ความสามารถในการรองรับกรดในอ่างเก็บน้ำเขื่อนวชิราลงกรณ จังหวัดกาญจนบุรี โดยการใช้ The First-Order Acidity Balance Model A CRITICAL LOAD FOR ACIDITY OF VAJIRALONGKORN RESERVOIR IN KANCHANABURI PROVINCE BY USING A FIRST-ORDER ACIDITY BALANCE MODEL
Keywords:
Critical Load Of Acidity, Sulfur and Nitrogen Deposition, The First-Order Acidity Balance (FAB) ModelAbstract
This study estimates the critical load (CL) of acidity for Vajiralongkorn reservoir, Kanchanaburi province by the first-order acidity balance (FAB) model, which bases its calculation on the steady state mass balance between sinks and sources of sulfur and nitrogen. The data required for calculation can be classified into two groups: direct and indirect data. Direct data is that which can be collected directly from sources of information. These include catchment area, forest in the catchment area, lake area and sulfur and nitrogen depositions. The indirect data are the estimated values, annual run off, sulfur and nitrogen uptakes, and base cation concentrations at a pre-industrial rate.
The results estimate of data used to calculate the critical load of acid, nitrogen uptake was 9,980 eq/ha/yr, annual runoff was 1.15 m/yr and annual averages of sulfur and nitrogen depositions were 121.96 and 85.09 eq/ha/yr, respectively. The deposition monitoring amount in Kanchanaburi was 4 times lower compared with Bangkok. Depending on the quality of input data, their sensitivity, and the complexity of the FAB model, a value for acid neutralizing capacity (ANC) limit of 20 μeq/liter was used to calculate CL. To ensure no damage to fish. The critical load of acidity (sulfur and nitrogen) in the Vajiralongkorn reservoir was 6.637 keq/ha/yr.
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