In this paper , subjects mainly focused are as follows : to meet with the requirement of forward business and the establishment of mid - long term generation planning of hydroelectric plant , the yearly runoff and the monthly runoff are studied in this paper , providing many kinds models that suited to min - long term runoff forecast , including the time series analysis , the nearest neighbor bootstrap regressive model , the grey topological model , recession curve model , threshold auto regression , mean generating function , and ann model etc . the forecast result proves that these models are useful
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