was found that the factors most affecting BOD are the number of dry days prior to rainfall and the intensity of the rainfall. The factor most affecting CODcr is the number of dry days prior to rainfall. The factors most affecting SS are the amount of rainfall and the number of dry days prior to rainfall. The factor most affecting TN is the amount of rainfall. The factor most affecting TP is the amount of rainfall and the number of dry days prior to rainfall.

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Spatial prioritization of permeable pavement considering multiple general circulation models: Mokgamcheon watershed (다수의 전지구모형을 고려한 투수성 포장시설의 우선지역 선정: 목감천 유역)

  • Song, Younghoon;Chung, Eun-Sung
    • Journal of Korea Water Resources Association
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    • v.52 no.12
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    • pp.1011-1023
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    • 2019
  • Rapid urbanization increases the risk of hydrologic disasters due to the increase of impervious areas in urban areas. Precipitation characteristics can be transformed due to the rise of global temperatures. Thus urban areas with the increased impervious areas are more exposed to hydrological disasters than ever before. Therefore, low impact development practices have been widely installed to rehabilitate the distorted hydrologic cycle in the urban area. This study used the Stormwater Management Model to analyze the water quantity and quality of the Mokgamcheon which had been severely urbanized, considering future climate scenarios presented by various general circulation models (GCMs). In addition the effectiveness of permeable pavement by 27 sub-watersheds was simulated in terms of water quantity and quality considering various GCMs and then the priorities of sub-watersheds were derived using an alternative valuation index which uses the pressure-state-response framework.

Evaluation of Applicability of the ESTIMATOR Model for the Analysis of Nutrient Load Characteristics

  • Shin, Yong-Chul;Heo, Sung-Gu;Lim, Kyoung-Jae;Choi, Joong-Dae
    • Journal of The Korean Society of Agricultural Engineers
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    • v.47 no.7
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    • pp.67-75
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    • 2005
  • It has been well-known that the Nonpoint Source (NPS) pollutions are the primary contributors to water quality degradation in the receiving water bodies as well as the Point Source (PS) pollutions. To develop an effective management practice for water quality improvement, pollutant loads must be first estimated. In many studies, the Numeric Integration (NI) method has been used because of its ease of application, irrespective of the total number of samples collected for each storm event. Thus, there have been needs for more accurate pollutant load estimation with a limited number of water quality samples. In this study, NI method and regression method using the USGS ESTIMATOR model were comparatively used to calculate the pollutant loads for the Wolgokri watershed, Gangwon Province. The $NO_{3}$-N, T-N, and T-P loads using NI method and ESTIMATOR model were 13.85 kg/ha, 45.92 kg/ha, and 1.887 kg/ha, and 11.93 kg/ha,43.20 kg/ha, and 1.650 kg/ha, respectively. The estimated loads using ESTIMATOR model were lower than those using NI method by $86\%$, $94\%$, and $87\%$. These discrepancies in the estimated loads using a different load estimation method could be explained in that the total number of samples were not sufficient enough for NI method. Thus, ESTIMATOR model is recommended for the frequently stream discharge and less frequently measured water quality data.