광승리 구릉 정부의 풍성사구층에 대한 OSL 연대측정

신원정(Won-Jeong Shin),최정헌(Jeong-Heon Choi),김종연(Jong-Yeon Kim),김종욱(Jong-Wook Kim),허서영(Seoyoung Heo) 대한지질학회 2014 대한지질학회 학술대회 Vol.2014 No.10

광승리 연안의 연안범람기원퇴적층 형성과 변화 과정에 대한 연구 - 퇴적물의 매몰연대와 화학분석을 기반으로 -

신원정 ( Shin Won Jeong ),양동윤 ( Yang Dong Yoon ),김종연 ( Kim Jong Yeon ) 한국지형학회 2018 한국지형학회지 Vol.25 No.3

As part of further study on Gwangseungri coastal deposits which occurred at 10 ~ 15m above sea level and was analyzed as palaeo-coastal flood-type sediments, six burial ages of six additional samples from the two cross sections (KST1 and, KST2) near to the points of the past study were estimated and the geochemical analysis was performed. Further investigation on the cross section KST1 revealed a reversal of the burial age at the bottom of the section which was identified as palaeo-flooding sediments and supposed to have been buried about 350 years ago. At the lower part of the KST1, the burial age of the sediment layer was estimated to be 3,800 years. The lower part of KST2 sediments was identified as sediments that was formed about 6,600 years ago and about 20,000 years ago. Considering the inclination of the sediment layers, the coastal flooding sediments reported to have formed 700 years ago in the previous study are located at the top and the KST1 section analyzed in this study seemed to be connected to the lower part. The chemical analysis showed that the relationship between these layers was not continuous but had a discontinuous characteristic influenced by a specific event, and the chemical composition also showed a rapid change. If we judge these together, the lowest part of Gwangseungri sediment layer seemed to have formed during the last glacial period but it was hard to find its origins clearly. On top of this layer, a fine sediment layer containing gravels was also formed. It seemed that sedimentation did not occur continuously, but was affected by temporary events in such a way that after a sediment layer was formed, it stopped. Since then, a coastal flooding event occurred about 700 years ago, and part of flooded sediments accumulated in the rear slope. After that, when a flood layer including additional granular materials about 350 years ago was formed, sedimentation along the slope seemed to have occurred.

영덕군 병곡면의 단층 노두 특성에 대한 연구

신원정 ( Won Jeong Shin ),김종연 ( Jong Yeon Kim ) 한국지형학회 2021 한국지형학회지 Vol.28 No.3

In the southeastern part of the Korean Peninsula, the Yangsan Fault, an active fault zone, has developed. Many earthquakes occur around these faults, and the possibility of earthquakes occurring along the branch faults is being discussed. On the other hand, the Yeongdeok Fault is reported in Yeongdeok-gun, which is the northern part of the Yangsan fault. In this study, goemorphic characteristics of a set faults found on the outcrop of the gentle slope of the coast of Byeonggok-myeon were analyzed and granulometric and geochemical characteristics of sediments and other materials, including fault gouges were analyzed. The outcrop of Byeonggok-myeon is the part of the fault core and can be divided into two parts. Theses fault are formed on the upper part of the Mesozoic bedrock and the tertiary sedimentary layer of red sand-supported clasts are covered in several sedimentary units. The faults were normal fault sets, and a number of vertical cracks were developed, and glossy surfaces were observed in the fault area. It appears that these faults have occurred after alluvial deposition had been formed. In the case of samples from fault gouges, there were differences in particle size and geochemical characteristics from the surrounding area.

최후 빙기 이후 신생대 퇴적분지의 지형발달과정: 송천과 평해남대천 유역을 사례로

신원정 ( Shin Won-jeong ),김종연 ( Kim Jong-yeon ) 한국지형학회 2024 한국지형학회지 Vol.31 No.4

The estuary and surrounding area of the Pyeonghaenamdaechon and Songcheon Rivers on the east coast of Gyeongsangbuk-do are regions where a Paleogene-Neogene sedimentary basin was formed after tectonic movements during the Cenozoic era. Local subsidence and the formation of sedimentary basins during the Paleogene~Neogene period, as well as changes in sea level, have significantly influenced the landform of the coastal and nearby river. This study identifies the depth and extent of the incised valleys formed during the low sea level periods of the glacial period and the depth and characteristics of the sediment layers deposited during the post-glacial period. The Songchon River has incised valleys up to 55 m below the current sea level, with valley widths ranging from approximately 2 to 4 km. Additionally, the plain area north of the Songchon River contains valleys formed approximately 10m below the current sea level. Overall, the estuary area of the Songchon River exhibits a deep incised valley formed around an altitude of -40 m. In the Pyeonghae area, deep incised valleys at altitudes of -36 m and -34.7 m have been identified, with sediment layer depths in the upstream direction ranging from 15 to 20 m. Similarly, in the Pyeonghaenamdaechon River, the locations of deeply incised valleys align with the current river valleys. The estuaries and adjacent bays of these two rivers are relatively large compared to the scale of the rivers, likely influenced by underlying geological structures. These valleys were transformed into bays due to rising sea levels during the post-glacial period and were later filled with riverine sediments. During the early post-glacial period, a high sedimentation rate was observed, characterized primarily by coarse sediments. Over time, this was followed by a lower sedimentation rate dominated by fine sediments. In the Geumcheon River, a tributary of the Pyeonghaenamdaechon River, the presence of a convex longitudinal river profile in the downstream section may be attributed to differences in rock types; however, it is also plausible that changes in the erosional base level, such as the subsidence of the Pyeonghae Basin and sea level fluctuations in the East Sea.

기후 요소와 투표율 간의 관계에 대한 고찰

신원정 ( Won-jeong Shin ) 한국지리학회 2017 한국지리학회지 Vol.6 No.2

The relationship between climatic factors of election day and turnout rates based on the results of previous presidential elections, parliamentary elections, and local elections are examined in this study. It was found that temperature and cloudiness were not related to the turnout rate. In the case of precipitation, the turnout rate on a rainy (or snowy) day, but it was difficult to generalize the relationship between the two factors. In addition, there was no significant effect on the change of turnout by region or turnout by sex and age according to the presence of precipitation. It is difficult to see precipitation as beneficial for a specific political party. It can be concluded that the effect of weather on turnout in Korea is not so much, based on this study. However, since the amount of data is insufficient to examine the relationship between the two factors, it is necessary to deepen study in the future continuously.

철원군 이길리 습지의 지형 특성

신원정 ( Won Jeong Shin ),김종연 ( Jong Yeon Kim ) 한국지리학회 2021 한국지리학회지 Vol.10 No.3

Igil-ri Wetland, a riverine wetland, has been developed in Dongsong-eup, Cheorwon-gun, Gangwon-do, Korea. The wetland area is the upstream part of the Hantangang river, and is located within the Northern Area of the Civilian Control Line. Because of accessibility problems, geomorphological and geological investigations of the Igil-ri Wetland have been limitedly conducted. The purpose of this study is to understand the geomorphological and geological characteristics, focusing on the fluvial landforms in the Igil-ri Wetland area. In the Igil-ri wetland area, basalt and granite landforms are distributed, and around the Hantangang river, basalt-based river terraces, floodplains, and steptoe are developed. The Igil-ri area is generally based on basalt layers, above it, fluvial sediment layers appear. It is estimated that basalt lava has filled valleys from the downstream. In addition, sand bars and gravel bars are repeatedly distributed on river bed, and chute channel and braided channel are formed in the Hantangang river. A large amount of sediments were likely transported from various tributaries and upstream, centered on the Gimhwa Namdaecheon Stream. Currently, Igil-ri wetland area has little anthropogenic influence due to military factors, so it not only functions as a habitat for many animals and plants, but also has high value as a place for geomorphology learning. Therefore, it seems necessary to discuss the designation of ecological wetland protection area. This study will help as basic data for designating the Igil-ri wetland as an ecological wetland protected area.

충청북도 및 청주시 외국인 분포와 인구 특성 연구

신원정 ( Won Jeong Shin ),김종연 ( Jong Yeon Kim ) 한국지리학회 2021 한국지리학회지 Vol.10 No.2

With the number of foreigners residing in Korea exceeding 1 million, the need for policy responses that match the regional characteristics of foreigners living in the region is being emphasized. In this study, the distribution of foreigners by gender, nationality, and status of residence, and population characteristics by age in Chungcheongbuk-do and Cheongju-si were analyzed using official statistical data for June 2020 and June 2021. The proportion of foreigners in Chungcheongbuk-do is about 2.2%. Even within Chungcheongbuk-do, there is a big difference between cities and counties, and a significant number of foreigners live in Cheongju, Eumseong-gun, Jincheon-gun, and Chungju-si. In Eumseong-gun and Jincheon-gun, foreigners account for 8.93% and 6.38% of the total population. There are large regional differences in status of residence and structure by age, and the proportion of workers is high in industrial areas, forming a group residential area. In particular, in the Bongmyeong-dong area of Cheongju-si, foreigners from the former Soviet Union and neighboring countries reside intensively. It seems that various efforts at the local government level are needed for educational and cultural support and exchanges and cooperation with Koreans for these collective residential areas.

현대 지형학 연구의 패러다임 변화에 대한 고찰

신원정 ( Won-jeong Shin ) 서울대학교 지리교육과 2014 지리교육논집 Vol.58 No.-

This paper investigated how qualitative and descriptive approach has been changed to quantitative and dynamic approach in geomorphology study. The modern geomorphological researches that started with Powell and Gilbert were carried out using qualitative approach of W. M. Davis. At this time, history of landscape evolution was dealt with significantly, and descriptive analysis on landscape features was considered mainly. However, since many researchers pointed out the limitations of Davis’s cycle of erosion, it has been the subject of debate whether Davisian geomorphic interpretations have validity. Furthermore, after World War II, detailed and accurate information about earth surface landforms has been required, as practical application of geomorphological knowledge was discussed with advanced computer technology. In this atmosphere, the quantitative study of channel networks by Horton greatly influenced subsequent studies, and since then, Strahler led to the quantitative geomorphological analysis.

대청도 옥죽동·대진동 사구의 물리·화학적 특성 및 퇴적시기 고찰

신원정 ( Shin Won Jeong ),김종욱 ( Kim Jong Wook ),김종연 ( Kim Jong Yeon ) 한국지형학회 2018 한국지형학회지 Vol.25 No.2

The purpose of this study was to investigate the physicochemical characteristics and formation age of sand dunes in the Okjukdong and Dajindong, Daecheong Island. As a result, most of the sand deposited in Okjukdong were composed of medium sized sand with moderately well sorted. The SiO2 and Al2O3 accounted for a very high proportion of these deposits. There were some differences in characteristics between the sands in the dune and beach, whereas similar characteristics were observed among the materials (OJ-B, OJ-C and OJ-D) in the dune. In case of Dajindong, heterogeneous geochemical characteristics were found in the lower point. It was estimated that this was due to the influence of Daejin-dong black beach. Age dating results showed that uncovered dunes in Okjukdong were deposited 0.44±0.02 ~ 0.50±0.02 ka, and sand deposits in Dajindong were formed 0.16±0.01 ~ 0.18±0.01 ka. In both Okjukdong and Dajindong, sand deposits estimated to be formed 70 years ago, therefore it can be estimated that sand movement was active throughout the area from about hundred years ago. In this study area, the growth of sand dunes has been active in recent several decades or hundred years. It seems that there were different regions where deposits predominated over time. The source of dune sand was also different from time to time. Since the windbreak forest was established, the natural growth of sand dunes was limited, and sand nourishment was carried out by period. Therefore, in order to protect and continuously utilize coastal sand dunes in Daecheong Island, it is necessary to prepare conservation plan.

다중시기 원격탐사 자료를 이용한 영광군 백수읍ㆍ염산면 일대의 변화 분석

신원정 ( Won-jeong Shin ) 서울대학교 지리교육과 2016 지리교육논집 Vol.60 No.-

Coastal areas of Korea have undergone many changes over the years with economic development. The areas were affected by human activities and were changed in a short period of time. Along with this, the geomorphological features have changed giving rise to a variety of problems. In this study, the process of change was figured out using multi-temporal remote sensed data. Baeksu-eup and Yeomsan-myeon correspond to this study area, where these were faced with the Yellow Sea on the west. The remote sensed data on 1967, 1989, 2000, 2009 and topographical map on 1918 were used to study. As a result, these areas were expanded for 1918-2009. The areas in farmland, fish farm and salt pan particularly increase. Many topographies such as coastal sand dunes and streams have changed too. These changes were performed by economic development plan of the government, and most of that occurred before the 2000s. This study can contribute to understanding changing and development process of coastal areas in Younggwang-gun.