Applicability Study on Monthly Water Quantity Estimate Method in the Ungaged River
The estimate of monthly water volume in the ungaged river is an important support for the most stringent water re-sources management system.Based on the principle of hydrological similarity and water balance,the rationality analysis standards of runoff modulus method,runoff coefficient method,regional water balance method and the rationality analysis standard of esti-mate results were proposed.Taking the existing hydrological station as the hypothetical section,the water volume of the hypotheti-cal section was estimated by using the data of the reference hydrological station,and the application scope of the three methods was analyzed and verified.The runoff modulus method is applicable to the case that the difference of catchment area is no more than 20％and the case that the difference of catchment area is between 20％and 1 time when considering the variable of inter-val water storage and discharge.The runoff coefficient method is applicable to the situation that the difference of catchment area is between 20％and 1.5 times and there is flood process in the estimate period;The interval water balance method is applicable to the case that the area ratio of upstream and downstream reference hydrological stations is less than 3 times;"the relative devia-tion of the two methods is less than 18％"is feasible.
the strictest water resources management systemungaged riverwater quantity evaluationestimate methodapplicabil-ity study
万方数据
维普
