HR: 0800h
AN: H21A-0167 [Abstracts]
TI: Nonlinearity of basin response with respect to watershed size and storm magnitude
AU: * Lee, K
EM: ktlee@ntou.edu.tw
AF: Dept. River & Harbor Engrg.
National Taiwan Ocean University, No. 2 Peining Road, Keelung, 202, Taiwan
AU: Chen, N
EM: d93520009@mail.ntou.edu.tw
AF: Dept. River & Harbor Engrg.
National Taiwan Ocean University, No. 2 Peining Road, Keelung, 202, Taiwan
AU: Gartsman, B L
EM: gartsman@tig.dvo.ru
AF: Pacific Institute of Geography, Russian Academy of Science, Radio st. 7, Vladivostok,
690041, Russian Federation
AB:
The objective of this study is to investigate the nonlinear characteristics of the basin response with respect to
watershed size. Watershed geomorphologic and hydrologic data from Komarovsky, Centralny, Sadovy, and
Saharny Zavod watersheds in the Komarovka Basin of Russia were collected for analysis. A kinematic-wave-
based geomorphologic instantaneous unit hydrograph (KW-GIUH) model was adopted as an auxiliary tool to
demonstrate the nonlinear characteristics.
The results show that the linearity of the basin response with respect to watershed size is shown in small
watersheds especially for large storm events. On the contrary, nonlinearity prevails in large watersheds with
small storms. Moreover, the transition break for the basin response transferring from linear to nonlinear in the
collecting area vs. peak discharge graph was detailed investigated. A numerical experiment was performed, from
the most upstream point of the watershed along the mainstream to the downstream outlet, to investigate the
variation of the collecting areas. The results show that once a large tributary is confluence into the mainstream,
the collecting area shows an abrupt change in the graph of the collecting area vs. distance to downstream outlet.
The collecting area corresponding to the abrupt change is just the transition break from linear to nonlinear in the
graph of the collecting area vs. peak discharge. This finding can be well simulated by the KW-GIUH model and
has been verified by using the hydrological records.
DE: 1804 Catchment
DE: 1821 Floods
DE: 1824 Geomorphology: general (1625)
DE: 1839 Hydrologic scaling
DE: 1847 Modeling
SC: Hydrology [H]
MN: 2007 Fall Meeting