河系網과 地質構造線의 關係에 對한 硏究(洛東江流域을 例로 하여)

Abstract

It has been knoNn that the tectolineaments influence the drainage patterns of river basins, but no detailed study on this problem has been so far made in Korea, because it is very difficult to find out the tectolineaments in the field due to complicated geologic history of Korea, the deep weathered zone of the surface rocks, and the relatively ancient tectonic movements which ended mostly by the end of Mesozoic. However, thanks to the newly developed remote sensing techniques-especially Landsat Image Analysis-we recently have been able to trace the tectolineaments in the Naktong River Basin more accurately and mapped it with good results. In this paper the tectolineaments of the 4 large sub-drainage basins of Naktong River Basin (Nam, Kumho, Banbyun, Naesung) were analysed with reference to its direction and size in order to understand its general characters and compared with the drainage patterns of the above 4 river basins. The results of the study are a-s follows: 1) The directions of the tectolineaments aremostly Sinian which strikes NNE-SSW 2) The Naesung River Basin, composed mainly of Coarse granitic gneiss having feldspar as its main component and of the Jurassic granite, has less L/l ratio (ratio of the total length of river to the length of portion of river which flows along or in the tectolineaments), which is attributed to the thick weathered zone and widespread alluvium in this river basin.