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the Er Tan hydro electric WL of the largest Hydro electric power plant
in South-west China, Such as:the study of regional stability of the dam site
and tunnelsthe study of landslide, mud rock flow and hydrogeologic nature in
the region of reservoir,
5¢« The Calculation of Runoff,
Landsat imagery are used to calculate runoff in the Wen Yu He River,
the 1:500,000 scale geologic map and illustrate of plant classification are
referenced, thi¥ty representative small basins are selected, the remote sen-
sing information are plenty, the geology, geomorphology, forest, vegetation
cover are classified, then runoff” are calculated in the typical basin, subs-
titube runoff coefficient into corresponding region of the Wen Yu He River,
runoff is calculated, its area is 1800 km“, the accuracy of calculated runoff
can be reached 88%, this is a good method for the region where the hydro-
logic data are lacking it also shows that the layout of hydrometric station
should consider tkeloguditions of geology, geomorphology, and vegetation oo-
ver instead of topography as the only consideration, Thus the number of hydro-
metric station may be reduced, and the calculated runoff more accurate in
regions where the hydrologic data are lacking,considering different runoff
characteristics in different zone of geology and geomorphology. One Landsat
image covers an area of 185 km“ on the ground, its sight is wide, it can dis-
play more complete imagery of the earth, such as: geology, lineament, geomor-
phology, river system, water boby, etc, ; .
6. Study of cooling water at Tai Yuan and Dou He thermal electric
power plant by thermal IR image and density slicing. Some achievement are
gained,
To Study of Dongting lake, the second largest freshwater lake of China
by STC/1%5 "101 digital image procossing system, Now the color photo-mosaic
and ratio image are made,
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