Abstract:
Water is a major factor affecting the growth and agricultural productivity. However, as the current environmental and climate change affects the variation in the amount of water used in agriculture in many areas of Thailand. This research aims to focus on a survey of 22 water resources in Chanthaburi province by collecting satellite images and data on field water resources 2 times for each water resource, the first being the late rainy season(Aug-Dec) and the second time is the drought period (Feb-Jul), which consists of name and location of the water resource, water area, average water depth, water volume and date of data collection. The information of surveyed and collected water resources found that when considering the volume of the water resource, it can be divided into two water resources with a volume of more than 100 million cubic meters, six water resources with a volume of 1-100 million cubic meters, and 14 water resources with a volume less than 1 million cubic meters. From collecting water depth data over two time periods, differences in water depth were found. At the end of the rain, there will be a water resource with a mean depth in the range of 2.29-56.66 meters and at the end of the drought there will be a water resource with a mean depth in the range of 1.05-35 meters. It showed that water volume decreased during the dry season. In particular, large water resources have a nearly 50 percent decrease in volume, while smaller water resources won't change much. All the collected data were then used to find the relationship between the water data and the satellite images, which found the relationship between the water volume of the water resource and the water surface extracted from the satellite images. All the collected data will be compiled into a water resource database and presented in an online geographic information system.