• Proceedings of the Korea Water Resources Association Conference
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• 2009.05a
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• pp.2078-2082
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• 2009

Riparian vegetation distribution patterns and diversity relative to various fluvial geomorphic channel patterns, stream bank stabilization methods, and stream flow processes are described and interpreted for selected stream of Goesan, Central Korea. Idong Stream Pilot Project, which began in May 2003 and finished in December 2003, was selected to develop effective methods. The project aim to maintain or increase stream bank stabilization ecosystem goods and services while protecting downstream and stream bank ecosystem. A number of protecting methods which are a Flight of fieldstone, Vegetation block, Green river block, Stone net, Green environment block, Eco friendly cobble, Vegetation mat and Geo green cell and Firefly block were applied on the bank of Idong stream. The stream sites have been monitored about flora conditions each method in 2007. We selected 12 points for summer seasons to separately investigate in left bank, right bank and river bed. The main purpose of this study was to find out suitable methods and to improve stream restoration techniques for ecosystem. On the stream bank, Eco friendly cobble method(9.57) was the highest average of vegetation cover and Firefly block method(3.87) was the lowest average in applied methods.

• KCID journal
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• v.17 no.2
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• pp.71-81
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• 2010

Stream Pilot Project, which began in May 2003 and finished in December 2003, was selected to develop effective methods applicable to nature-like streams. Stream restoration projects aim to maintain or increase ecosystem goods and services while protecting downstream and coastal ecosystems. Fields environmental monitoring such as flow discharge and precipitation were conducted along the Idong stream for amount of channel zone change in 2007. This study selected three monitoring positions to measure the water level and discharge of flowing water. A stage-discharge relation is obtained from direct discharge measurements for three stations by fitting an empirical relationship to the data set. Since discharge measures are made only for low flow conditions, a curve of discharge against stage can then be built by fitting these data with a power curve. And this study used data obtained from floodmark checkup as well as HEC-RAS model to analyze the hydrodynamic characteristics of monitoring sites. Reach-averaged hydraulic parameters for the supply reach were calculated from the small area's HEC-RAS model for Idong stream, and a HEC-RAS model used to analyze hydraulics for a period in 2007, after the stream was considered bank stabilization.

• Journal of Korea Water Resources Association
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• v.41 no.10
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• pp.983-993
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• 2008

In recent times, sea level increasing caused by abnormal weather and global warming, sea-sand dredging and complex development causes various kind of erosion damages onto the coastal area in the world. The various types of erosion control and protection methods are applied but there are no signs of fruitful effectiveness. The PC concrete protection block for shore protection structure is practically installed in globally but most of structures in the present day became villainous because of bad accessability. In this study, hydrophilic revetments for control and protection of coastline erosion will be developed in order to make up for a faculty of the shore erosion protection block with better accessibility and excellent protection ability. Experimental measurements were researched to insure for the capacity and facility on reflection coefficient, overtopping volume, and overtopping height characteristics of newly developed shore erosion protection block in model tests. As the result, hydraulic model tests show much excellent than the general step block. Field tests were carried out also to verify through vegetative test on an affinity and construction work test of control-protection on coastline erosion with actual utilization. In the latter case, deposition of sand accumulation occurred in fairly short time at the established reaches and then we can be confirmed to utilize for newly developed block as the revetments for control and protection of coastline erosion.

• Korean Journal of Environment and Ecology
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• v.24 no.3
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• pp.302-317
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• 2010

In this study, not only to present the management plan but also to verify the effectiveness for a area of improving the landscape and the area of creating the base of bio-inhabitation in Tancheon stream concrete embankment where were practised the vegetation-mat measures for greening via monitoring i.e. restoration progress. The results of monitoring, there were a total of 41 taxa, 18 families, 38 species, 3 varieties in 2006, moreover in the 2007, there were a total of 59 taxa, 19 families, 56 species, 3 varieties and in the period 2008, 64 taxa, 29 families, 59 species, 8 varieties. Therefore, these site has increased the plant spaces year by year. The distribution of vegetation characteristics shows that Miscanthus sacchariflorus and Pennisetum alopecuroides expands their influence in the area of applying the construction method. Those area appears a diversity of native species by the stream deposition at the flood. Thus, its condition is very soundly ecological health and eco-friend. At present, native species have been dominant, however, disturbed species and invasive species can be expected to increase dramatically in the future. Therefore, it is necessary to a long-range monitoring and management for maintaining an environmentally sound aquatic ecosystem. On this area refer to mix the river vegetation of primary succession and disturbed vegetation. For that reason, the method of constructing the vegetation-mat measures for greening in embankment does not need to remove the concrete and can install a coir-mat on the top. It leads to improve the landscape, moreover, it was analysed the such dramatic changes in the vegetation species richness by providing continuous the plant growth basis have a impact on in bio-diversity.

• Journal of Navigation and Port Research
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• v.44 no.4
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• pp.305-311
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• 2020

Rising sea levels along the coast from global warming causes the increase of wave energy along the coast. This rise in sea levels results in relatively deep water levels, which would incur the loss of sand that had not occurred in the past from erosion in coastal areas. Generally, it has been challenging to protect against coastal erosion, and the slope, cross-sectional shape, and materials are selected for the site conditions depending on the change in external forces. However, the application of counter measures based on insufficient understanding of the phenomenon is causing various damage, indicating the need for technological development and converging technologies to improve credibility. In this study, we developed eco-friendly permeable biopolymer concrete blocks to control the coastal erosion by using the Bio-Coast, an effective porous structure that mitigates the destructive erosion caused by the rising sea levels. The hexagonal design of Bio-Coast was derived from the honeycomb, columnar joints, and clover, which are durable and stable structures in nature, and the design was changed to apply bumps on the Bio-Coast filling in the form of a clover to reduce wave overtopping and run-up. Applying the field condition of beaches on the east coast of Korea, the block weight and size were decided and the prototype blocks were manufactured and are ready for field placement. In particular, it is intended to protect coastal areas from destructive erosion by natural and artificial external forces, and to extend the design to river,s lakes, and natural walking trails, to improve the efficiency of quality control and process control through the use of blocks.

• Proceedings of the Korea Water Resources Association Conference
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• 2009.05a
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• pp.2093-2097
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• 2009

수제는 본래 제방의 보호나 주운의 수심확보 등을 주목적으로 주로 호안 또는 하안 전면부에 설치되어지는 구조물이다. 과거에 하천이 주운으로 이용되었던 시기와는 달리, 제방축조기술 등의 발달에 따라 그 역할이 점차 줄어들면서 주역할 기능이 사라지게 되었다. 하지만 최근에 수제의 설치로 인한 수제역 내의 역흐름과 재순환영역이 하천환경을 개선시킨다는 기능이 주목받으면서 국부적인 침식과 퇴적을 유도하여 다양한 생태환경을 제공하는 수제의 효용이 재인식되고 있다. 하천의 주운용 수심을 확보함과 동시에 생태서식환경을 개선시키기 위한 수제 설치가 주요한 공법으로 재인식되어, 일정 수위확보로 수생태계의 교란을 억제하고 하천의 황단적 단류를 막아 건습교체를 억제하는 등의 하천생태계의 유도가 필요하다. 따라서 본 연구에서는 하도에 수제를 설치함으로서 생태하천을 창출하기 위한 수제기법을 제시토록 하였다.

• Proceedings of the Korea Water Resources Association Conference
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• 2008.05a
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• pp.515-518
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• 2008

본 연구는 충적하천에 주운용 운하수로를 유도하기 위한 공법으로 충적하천의 사행수로에서 수충부에 수제를 설치하여 하안의 침식을 막고 대안측에 사주발생역의 발달을 억제할 수 있는 수로안정화 기법을 제시하였다. 낙동강은 대표적인 충적하천으로 발달하고 있어 최근 국내에서 논의 되고 있는 운하수로는 사행이 심한 하도구간에서 하도중심부로의 유심 유도가 필수적이다. 수제는 하천의 흐름을 하도 중앙으로 집중시켜 주운을 위한 일정수심을 확보하는 역할을 하며, 흐름방향과 유속을 제어함으로써 흐름에 의한 하안의 침식작용을 억제하는 호안 역할을 병행한다. 따라서 수제 설치에 따른 가상만곡도와 낙동강의 회천합류부$\sim$황강합류부 하도구간(L=10km)을 2차원 수리모델인 RMA-2로 수리학적 해석을 실시하여 하도중심부로의 유심 유도와 수심 확보를 위한 유속을 비교분석함으로써 수제에 의한 하도의 안정화를 유도할 수 있었다.

• Korean Journal of Environment and Ecology
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• v.15 no.2
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• pp.193-200
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• 2001

본 연구는 하반식생이 일정 지역에 정착할 때 밀접하게 관여하는 토양환경에 주목하였으며, 특히 하반 미지형 이라는 특수 지역에서 생각할수 있는 미지형 형성의 토양구조와 하반미지형이 식물에 미치는 토양수분, 그리고 식생과의 관계에 대하여 검토하였다. 그결과 각 미지형마다 그 퇴적상태가 다르며 이에따라 하반식생도 달리 나타났다. 또한 모두 조사구에 서 모래층 밑에는 반드시 자갈층의 단계를 반복하고 있는데 이는 반복된 과거의 홍수에 의한 것으로 판단된다. 따라서 미지형을 고려한 식생을 도입하여야 하며, 토양수분과 지라수위와 식생과의 관계는 하천마다 다르므로 현지 지형에 맞는 식생 도입이 요구된다. 앞으로 보다 지속적, 장기적 현장조사와 하천 수문, 수리학적 data의 축정에 따른 하반식생과 입지환경요인과의 관련성에 관한 연구의 축적이 필요하며, 이에 기초한 식생호안공법의 개발이 향후과제라 할 수 있다.

• Proceedings of the Korea Water Resources Association Conference
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• 2010.05a
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• pp.1049-1052
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• 2010

수제는 본래 제방의 보호나 주운의 수심확보 등을 주목적으로 주로 호안 또는 하안 전면부에 설치되어지는 구조물이다. 과거에 하천이 주운으로 이용되었던 시기와는 달리, 제방축조기술 등의 발달에 따라 그 역할이 점차 줄어들면서 주역할 기능이 사라지게 되었다. 하지만 최근에 수제의 설치로 인한 수제역 내의 역흐름과 재순환영역이 하천환경을 개선시킨다는 기능이 주목받으면서 국부적인 침식과 퇴적을 유도하여 다양한 생태환경을 제공하는 수제의 효용이 재인식되고 있다. 하천의 주운용 수심을 확보함과 동시에 생태서식환경을 개선시키기 위한 수제 설치가 주요한 공법으로 재인식되어, 일정 수위확보로 수생태계의 교란을 억제하고 하천의 황단적 단류를 막아 건습교체를 억제하는 등의 하천생태계의 유도가 필요하다. 따라서 본 연구에서는 하도에 수제를 설치함으로서 생태하천을 창출하기 위한 수제기법을 제시토록 하였다.

• Journal of the Korean Geosynthetics Society
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• v.17 no.3
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• pp.1-8
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• 2018

Sand compaction pile (SCP) is a ground improvement method which is used to secure the stability of the soft ground by using a type of replacement pile filled with coarse grained material. The behavior characteristics of the SCP, which is frequently used for improving both the onshore and offshore ground, is governed by the ground condition, the installation method, and replacement ratio. Therefore, the stability of the SCP in terms of the bearing capacity and displacement needs to be evaluated considering both the design values and in-situ conditions of construction site. In this study, numerical analysis is carried out based on the conditions of 00 revetment construction site in South Korea where unexpected displacement occurred during construction of SCP. Based on the analysis results, the displacement of the revetment structure according to the replacement ratio of the SCP was compared to the result calculated from design formulas. The results showed that the lateral displacement can be exceeded the reference value from proposed criteria regardless of increased replacement ratio of SPC. It is also confirmed that the behavior of the structure according to the replacement ratio of SPC in not reflected in the existing calculation methods. Therefore, the stability of the SCP composite ground should be examined through the site inspection after the SCP construction.