국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Characterization of Terrestrial Water Dynamics in the Congo Basin Using GRACE and Satellite Radar Altimetry
저자	Lee, Hyongki;; Beighley, R. Edward;; Alsdorf, Douglas;; Jung, Hahn Chul;; Shum, C. K.;; Duan, Jianbin;; Guo, Junyi;; Yamazaki, Dai;; Andreadis, Konstantinos
Keyword	AMAZON REGION (SOUTH AMERICA); DRAINAGE;; FLOOD PLAINS;; HYDRODYNAMICS;; HYDROLOGY;; IMAGING SPECTROMETERS;; MODIS (RADIOMETRY); REMOTE SENSING;; RIVERS;; SATELLITE ALTIMETRY;; WETLANDS
URL	http://hdl.handle.net/2060/20110023465
보고서번호	GSFC.JA.5385.2011
발행년도	2011
출처	NTRS (NASA Technical Report Server)
ABSTRACT	The Congo Basin is the world''s third largest in size (approx.3.7 million sq km), and second only to the Amazon River in discharge (approx.40,200 cu m/s annual average). However, the hydrological dynamics of seasonally flooded wetlands and floodplains remains poorly quantified. Here, we separate the Congo wetland into four 3deg 3deg regions, and use remote sensing measurements (i.e., GRACE, satellite radar altimeter, GPCP, JERS-1, SRTM, and MODIS) to estimate the amounts of water filling and draining from the Congo wetland, and to determine the source of the water. We find that the amount of water annually filling and draining the Congo wetlands is 111 cu km, which is about one-third the size of the water volumes found on the mainstem Amazon floodplain. Based on amplitude comparisons among the water volume changes and timing comparisons among their fluxes, we conclude that the local upland runoff is the main source of the Congo wetland water, not the fluvial process of river-floodplain water exchange as in the Amazon. Our hydraulic analysis using altimeter measurements also supports our conclusion by demonstrating that water surface elevations in the wetlands are consistently higher than the adjacent river water levels. Our research highlights differences in the hydrology and hydrodynamics between the Congo wetland and the mainstem Amazon floodplain.