DELINEATION AND MONITORING OF GULLIED AND RAVINOUS LANDS IN A PART OF LOWER CHAMBAL VALLEY, INDIA, USING REMOTE SENSING AND GIS

摘要

Chambal Valley of India is particularly well known for its characteristic deep-cutting ravines, which has been spreading over the usable land at an alarming rate. The damage to the agricultural land by network of gullies and later its conversion to deep ravines is a serious concern to the scientific community since long back. A part of the Chambal Valley is considered for the present study with the main objective to delineate and monitor the gullied and ravenous lands with the help of multi temporal remote sensing data and GIS. The delineation of ravinous land has been accomplished initially from Survey of India topographic base map (1985) and IRS-1B (1996) data. Subsequently, employing various digital enhancement techniques to IRS-1C LISS Ⅲ and PAN (1998) data, updated ravine-affected area in the study area has been delineated and various ravine classes based on their average depth have been categorized. Principal component transformation to all four bands of LISS Ⅲ data and generation of FCC from first three principal components, and finally fusion of LISS Ⅲ and PAN data by principal component analysis (PCA) have been employed in this work. Finally, from the multi temporal data sets, viz., Survey of India topographic base map (1985), IRS-1B LISS Ⅱ (1996) and IRS-1C LISS Ⅲ and PAN (1998) data, an attempt has been made to study the advancement and recession of ravines in the study area by using the Integrated Land and Water Information System (ILWIS) 2.2 software. It has been observed that the affected area during the 15 years time period (1984-1998) has been increased from 35.37 % to 38.94- % of the study area. The actual spreading rate at different localities in the study area was recorded from the local villagers and compared with the result obtained from remote sensing techniques. The result obtained from this study is found to agree significantly well with the actual figures collected during field investigation.