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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Ecology and Resilient Infrastructure
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Journal DOI :
Korean Society of Ecology and Infrastructure Engineering
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Volume & Issues
Volume 3, Issue 2 - Jun 2016
Volume 3, Issue 1 - Mar 2016
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Development of a Hydraulic and Hydrologic Analysis Model for the Recovery of Ecological Connectivity at an Isolated Space of a Stream
Lee, Jin Woo ; Chegal, Sun dong ; Kim, Chang Wan ;
Ecology and Resilient Infrastructure, volume 3, issue 1, 2016, Pages 1~7
DOI : 10.17820/eri.2016.3.1.001
River restoration has recently progressed in consideration of ecological functions along with flood controls and conservation. For river restorations that consider ecological health and diversity, it is important to contemplate the recovery of hydraulic and hydrologic connectivity in isolated spaces by longitudinal structures. In this study, as a first step for the provision of hydraulic and hydrologic data, which is necessary for the ecological connection analysis in isolated spaces, we developed a one-dimensional numerical model for rainfall runoff and channel routing and applied it to the Cheongmi watershed. The developed numerical model can simulate hydraulic and hydrologic analysis at the same time using the rainfall data. Numerical results were compared with observed data and other numerical results. As a result, a very reasonable agreement is observed. The results of this study will be improved so that the long-term hydrologic and hydraulic analysis is possible to predict ecological change.
Experimental Analysis on the Behavior of Alternate Bars in a Channel with a Spur Dike
Jang, Chang-Lae ; Song, Youngjin ;
Ecology and Resilient Infrastructure, volume 3, issue 1, 2016, Pages 8~13
DOI : 10.17820/eri.2016.3.1.008
This study investigated the effects of a spur dike on the development processes, the migration, and the wave length of alternate bars with laboratory experiments. The bar wave length was shown to be shorter as the spur dikes got longer. The forcing effects of a long spur dike on the behavior of alternate bars were stronger than those of a shorter one. However, the bar height was not affected by the variation of the length of a spur dike. The bar migration speed was in inverse proportion to the bar wave length.
Numerical Analysis of the Behavior of Bars in a Compound Channel with a Drop Structure
Kim, Gi-Jung ; Jang, Chang-Lae ;
Ecology and Resilient Infrastructure, volume 3, issue 1, 2016, Pages 14~21
DOI : 10.17820/eri.2016.3.1.014
This study investigated the behavior of sediment bars in a compound channel with a drop structure. Flow was separated into side banks by alternate bars, and flow was concentrated into the downstream of bar fronts. The bed downstream of a drop structure degradated due to the concentrated flow from it. Bar shapes were kept by the influence of their shapes upstream. Alternate bars, central bars, and multiple bars were developed as the width to depth ratio increased, and the number of bars increased. The bar in the downstream of a drop structure decreased in length due to the concentration of flow and its disturbance.
Novel Algicidal Substance (Naphthoquinone Group) from Bio-derived Synthetic Materials against Harmful Cyanobacteria, Microcystis and Dolichospermum
Joo, Jae-Hyoung ; Cho, Hoon ; Han, Myung-Soo ;
Ecology and Resilient Infrastructure, volume 3, issue 1, 2016, Pages 22~34
DOI : 10.17820/eri.2016.3.1.022
We developed a biologically-derived substance naphthoquinone (NQ) derivate for the eco-safe mitigation of harmful cyanobacteria blooms such as Microcystis and Dolichospermum. NQ was reacted with various substituents (
) to produce different NQ derivatives. We tested a total of 92 algicidal compounds based on the algicidal activity of Microcystis and Dolichospermum. 22 compounds of NQ were selected as candidates (algicidal activity >80% at
). Among them, NQ 40 compound showed the highest algicidal activity of 99.6% and 100% at the optimal concentration of
on Microcystis and Dolichospermum, respectively. No algicidal effects of NQ 40 (
) were observed against non-target algae such as Stephanodiscus, Cyclotella and Peridinium. According to the results of acute eco-toxicity assessment, the
values of NQ 40 compound for Selenastrum capricornutum and Daphnia magna were 3.2 and
, respectively, and the
for Danio rerio was
. In addition, for D. magna chronic eco-toxicity assessment, no toxicity toward survival, growth and reproduction was observed. Therefore, we suggested the NQ 40 (
) compound as an alternative eco-safe algicidal substance to effectively mitigate harmful cyanobacteria blooms.
The Relationship between Parameters of the SWAT Model and the Geomorphological Characteristics of a Watershed
Lee, Woong Hee ; Lee, Ji Haeng ; Park, Ji Hun ; Choi, Heung Sik ;
Ecology and Resilient Infrastructure, volume 3, issue 1, 2016, Pages 35~45
DOI : 10.17820/eri.2016.3.1.035
The correlation relationships and their corresponding equations between the geomorphological parameters and the Soil Water Assessment Tool (SWAT) model parameters by Sequential Uncertainty Fitting - version 2 (SUFI-2) algorithm of SWAT Calibration and Uncertainty Programs (SWAT-CUP) were developed at the Seom-river experimental watershed. The parameters of the SWAT model at the Soksa-river experimental watershed were estimated by the developed equations. The SWAT model parameters were estimated by SUFI-2 algorithm of SWAT-CUP with rainfall-runoff data from the Soksa-river experimental watershed from 2000 to 2007. Rainfall-runoff simulation of the SWAT model was carried out at the Soksa-river experimental watershed from 2000 to 2007 for the applicability of the estimated parameters by the developed equations. The root mean square errors (RMSE) between the observed and the simulated rainfall-runoffs using the estimated parameters by developed equations of correlation analysis and the optimum parameters by SUFI-2 of SWAT-CUP were
respectively at the Soksa-river experimental watershed from 2000 to 2007. Therefore, it is considered that the parameter estimation of the SWAT model by the geomorphological characteristics parameters has applicability.
Characteristics of Thermal Variations with the Different Land Covers in an Urban Area
Park, Sung-Ae ; Kong, Hak-Yang ; Kim, Seung-Hyun ; Park, Sungmin ; Shin, Young-Kyu ;
Ecology and Resilient Infrastructure, volume 3, issue 1, 2016, Pages 46~53
DOI : 10.17820/eri.2016.3.1.046
This study was conducted to analyze the effect of the different land covers of an urban park (Hyowon park) in downtown Suwon on the urban thermal variations during a hot summer. The effect of the air temperature reduction in the urban park was 4.4%-4.5% for the downtown residence (Maetan-dong). This value was about 0.8% lower than that of the outskirts residence (Sanggwanggyo-dong). The daily mean temperature, daily maximum temperature, summer day and heat wave frequency were measured under the different land covers (cement-block, grass, pine-grass, shading area and mixed forest) showed these values generally decreased under natural land cover types. Daily minimum temperature and tropical night frequency didn't seem to correlate with the land cover types. Means of thermal comfort indices (wet bulb globe temperature, heat index and discomfort index) in the shading area, mixed forest and the pine-grass types were lower than those of cement block and grass types. However the levels of those indices were equal to 'very high' or 'caution' levels in the afternoon (13:00-15:00). In the morning (06:00-08:00), thermal comfort indices of the urban park didn't correlate with land cover types. Therefore, to reduce heat stress and to improve the thermal comfort in urban parks, an increase in the area of natural land cover such as grass, forest and open spaces is required.
Suggestion of a Decision Support System for Implementing the Water Quality Trading Policy to Developing Urban Areas
Shin, Yee-sook ;
Ecology and Resilient Infrastructure, volume 3, issue 1, 2016, Pages 54~61
DOI : 10.17820/eri.2016.3.1.054
There are many pilot programs and projects to implement the water quality trading (WQT) policy. But actual trading is relatively rare. The main reason of the scarce applications of WQT policy is the difficulty in determining the equalities between the trading sites. The uncertainty of the impacts of the nonpoint sources pollutant discharges between up and downstream urban development areas also makes the implementation of the policy harder. The simulated results from the watershed modeling program will be used to calculate the point and nonpoint sources pollutants of the future urban development scenarios. The amount of suspended sediments resulting from the urban developments and rainfall intensities will be used to indicate the environmental impacts of the water body between upstream and downstream. The water quality impacts after development scenarios to the outlet of the watershed were transferred to the trading units between two sites. The recommended trading units can be used as a decision support system for policy makers and stakeholders to carry out better WQT practices.
Planning of Narrow-mouth Frog (Kaloula borealis) Habitat Restoration Using Habitat Suitability Index (HSI)
Cho, Dong-Gil ; Shim, Yun-Jin ;
Ecology and Resilient Infrastructure, volume 3, issue 1, 2016, Pages 62~69
DOI : 10.17820/eri.2016.3.1.062
Narrow-mouth frog (Kaloula borealis) is the only amphibian species of genus Kaloula living in South Korea. They are designated and managed as endangered class II wildlife by the Ministry of Environment, Korea. Therefore, there is a desperate need of a habitat restoration study to prevent the extinction of narrow-mouth frog. This study is primarily for the purpose of presenting the direction and practical applications to restore damaged narrow-mouth frog habitats or to suggest alternative habitat options. The habitat suitability index (HSI) of narrow-mouth frog was applied to the research area in Mokpo City of Jeollanam-do Province, in order to present a new narrow-mouth frog habitat. We analyzed the research area based on historical contexts, ecological environment, ecology, and habitat requirements. The research area was divided into the core, buffer, and transition zones according to UNESCO MAB (Man and Biosphere) to establish local land-use plans. As for the foundation of the plan, we divided the habitat composition of the core, where narrow-mouth frog live in, into wetland (spawning area), grassland (shelter and feeding grounds), and forestland (feeding ground). We had a comparative analysis of habitat suitability in pre and post planning of narrow-mouth frog habitat restoration. For the validation study of habitat restoration plans, the future research should be on the composition of test-bed, continuous monitoring, and scientific habitat maintenance.
Assessment of Water Purification Capacity of Vegetation Mats for the Reduction of Nonpoint-Source Pollution Loads
Song, Kyu Sung ; Han, Sang Hun ;
Ecology and Resilient Infrastructure, volume 3, issue 1, 2016, Pages 70~75
DOI : 10.17820/eri.2016.3.1.070
The purpose of this study was to develop water-purification vegetation mats consisting of the eco-friendly materials and to validate their water purification capabilities with the objective of reducing nonpoint pollution into streams. The developed vegetation mats are made of coconut fiber shell and filling consisted of zeolite, diatomaceous earth or a mixture of calcinated foam media. The bench scale assessment of the water purification capability of the three filling materials showed that the removal efficiencies of suspended solid (SS), total nitrogen (T-N) and total phosphorus (T-P) were higher in the foam media than in zeolite or diatomaceous earth. From the results of the field experiment, the removal efficiencies of the vegetation mats filled with the foam media were 60.1% in SS, 32.2% in T-N and 20.2% in T-P. Therefore the vegetation mats filled with the foam media calcinated from zeolite and diatomaceous earth should have higher efficiencies in controlling the nonpoint source pollutions in streams.