HR: 1340h
AN: H53C-1397    [Abstracts]
TI: Field Measurements of Macroflow and Macroporosity on a Hillslope
AU: * Kwak, Y
EM: kikiken@pusan.ac.kr
AF: Pusan Nationa University, San 30 Jangjundong Jumjunggu, Busan, 609-735, Korea, Republic of
AU: Kim, S
EM: kimsangh@pusan.ac.kr
AF: Pusan Nationa University, San 30 Jangjundong Jumjunggu, Busan, 609-735, Korea, Republic of
AU: Kim, J
EM: joon-kim@yonsei.ac.kr
AF: Yonsei university, Sinchon-dong 134, Seodaemun-gu, Seoul, 120-749,
AU: Lee, D
EM: dlee@ieg.or.kr
AF: Yonsei university, Sinchon-dong 134, Seodaemun-gu, Seoul, 120-749,
AU: Kim, S
EM: sujin@koflux.yonsei.ac.kr
AF: Yonsei university, Sinchon-dong 134, Seodaemun-gu, Seoul, 120-749,
AU: Moon, S
EM: skmun2@gmail.com
AF: Yonsei university, Sinchon-dong 134, Seodaemun-gu, Seoul, 120-749,
AB: Even though the impact of macropore on the hydrological process at the hillslope scale has been widely recognized, developments and distribution of macropore have not been investigated in conjunction with the characteristics of the hillslope i.e. topography, soil property and bioactivity. In this study, macropore properties, such as macropore flow and saturation hydraulic conductivity were measured for a hillslope in Gwangneung Research Forest, located northern 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 wetness index can be obtained through the digital terrain analysis. The selected points, 19 monitoring locations, were distributed along transacts of the digital contour map. Vertical fluxes through macropores were measured using a tension infiltrometer at the depth of 10 cm from the surface. Spatial and temporal distributions of soil moisture were obtained using the on-line measurement system, TRASE, previously installed in the study area. Soil moistures for the aforementioned points were measured at 10cm and 30cm depths from the surface. The results from tension infiltrometer experiments indicate that macropore flows were ranged between 21% and 94% and Measured macroporosities were varied from 1.4% to 47%. Macropore flow and macroporosities tend to increase in the downslope direction. Analyses of seasonal soil moisture variation also explain the distribution of macropores. The increasing tendency toward the outlet can be explained by the subsurface erosion, surface and bedrock topography and bioactivities.
DE: 1625 Geomorphology and weathering (0790, 1824, 1825, 1826, 1886)
DE: 1838 Infiltration
DE: 1865 Soils (0486)
DE: 1875 Vadose zone
DE: 1895 Instruments and techniques: monitoring
SC: Hydrology [H]
MN: 2007 Fall Meeting