HR: 0830h
AN: H51D-1100    [PDF]
TI: Overlandflow generation and surface erosion in Mongolia
AU: * Onda, Y
EM: onda@atm.geo.tsukuba.ac.jp
AF: Institute of Geoscience, University of Tsukuba, 1-1-1 Tenno-dai, Tsukuba, 305-8571 Japan
AU: Nishikawa, T
EM: s023557@icho.ipe.tsukuba.ac.jp
AF: Institute of Geoscience, University of Tsukuba, 1-1-1 Tenno-dai, Tsukuba, 305-8571 Japan
AU: Kato, H
EM: hiros980@zae.att.ne.jp
AF: Institute of Geoscience, University of Tsukuba, 1-1-1 Tenno-dai, Tsukuba, 305-8571 Japan
AU: Tanaka, Y
EM: ytanaka@khu.ac.kr
AF: Department of Geography, Kyung Hee University, 1Heogi-dong, Dongdaemun-gu, Seoul, 130-701 Korea, Democratic People's Republic of
AU: Tsujimura, M
EM: mktsuji@atm.geo.tsukuba.ac.jp
AF: Institute of Geoscience, University of Tsukuba, 1-1-1 Tenno-dai, Tsukuba, 305-8571 Japan
AU: Davaa, G
EM: gdavaa@yahoo.com
AF: Institute of Meteorology and Hydrology Mongolia, P.O. Box 150, Ulaanbaatar-36, Ulaanbaatar, 36 Mongolia
AU: Oyunbaatar, D
EM: oytetuar@yahoo.com
AF: Institute of Meteorology and Hydrology Mongolia, P.O. Box 150, Ulaanbaatar-36, Ulaanbaatar, 36 Mongolia
AB: In Mongolia, significant soil erosion is thought to be caused by overgrazing and unsuitable management. Soil erosion also make desertification, a key issue of environmental concern. However, very few field data are available on overland flow mechanism, soil erosion processes and amount and the desertification processes. The purpose of our research project (2001-2006) is to study and assess the state and the causes of soil erosion through the monitoring of overlandflow flow and soil erosion. The study site locate 60-100 km east of Ulanbaatar. One site is Kherlen Bayaan Ulaan (KBU), and the other site is Baganuur (BG). The drainage area of the watershed is 7.1 ha and 8.0 ha, and relative height is 105 m and 160 m, respectively. Parshall flumes and sediment traps were installed at the outlet of the catchments. Also we established 2 hillslope plots (50m x 50 m) in each area in which one is surrounded by fens. Discharge flow plots were monitored by Parshall flumes, and tensiomters, raindrop impact sensors, wind velocities were also recorded. About 50 Soil cores were sampled in each catchments and Cs-137 analysis were conducted. The runoff peak in 2003 in KBU is greater than BG. Through the Cs-137 analysis, long term soil erosion is very significant throughout the catchment is KBU, but deposition area were detected downslope of the catchment and lower overall erosion rate in BG. These data suggest the overlandflow erosion is significant in the study area, but importance of surface erosion varied between place to place.
DE: 1800 HYDROLOGY
DE: 1809 Desertification
DE: 1815 Erosion and sedimentation
DE: 1824 Geomorphology (1625)
DE: 1860 Runoff and streamflow
SC: Hydrology [H]
MN: 2003 Fall Meeting