Laboratory of Erosion Control(2001)
Laboratory of Erosion Control
Staff Professor: Mizuyama, Takahisa, Dr. Agric. Sci.
Associate Professor: Fujita, Masaharu, Dr. Eng.
Instructor: Kosugi, Ken'ichirou, Dr. Agric. Sci.
Students and research fellows
Doctor's program: (3) Research fellow: (1)
Master's program: (4)
Undergraduate: (7)
A. Research Activities(2001.1-2001.12)
A-1. Main subjects
a) Mechanism of sediment movement
Basic research has been carried out on debris flow, flash flood, and shallow landslide. The relationship between shallow landslide and underground pipe flow is studied particularly.
b) Countermeasures to prevent or reduce sediment disasters and the Sabo-planning being compatible with environmental concerns. More effective permeable dams are experimentally investigated in order to store the excessive sediment and, at the same time, not to damage the eco-system established in the streams. A function of a series of slit sabo dams was studied by flume experiments and computer simulation. Influence of released sediment from sabo dams to downstream environment is investigated by field experiments.
c) Forest influence on the hydrologic cycle
Elements controlling hydrologic cycle in forest are studied. Effects of forest soil hydraulic properties on water discharge from forested watersheds are analyzed by laboratory experiments, field measurements, and numerical simulation methods. Evapo-transpiration is one of the major factors. Models to interpret the phenomena are built.
d) Erosion and vegetation recovery in devastated granite mountains
Comparative study is carried out in Southwest China and Japan. Influence of human activities to erosion is a research topic.
e) Environment of mountain streams
Pools in mountain streams play an important role as habitat for fish. The geometrical and hydraulic features of pools are investigated and the situation of habitat of fish is observed. The formation process of pools is investigated theoretically and observationally with a focus on step-pool system in mountain streams.
f) Sediment movement and integrated sediment management in river system
Sediment production process and sediment movement process in mountain region are investigated using a video camera system and turbidity meters. A numerical model for calculating sediment routing is also developed. Using these results, the sediment management for mitigating sediment-related disaster and providing better natural environment from mountains to seashore is studied.
g) Sediment related disasters
Debris flow disasters were surveyed in Venezuela where debris flows and landslides occurred in December, 1999. Following debris flows from landslides, landslide dams and other damages by September 21 Taiwan Earthquake were surveyed in the field. Mudflow was studied in Miyake Island after eruptions.
h) Buffer green belt against sediment hazards
The effects of trees against debris flow and landslide are studied to design buffer green belts. Infiltration and water storage characteristics are studied in different tree kinds.
A-2. Publications and presentations
a) Publications
Books
Original papers
Oda,A., Watanabe,F., Yanagisawa,K., Nakaya,M., Mizuyama,T., Abe,H.: Hydraulic modelexperiment on the Sabo dam with conduit, Journal of Japan Erosion Control Engineering Society (JECES)53-5, 52-56,2001
Honda,N., Mizuyama,T.: Greenbelt for debris flow control, JECES 53-6, 27-36,2001
Sato,K., Uehara,S., Mizuyama,T., Kasai,S.: Structural behavior of open type steel dam hit by stony debris flow, JECES 53-6, 61-65,2001
Kosuge,Y., Mizuyama,T.: study on the reduction in grain sizes of river bed material being in down stream transport, JECES 54-1, 39-47,2001
Araki,Y., Masuda,E., Mizuyama,T.: movement of debris flow by eyewitness reports from the June 29 Hiroshima debris flow disaster in 1999, JECES 54-1, 72-76,2001
Taniguchi,F., Ogawa,K., Eguchi,M., Yamaguchi,K., Mizuyama,T., Kosugi,K.: A change of the critical rainfall triggering shallow landslides in the fallen tree slopes, nara Prefecture, JECES 54-1, 77-80,2001
T.Uchida, K.Kosugi and T.M.(2001)Effects of pipeflow on hydrological process and its relation to landslide: a review of pipeflow studies in forested headwater catchments,
Hydrologial processes 15, 2151-2174
Kimoto,A.,Mizuyama,T.,Okano,K.,Kusaka,S.:Long-term change of the bare slopes of Tanakami Mountains using aerial photographs and digital terrain models, Journal of Japan Erosion Control Engineering Society (JECES)54-3, 14-22,2001
Yamakoshi,T.,Mizuyama,T.,Suwa,H.,Okunishi,K.,Nakano,M.,;A two-decade hydrologic change at the source area of Kamikamihori Gully, Mount Yakedake, Journal of Japan Erosion Control Engineering Society (JECES)54-4, 22-32,2001
Michihata,R.,Uchida,T.,Kosugi,K.,Mizuyama,T.; An observation of soil pipe morphology at Toinotani hollow in Kyoto University Forest in Ashiu, Forest Research, Kyoto No.73,p.67-70,2001
Kosugi, K., Katsuyama, M.; Measurements of groundwater recharge rate and unsaturated convective chemical fluxes by suction controlled lysimeter, In: Impact of Human Activity on Groundwater Dynamics (Proc. Maastricht Symp., July 2001), IAHS Publ., 19-24, 2001.
Kosugi, K., Mori K., Yasuda H.; An inverse modeling approach for the characterization of unsaturated water flow in an organic forest floor, Journal of Hydrology, 246, 96-108, 2001.
Tuli, A., Kosugi, K., Hopmans, J.W.; Simultaneous scaling of soil water retentin and unsaturated hydraulic conductivity functions assuming lognormal pore-size distribution, Advances in Water Resources, 24, 677-688.
Reviews
Mizuyama,T.: Flood and debris flow disaster in Venezuela,C.2.3,4 JSCE Hydraulic Committee, 2001
Mizuyama,T.: Some research topics on debris flow and shallow landslide, 2nd IAHR Symposium on River, Coastal and Estuarine Morphodynamics, Obihiro, Japan, 2001
b) Conference and seminar papers presented
The 111th annual meeting of Japanese Forestry Society (7 presentations)
2001 annual meeting of Japan Society of Erosion Control Engineering (16 presentations)
2001 annual conference of Japan Society of Civil Engineers (1 presentation)
2001 annual meeting of Japan Society of Hydrology & Water Resources (2 presentations)
A-3. Off-campus activities
Membership in academic societies(roles)
Mizuyama, T.: Japan Society of Erosion Control Engineering (director, Director of Business Department), Japanese Geomorphological Union (member of committee), Japan Society of Revegetation Technology (councilor)
Fujita, M.: Japan Society of Erosion Control Engineering (member of editorial committee), Japan Society of Civil Engineers(member of environmental hydraulics section)
Research grant
Monbusho research grant:
International; Water-Man-Earth Interactions and Sustainable Water Resources -Cooperation in East Asia and Oceania (Mizuyama), General scientific research (B)(2); Joint Research on control of floods and sediment movement in Semalang, Brantas and Toba Basins (Fujita), General scientific research(C)(2); Sediment Run-off from sabo dams and its impact on river environment (Head: Fujita, Mizuyama), Encouragement (A); Development of a new sampling method of vertical infiltration water in unsaturated soil for analyzing solute transport in forest soils (Head: Kosugi)
A-4. International cooperation and overseas activities
International Meetings
Mizuyama,T.: INTERPRAEVENT 2000, Austria (Chairman, Presentation), 2nd International Debris Flow Workshop, Taiwan (Chairman, Presentation), International workshop on mountain disaster documentation, Italy (Presentation), Japan-Italy sabo conference, Italy (Chairman, Presentation)
Fujita, M.:12th Congress of APD, IAHR, Thailand (Presentation), Gravel-bed rivers 2000, New Zealand (Participation)
Kosugi, K.: IAHS Symposium on Impact of Human Activity on Groundwater Dynamics, Maastricht, Nederland,(Presentation)
Membership in international academic societies
Mizuyama, T.: IAHR, IAHS, IUFRO-J, International INTERPRAREVENT, International Erosion Control Association
Kosugi, K.: SSSA, IAHS, IUFRO-J
International joint researches, overseas research surveys
Mizuyama, T.: Research on erosion in granite mountains (China)
Fujita, M.: Joint Research on control of floods and sediment movement in Semalang, Brantas and Toba Basins (Indonesia)
Editors of International Journals
Mizuyama, T.: Editor of Journal of Hydrological Sciences
B. Educational Activities (2000.4-2001.3)
B-1. On-campus teaching
a) Courses given
Undergraduate level: Regional Environment Creation (Mizuyama), Theory of Erosion Control 1,2 (Mizuyama), Practice in Erosion Control (Mizuyama, Fujita), Planning of Erosion Control (Mizuyama, Fujita), Foreign Literature in Forestry 3 (Mizuyama, Fujita), Practice of Surveying (Fujita), Special Seminar on Erosion Control 1,2 (Mizuyama, Fujita), Science of Water, soil and vegetation (Fujita)
Graduate level: Advanced theory of Erosion Control (Mizuyama), Advanced experiment of Erosion Control (Mizuyama, Fujita), Seminar of Erosion Control (Mizuyama, Fujita)
B-2. Off-campus teaching, etc.
Part-time lecturer
Mizuyama, T.: Fac. Agriculture, Kyoto Prefectural Univ. (Materials and constructive methods), Kohchi Univ. (Sabo Engineering), Japan International Co-operation Agency (Infrastructure)
Fujita, M.: Fac. Engineering, Ritsumeikan Univ. (Experiment of Civil Engineering I&II), Japan International Co-operation Agency (Volcanology and volcanic sabo)