Based on the flood level frequency curve, hydrological failure risk was divided into flood overflowing risk and flood overtopping risk.
基于推求的洪水位频率曲线，将堤防水文失事风险分为洪水漫溢风险和洪水漫顶风险。
This is the first research on the evaluation model of the level of urban greening characterized by frequency curve of green rate with the technique of aerial remote sensing and computers.
本文首次探讨并提出了应用航空遥感和计算机技术建立以绿化覆盖率频数曲线为特征的城市绿化水平评估模式。
Because the accumulative frequency curve is plotted artificially, there exists arbitrariness in determining the design water level.
由于其缺乏理论曲线，因此，确定的数值存在任意性。
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