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在制定水文测验规范工作中,规定合适的精度指标,是一项重要内容。理想情况是建立一个精度分析系统。它可由三个子系统组成。实测精度分析系统——分析测验、整编成果的精度。以流量测验为例,从测深、测距、测速及水位诸分量的误差与测站特性,可以求得单次实测流量以及整编出的瞬时和时段流量的误差,这就是资料的“实际精度”。也可反向计算,按对成果的精度要求反推各分量的精度指标及其合理分配。推算精度分析系统——分析水文预报、水文分析计算成果的精度。如在降水径流预报方案中,可以根据实测降水、流量的误差和关系不确定因素推算预报值的误差。在正常年径流的计算中,可以根据实测径流和水文调查资料的误差及资料系列
In the development of hydrological test norms, the provisions of the appropriate accuracy index is an important part. The ideal situation is to establish a precision analysis system. It can be composed of three subsystems. Measurement accuracy analysis system - analysis and testing, reorganization of the results of precision. Taking the flow test as an example, from the errors of sounding, distance measuring, velocity measuring and water level components and the characteristics of the station, we can find the errors of the single measured flow and the integrated flow of the transient and the time. This is the actual data Precision ". Can also be calculated in reverse, according to the accuracy of the results required to reverse the precision of the various components of the index and its rational distribution. Estimation accuracy analysis system - Analysis of hydrological forecast, hydrological analysis of the accuracy of the results. For example, in the precipitation runoff prediction program, the error of the forecast value can be calculated according to the measured rainfall, the error of the flow rate and the uncertainty of the relationship. In the calculation of normal annual runoff, it can be based on measured runoff and hydrological survey data error and data series