Abstract
Reclamation areas were extracted using MNDWI, NDVI and NDSI in the lower Mekong River Basin. The 49 reclamation areas, which covers 95%, were extracted out of all 52 reclamation areas decided by visual extraction. However, in terms of some reclamation areas, only about 10% of total area were extracted because of overestimation by visual extraction. Moreover, to grasp the tendency of land reclamation, multiple regression analysis has been done. By setting the existence of reclamation area in each commune as response variable and setting the maximum water depth and the distance from the center of Phnom Penh as explanatory variable, multiple correlation coefficient was 0.34. Also field observation of water quality(T-P, COD, Heavy metal) has been done. In the floodplain affected by reclamation of waste, the value of T-P was 25 times of the value of floodplain unaffected by reclamation and the value of COD was about 4 times of the criteria for polluted water. In the floodplain affected by construction of factories, the value of iron was higher than others and it was about 21 times of the criteria of WHO at one point.
