한국농림기상학회지, 제 9권 제4호(2007) (pISSN 1229-5671, eISSN 2288-1859)
Korean Journal of Agricultural and Forest Meteorology, Vol. 9, No. 4, (2007), pp. 234~246
DOI: 10.5532/KJAFM.2007.9.4.234
ⓒ Author(s) 2014. CC Attribution 3.0 License.


광릉 산림 소유역에서의 대공극흐름율과
유효대공극부피분율의 공간 분포

곽용석(1), 김수진(2), 김 준(2), 임종환(3), 김상현(1)
(1)부산대학교 환경공학과,
(2)연세대학교 대기과학과/지구환경연구소, (3)국립산림과학원

(2007년 10월 10일 접수; 2007년 11월 23일 수락)

Spatial Distribution of Macropore Flow Percentage and
Macroporosities in the Gwangneung Forest Catchment

Yong-Seok Gwak(1), Su-Jin Kim(2), Joon Kim(2), Jong-Hwan Lim(2), Sanghyun Kim(1)
(1)Department of Environmental Engineering, Water resource and Environmental Laboratory,
Pusan National University, Busan, 609-735, Korea
(2)Department of Atmospheric Sciences/Global Environment Laboratory,
Yonsei University, Seoul, 120-749, Korea
(3)Korea Forest Research Institute, Seoul, 130-712, Korea

(Received October 10, 2007; Accepted November 23, 2007)

ABSTRACT
The role of macropore in the hydrological processes is important at the hillslope scale. Developments and distribution of macropores have not been investigated in conjunction with the characteristics of the hillslope such as topography, soil property, and soil moisture. In this study, macropore properties, such as macropore flow and saturation hydraulic conductivity were measured at a hillslope located in Gwangneung Research Forest, Pochun-gun, Gyeonggi-do, South Korea. An intensive field survey provided a refined Digital Elevation Model (DEM) for surface and subsurface topography. Spatial distributions of upslope area and topographic index were obtained through the digital terrain analysis. The total number of monitoring points was 22, and the selected points were distributed along the transect of the digital contour map. Vertical fluxes through macropores were measured using a tension infiltrometer at the depth of 0.1 m from the surface. Spatial and temporal distributions of soil moisture were obtained using an on-line measurement system, TRASE, installed in the study area. Soil moisture for the aforementioned points was measured at 0.1 and 0.3m depths below the surface. The results from tension infiltrometer experiments present that the macropore flows ranged between 21 and 94%, and the measured macroporosities varied from 1.4 to 47%. Macropore flows and macroporosities tended to increase as the measurement location moved to downslope. The ability for water conduction through macropores becomes increasingly developed as the location approaches the outlet of the hillslope.

Keyword: Macropore, Tension infiltrometer, Soil moisture, Time domain reflectometry

MAIN

적요

대공극은 불포화대에서 토양으로의 침투와 유출에 상당한 기여를 한다. 본 연구에서는 광릉 슈퍼사이트 내 산림 소유역을 대상으로 사면에서의 대공극의 공간적 발달에 대해 알아보았다. 장력 침투계를 이용하여 침투과정 중 대공극의 상대적인 중요성을 대공극흐름율과 유효 대공극부피분율을 기준으로 평가하였다. 체계적인 공간적 분석을 하기위해 대상사면의 수치지형도를 구하여 등지형지수지도를 기준으로 실험 지점을 선정하였다.
토양의 물리적 특성은 공간적으로 고르게 분포되어 있었지만 흐름선이 원두부로 접근하고, 기여사면 면적이 증가할수록 대공극흐름율과 유효대공극부피분율이 증가하는 경향을 보였다. 이는 대공극형성요인 중에 지중침식, 생물학적 활동, 수리적 환경, 토양층의 발달 및 기반암의 구조의 영향으로 생각된다. 본 연구의 결과는 광릉 산림과 같은 복잡 경관에서 강우사상에 따른 토양수분의 공간분포 및 이송, 유출과정이 물순환에 미치는 영향을 이해하고 정량화할 수 있는 자료 기반을 제공할 것으로 기대된다.

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