• Title/Summary/Keyword: 기후지형학

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Formation and sedimentary environment of loess-paleosolsequence in the Jincheon Basin, Chungbuk Province, Korea (진천분지 뢰스-고토양 연속층의 형성과 퇴적 환경)

  • Yoon, Soon-Ock;Park, Chung-Sun;Hwang, Sangill
    • Journal of The Geomorphological Association of Korea
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    • v.20 no.3
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    • pp.1-14
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    • 2013
  • This study aims to investigate the formation and sedimentary environment including formative period, grain composition and climate change from loess-paleosol sequence deposited on a gravel bed of river terrace in the Jincheon Basin, Chungbuk Province. The Jincheon section consists downward of a surface layer, loess-paleosol sequence, transitional layer I, transitional layer II and gravel bed. It can be suggested from the OSL age dating that the sequence was deposited during MIS 6 to 4. The sequence can be divided into four horizons based on the variation in the magnetic susceptibility values. Grain size analysis reveals that the sequence indicates similar properties of grain size to loess deposits in Korea and especially, the Y values in the sequence are lower than those in the loess and paleosol horizons in the Chinese Loess Plateau and similar to those in the Red Clay in the Chinese Loess Plateau and Xiashu loess in the lower reaches of the Yangtze River. These Y values in the sequence can be attributed to the remote source and/or experience of intensive weathering process after deposition in the Korean Peninsula.

A Study of Contents Analysis on Questioning Daehan- Sin- Gygi - Focusing on the Contents of Physical Geography - (문답 대한 신지지 내용분석- 자연지리를 중심으로)

  • KANG, Chul-Sung
    • Journal of The Geomorphological Association of Korea
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    • v.17 no.4
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    • pp.17-27
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    • 2010
  • This article focuses on the period from the beginning of Twentieth, the period commonly regarded as the Enlightenment Period in Korea. Questioning Daehan-Sin-Gygi( 問答大韓新地誌) textbook consists of contents of physical geography aimed at rational and objective perception of the nature, within the frame of Sirak(實學) and Progressive Thoughts. In terms of contents organization, there are too wide range of facts and knowledge covered, with mechanical imitation of statement style of systematic and regional approach. Particularly, Geography textbook in this period attached greater importance to contents of physical geography than any other times. It is possible to conclude that real outcomes of geography education at the time contributed significantly to enlightenment of people and integration of the society. I consider that statement style of question-response used at the time is very worth-while.

Geomorphological significance and role of the sand bars of major river valleys in the South Korea - case study on the Nakdong river valleys - (한국 하천 모래톱의 지형학적 의미와 효능 - 낙동강 하곡을 사례로 -)

  • OH, Kyung-Seob;YANG, Jae-Hyuk;CHO, Heon
    • Journal of The Geomorphological Association of Korea
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    • v.18 no.2
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    • pp.1-14
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    • 2011
  • Remarkable development of sand bars is an important characteristic of fluviatile landform of Korea. Their development owes, in one part, to the supply of abundant sandy materials to river valley floor, originated from the weathering of essentially granitic rocks, distributed almost all over the country. It owes, in other part, to river valley disposition presenting many angular sinuosity guided by fracture grid, impeding regular migration of sandy materials along valley floor. Besides, high amplitude of river discharge fluctuation of the country plays is proved to be favorable hydrological factor for the development of the sand bars. The sand bars play important roles in favor of river hydro-ecological environment. They mitigate the amplitude of discharge fluctuation regime. In flood spell, sand grains in the main channel migrate so as to broden wet section. At the spell of low water level, they newly accumulate as to impede rapid stream discharge. Especially high quantity of reserved water in porous space of sand bar is preciously available both for human livelihood and for ecological environment.

Geomorphic Resources of Mt. Palgong, in Daegu (대구 팔공산의 지형자원)

  • JEON, Young-Gweon
    • Journal of The Geomorphological Association of Korea
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    • v.18 no.4
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    • pp.247-259
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    • 2011
  • This research aimed to analyse geomorphic resources of Mt. palgong(in Daegu city and Gyeongbuk province) through some field surveys, and then to clarify geomorphic features. The main results are as follows. 1) The geological boundary of the south slope(granite) is more clear than one of the north slope(granite bedrock and metamorphic sedimentary rock). Small basins are along with fault line between granite bedrock and metamorphic sedimentary rock. 2) It is estimated that relatively big valleys on the north slope are due to local climate, geomorphic and geological features. 3) Tor, sheeting joint, gutter are well developed both on the south slope and on the north slope, however the development of polygonal cracking and boulder stream are more dominant on the south slope; river cliff, pool, waterfall are more dominant on the north slope with valleys that well developed. 4) Scenic geomorphic landscapes are mainly developed in Dongsan valley and Chisan valley on the north slope. 5) There are many interesting geomorphic resources in the viewpoint of storytelling in Mt. Palgong. So the specific design to utilize such resources is required

The Quaternary Environmental Research Trend of the Korea and Future Issues -Focused on Last Interglacial~Holocene Environmental Study of Physical Geographers- (한국의 제4기 환경연구 - 최종간빙기~홀로세 환경연구를 중심으로 -)

  • PARK, Ji-Hoon
    • Journal of The Geomorphological Association of Korea
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    • v.18 no.4
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    • pp.97-126
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    • 2011
  • This paper has identified the Quaternary Environmental research trend of the Korea that has become the center of physical geographers and analyzed its performance by topic. As a result, we could see that most studies are accepted as research topics of restoring topography-climate-vegetation-sea level-soil environment during 'Last Interglacial ~Holocene' targeting the Korean Peninsula and the surrounded area. However, the situation is that it is difficult to restore the Quaternary Environment of the Korea in general only with their study performance. In the future, I hope the Quaternary Environmental research of the Korea would play more leading role than the researchers of other field by selecting more wide ranged and in-depth study topics in terms of the Quaternary Environmental research to furthermore introduce a new analytic technique.

Spatio-temporal Distribution of Surges and Tsunamis in the Korean Peninsula from 1392 to 1910 (조선시대(1392-1910) 해일 발생의 시공간적 분포 특성)

  • Kim, Da Hae;Hong, Seongchan;Choi, Kwang Hee
    • Journal of The Geomorphological Association of Korea
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    • v.28 no.3
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    • pp.37-49
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    • 2021
  • Analysis and prediction of storm surges are very important because the global warming has raised sea levels and increased the frequency of massive typhoons, accelerating damage of coastal flooding. However, the data for storm surge prediction is lacking due to the short history of observation in South Korea. The purpose of this study is to investigate the spatial and temporal characteristics of the previous surges and tsunamis based on the historical documents published during the Joseon Dynasty. In addition, we tried to evaluate the damage and spatial extent of such disasters, using the expressions about surge records including heights and number of administrative divisions. As a result, a total of 175 records of surges and tsunamis were compiled from 1392 to 1910: 145 events were extracted through the analysis of the ancient documents, and 30 events were from the previous research. Most of the strorm surges occurred along the west coast during summer season. More than half of the total surges were concentrated for 120 years from the mid 1600s to the mid 1700s, which was estimated to be highly relevant to the climate conditions in East Asia during the Little Ice Age. Hazardous areas by storm and tidal surges were also extracted, including Asan, Ganghwa, and Siheung during the Joseon Dyanisity period.

The physical geography in general:yesterday and tomorrow (자연지리학 일반: 회고와 전망)

  • Son, Ill
    • Journal of the Korean Geographical Society
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    • v.31 no.2
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    • pp.138-159
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    • 1996
  • There has been a tendency for Geomorphology and Climatology to be dominant in Physical Geography for 50 years in Korea. Physical Geography is concerned with the study of the totality of natural environment through the integrated approaches. But, an overall direction or a certain paradigm could not be found, because major sub-divisions of Physical Geography have been studied individually and the subjects and the approaches in studying Physical Geography are enormously diverse. A consensus of opinion could not also exist in deciding what kind of the sub-divisions should be included in the physical geography in general and how those should be summarized. Furthermore it would be considered imprudent to survey the studies of Physical Geography besides those of Geomorphology and Climatology due to the small number of researchers. Assuming that the rest of Physical Geographical studies with the exception of Geomorphological and Climatological studies are the Physical Geography in general, the studies of Physical Geogrpahy in general are summarized and several aspects are drown out as follows. First the descliption of all possible factors of natural environments was the pattern of early studies of Physical Geography and the tendency is maintained in the various kinds of research and project reports. Recently Physical Geographers have published several introductory textbooks or research monographs. In those books, however, the integrated approaches to Physical Geography were not suggested and the relationship between man and nature are dealt with in the elementary level. Second, the authentic soil studies of Physical Geographers are insignificant, because the studies of soil in Physical Geography have been mostly considered as the subsidiary means of Geomorphology Summarizing the studies of Soil Gegraphy by physical geographers and other Pedologists, the subjects are classified as soil-forming processes, soil erosions, soil in the tidal flat and reclaimed land, and soil pollution. Physical Geographers have focused upon the soil-forming processes in order to elucidate the geomorphic processes and the past climatic environment. The results of other subjects are trifling. Thirdy Byogeygrayhers and the results of studies are extremely of small number and the studies of Biogeography in Korea lines in the starting point. But, Biogeography could be a more unifying theme for the Physical-human Geography interface, and it would be expected to play an active part in the field of environmental conservation and resource management. Forth, the studies of Hydrogeography (Geographical Hydrology) in Korea have run through the studies of water balance and the morphometric studies such as the drainage network analysis and the relations of various kinds of morphometric elements in river. Recently, the hydrological model have introduced and developed to predict the flow of sediment, discharge, and ground water. The growth of groundwater studies is worthy of close attention. Finally, the studies on environmental problems was no mole than the general description about environmental destruction, resource development, environmental conservation, etc. until 1970s. The ecological perspectives on the relationship between man and nature were suggested in some studies of natural hazard. The new environmentalism having been introduced since 1980s. Human geographers have lead the studies of Environmental Perception. Environmental Ethics, Environmental Sociology, environmental policy. The Physical geographers have stay out of phase with the climate of the time and concentrate upon the publication of introductory textbooks. Recently, several studies on the human interference and modification of natural environments have been made an attempt in the fields of Geomorphology and climatology. Summarizing the studies of Physical Geography for 50 years in Korea, the integrated approaches inherent in Physical Geography disappeared little by little and the majol sub-divisions of Physical Ceography have develop in connection with the nearby earth sciences such as Geology, Meteorology, Pedology, Biology, Hydrology, etc been rediscovered by non-geographers under the guise of environmental science. It is expected that Physical Geography would revive as the dominant subject to cope with environmental problems, rearming with the innate integrated approaches.

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Restoration of the Stream Runoff by the Physical Deterministic Modeling and Formulation of Water Balance for the Catchment of Byungchun River in Chungcheong Province in Korea (물리 결정 모델링에 의한 충청도 병천천 유역의 하천 유출량 복원과 물 수지 수립)

  • KIM, Man-Kyu
    • Journal of The Geomorphological Association of Korea
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    • v.15 no.2
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    • pp.37-53
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    • 2008
  • This study has developed a water balance model for the catchment of Byungchun river using a BROOK90 4.4e physical deterministic water balance model with the long-term meterological data and stream run off data obtained from the basin of Byungchun river in Korea. It is intended that the validation model with calibrated model fitting parameter can build a long-term water balance plan for a period when meterological data are available but stream runoff data are not. Results of this study have satisfied the first expectation as an experiment for water balance modeling since measured stream runoff data have turned out to be very similar to simulated stream runoff data. Through the confirmation of model fitting parameters and validated simulation, water balance for the period of 1998 to 2006 has been restored. Unless the conditions of geomophology, vegetation, soil and land use change, meterological data alone can produce various hydrometeorological data related to stream runoff amount, soil water amount, and evapotranspiration. This study opens up a new horizon in restoring water balance in the past as well planning water balance in the present. The obtained results from this study are expected to be used in predicting future water balance in the wake of the changes in climate and vegetation in Korea.

Analysing of Forest Types in Chungnam Coastal area Using Multi-Temporal Satellite imagery and ASTER DEM Data (다중시기 위성영상과 ASTER DEM자료를 이용한 충남해안지역의 임상 변화 분석)

  • KIM, Jang-soo;JANG, Dong-Ho
    • Journal of The Geomorphological Association of Korea
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    • v.19 no.1
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    • pp.69-81
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    • 2012
  • This study analyzed the relationship between the geomorphic factor and changes in forest types of the Chungnam coastal area using ASTER DEM and multi-temporal satellite imagery. The results showed that in case coniferous forests vary by altitudinal segments, reduction rate continuously increased up to 500m, but dropped upon exceeding 550 meters. Next, the variation rate of mixed forests by altitudinal segments decreased from less than 50m. However, the variation rate of mixed forests increased from more than 50m to 700m, but dropped upon exceeding 700m. Lastly, the variation rate of deciduous forests according to altitudinal segments increased at all altitudes. A sharp increase was found in segments of more than 550 meters. With regard to the changes in the distribution area of forest types according to slope aspects, coniferous forests showed a reduction in all slope aspects. The reduction rate was especially higher in northern, northwestern, western and northeastern aspects. Mixed forests manifested a high growth rate in northwestern, northern and western aspects, but slightly decreased in eastern and southeastern aspects. In addition, deciduous forests increased in all slope aspects, but the growth rate was especially high in eastern, southeastern, northeastern and southern aspects.

Evaluation of Kinetic Energy of Raindrops at Daejeon city using Laser-optical Disdrometer (레이저-옵티컬 디스드로미터를 활용한 대전지역의 강우에너지 특성 평가)

  • LIM, Young Shin;KIM, Jong Wook;KIM, Jin Kwan;PARK, Byong Ik
    • Journal of The Geomorphological Association of Korea
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    • v.19 no.2
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    • pp.133-143
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    • 2012
  • To evaluate the kinetic energy of the raindrops, the drop size distribution and the terminal velocity of the raindrops had been measured from January to September 2010 using the laser-optical disdrometer in KIGAM, Daejeon, Korea. The relationship between kinetic energy (KE) and rainfall intensity (I) was computed as logarithmic and exponential model, respectively, under the rainfall intensity of about 142mm/h. The exponential model is more suitable for the relationship of KE-I than the logarithmic model, because the exponential model presented better fit for KE over 50mm/h of rainfall intensity. Meanwhile, the differences of the total kinetic energy existed in rainfall events with almost same total rainfall depth, and KE values of Daejeon at high rainfall intensity underestimated rather than the others under temperate climate. Therefore, these differences of KE in rainfall events and geographical regions imply the result from the variations of rainfall intensity within a rainfall event.