Volume No. 7 Issue No.: 1A Page No.: 504-511 July-September 2012

 

APPLICATION OF REMOTE SENSING AND GIS TECHNIQUES IN UNDERSTANDING CHANGES IN MANGROVE COVER IN PARTS OF INDUS DELTA AROUND KORI CREEK, GUJARAT, INDIA

 

Kumar Mohit*, Chauhan H.B., Rajawat A. S. and Ajai

Marine, Geo and Planetary Sciences Group, Space Applications Centre (ISRO), Ahmedabad (INDIA)

 

Received on : July 05,2012

 

ABSTRACT

 

The Indus river delta comprises of 17 major and numerous minor creeks, vast expanses of mudflats and dense patches of fringing mangroves. The Indus deltaic mangroves are considered to be unique because they form the largest block of arid climate mangroves in the world. The Indian part of the delta, around Kori Creek, boasts of more than 65% of the total mangrove cover of Gujarat state, India. Due to changes in the coastal processes in the deltaic environment and anthropogenic activities in the catchment area of the Indus river as well as in the coastal region, mangroves are under constant threat of being wiped out. Therefore, it is imperative that these ecosystems be continuously monitored so as to plan a suitable conservation strategy for them. This study reports changes in mangrove cover over a period of 45 years in a part of the delta using multi-date and multi-sensor satellite data and old topographical maps. The study area forms south eastern part of the Indus delta near Kori Creek in Gujarat. It is located in the north-western part of Kachchh district, comprising region between Narayan Sarovar and Jakhau, in particular. Topographical maps of 1965-66 time frames, Coastal Zone Information System (CZIS) data base prepared using 1989-1991 satellite data available at SAC and IRS-1D LISS-III for 2001, LANDSAT 7 ETM+ for 2006 and IRS-P6 LISS-III data for 2010 were utilized for the analysis. The study observes that during the time frame 1965-66 to 2006 mangrove area has reduced by 11.38 sq km in the study region. Most of the degradation took place around Narayan Sarovar, Sindhodic Creek, Chukh Creek, Kharia Creek and Godia Creek. The causes of degradation seem to be dynamic coastal processes occurring in the Indus deltaic environment over 45 years period and increased anthropogenic pressures. Changes in the coastal geomorphology, in particular changes in mudflat regions in Sugar Creek and Sindhodic Creek and erosion near Narayan Sarovar-Koteshwar are observed to have caused reduction of mangrove cover in this area. Development of salt pan activities has led to depletion in mangrove cover around Kharia and Godia Creek. Mangrove cover in the study region has increased during the time frame 2006-2010 by 8.26 sq km, in particular in regions such as east of Sethwara and Ogata bet. This might be because these areas are relatively sheltered and less affected by the influence of dynamic coastal processes and anthropogenic activities

 

Keywords : Indus delta, Mangroves, Kori Creek, Remote Sensing, GIS, Anthropogenic pressures

 

 

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