首页 | 本学科首页   官方微博 | 高级检索  
     检索      


Drainage reversal in dharmapuri area in tamilnadu and its effects
Authors:L S Suryanarayanan  P Prabhakara Rao
Institution:1. Geological Survey of India, Madras
Abstract:Anomalies have been noticed in the Nagavati River and the Semmandakuppam ar drainage systems of the Dharmapuri area in the form of abrupt changes in the drainage pattern, elbow turning of tributary streams etc. On a detailed geomorphological study of the area using air photos, it has bsen observed that the anomalous situation is due to successive stages of development of the Nagavati R. at the cost of Semmandakuppam ar in the overall evolution of the landforms in the area. The Nagavati R. apppears to have originated as a very minor obsequent stream at an escarpment bank of the Cauvery R. which has been flowing in the southern part of the Dharmapuri pediplain. Owing probably to the uplift of the area and a concommittant reactivation of a regional shear, the Nagavati R has made successive headward advances into the pediplain, and in the process, has captured the upper reaches of the Semmandakuppam ar which is a tributary to the Ponnaiyar R. that drains the uplifted pediment even at present. The process of dissection and headward erosion by the Nagavati R. is still active and could possibly lead to a total capture of the Semmandakuppam ar and even the diversion of the Ponnaiyar R. head-waters into the Cauvery system. Of imminemt concern is the fast spreading badland which is developing at the head of the Nagavati R. at the expense of valuable agricultural land and a highway lying immediately west of the Dharmapuri town.
Keywords:
本文献已被 SpringerLink 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号