Abstract
The transportation of sediment and nutrients in the lower Mekong basin was studied. The influence of a dam in the mainstream on the downstream area was analyzed by comparing data from before and after construction. No change of discharge was seen in the downstream area. However, the suspended sediment flux decreased significantly, and its ratio of decrease was higher near the dam. The daily data of suspended flux and nutrient flux was estimated from the relationship among the discharge and the suspended and nutrient fluxes. The balance of sediment and nutrients was calculated, and maps of their transportation were created. The tendency of deposition and erosion could be understood. Most suspended sediment of the mainstream was supplied from the upstream area of Chiang Saen. In contrast, all phosphorus was supplied from the tributaries and the river channel.
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