Effect of land use change on some hydrological characteristics of Yom river basin
1995
Somkiat Susunpoontong
Watershed Class 1A took the highest proportion in the upper and mid basins while Watershed Class 5 took the highest proportion in the lower basin. Changes in land-use patterns during the period resulted in the decrease in forest area from 96.52, 92.60 and 75.29 to 84.61, 78.90 and 53.84 percent in the upper, mid and lower basins, respectively. The greatest decrease occurred in Watershed Class 5 in all the three basins and Watershed Class 4 was second for the decrease. Most of the forest areas were changed into agricultural and urban areas. It was also found that average annual rainfall and streamflow had continuously trended downwards. However, the wetflow trended to increase during the rainy season while the dryflow trended to decrease during the dry season. The rainfall-streamflow relationship was significantly in direct proportion to each other in every basin. The decrease in the forest area favors the increase in the wetflow during the rainy season but causes dryflow decrease during the dry season. This will lead to flooding during the rainy season and drought during the dry season. However, the water shortage in the dry season is more due to the increasing water demand for agricultural and domestic uses than to effects of land-use changes. Dam construction should, therefore, be taken into consideration to solve such problems.
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