RELATING THE KBDI WITH SEA WATER INTRUSION TO FARM LAND

摘要

Myanmar is one of agricultural countries in the south-east Asia region. As the major agricultural product is rice which covers about 60% of the country's total cultivated land area. The climate is cooler in the northern mountainous area and warmer in the south with monthly mean maximum temperatures from 24.1°C to 38.2°C in May, and monthly mean minimum temperatures from 2.3°C to 20.8°C in December. The biggest productive area in the country is Ayeyarwaddy delta because of it has large region of fertile deltaic alluvial soil and abundant monsoon rainfall. However Ayeyarwaddy is the biggest rice production area; it productivity is lower than upper Myanmar. Some researchers are concluded that the water management could be the factor of less productivity. As cropping calendar in the country, the main rice is sown in rainy season (from the end of May through November) and the summer rice is sown in dry summer season. While main rice is cultivated by rain fed, the summer rice is by irrigated water. Most of the irrigated water is acquired from tributaries of Ayeyarwaddy River. Thus, the major problem occur the agricultural productivity for the lack of rainfall drainage and salt water intrusion into delta due to tidal effects in the dry season. Gradually increment of temperature in the summer season increases the salinity in the delta area and thus the salinity could affect the irrigated cultivation in the delta area. Measuring the salinity for the whole delta is time consuming for every year. Once we could be related the satellite born daily KBDI with the salinity of the sea water, it might be very useful for the monitoring the salinity in the delta area and it could be a supporting factor to increase rice cultivation productivity in the region. Thus, the study will find the relationship of satellite born daily KBDI with the irrigated agriculture productivity in the delta area causes by sea water intrusion to the farm lands. The study will map the margin line of KBDI values changes. The margin line will be used to conduct field survey for salinity. Finally the in-situ field survey data will be used in the process of finding relationship. The result will be relationship between the KBDI values and salinity. The expected result will be salinity map to monitoring sea water intrusion in the delta area.