The knowledge of space and time distribution of short duration rainfall depths is of primary interest in hydrotechnical studies and in extreme floods modelling. This work is carried out to establish a ＂DDF （Depth-Du...The knowledge of space and time distribution of short duration rainfall depths is of primary interest in hydrotechnical studies and in extreme floods modelling. This work is carried out to establish a ＂DDF （Depth-Duration-Frequency）＂ relationship for the region of Annaba （Northeast of Algeria） through the examples of Pont Bouchet （El Hadjar）, Ain Berda and Chafia-Dam rainfall gauges. The results of the frequency study of stochastically generated annual series （Pearson＇s distribution type III model） and the regression analysis （least square method） permitted to develop a master curve that well describes heavy rainfalls distribution in the Annaba region. This 2-parameter model is used to predict, with sufficient accuracy, the amount of rain that could be recorded over a shorter duration from daily rainfall data in basins that lack recording rain gauges.展开更多
对九寨沟国家公园中的公路和游客栈道进行了人工降雨试验的设计、操作和测试数据分析。模拟试验选择6处公路和栈道试验区,采用人工降雨方法模拟雨量出现概率60%、历时30 m in的降雨。试验按3 m in间隔对各试验场降雨径流带出的总磷负荷...对九寨沟国家公园中的公路和游客栈道进行了人工降雨试验的设计、操作和测试数据分析。模拟试验选择6处公路和栈道试验区,采用人工降雨方法模拟雨量出现概率60%、历时30 m in的降雨。试验按3 m in间隔对各试验场降雨径流带出的总磷负荷进行现场监测。研究结果提供了在具有代表性的降雨条件对总磷营养物输出的定量估计。尤其对公路和栈道降雨径流特征获得了认识:污染物初始冲刷浓度期延续约3 m in;在降雨强度不变的情况下,污染物负荷率接近常量。大部分污染物负荷可由出现频率较大的小降雨事件输出。表明研究结果提供了一种思路,即可采用平均负荷方式取代过去的平均浓度方式去构建公路和栈道的负荷模型。展开更多
文摘The knowledge of space and time distribution of short duration rainfall depths is of primary interest in hydrotechnical studies and in extreme floods modelling. This work is carried out to establish a ＂DDF （Depth-Duration-Frequency）＂ relationship for the region of Annaba （Northeast of Algeria） through the examples of Pont Bouchet （El Hadjar）, Ain Berda and Chafia-Dam rainfall gauges. The results of the frequency study of stochastically generated annual series （Pearson＇s distribution type III model） and the regression analysis （least square method） permitted to develop a master curve that well describes heavy rainfalls distribution in the Annaba region. This 2-parameter model is used to predict, with sufficient accuracy, the amount of rain that could be recorded over a shorter duration from daily rainfall data in basins that lack recording rain gauges.
文摘对九寨沟国家公园中的公路和游客栈道进行了人工降雨试验的设计、操作和测试数据分析。模拟试验选择6处公路和栈道试验区,采用人工降雨方法模拟雨量出现概率60%、历时30 m in的降雨。试验按3 m in间隔对各试验场降雨径流带出的总磷负荷进行现场监测。研究结果提供了在具有代表性的降雨条件对总磷营养物输出的定量估计。尤其对公路和栈道降雨径流特征获得了认识:污染物初始冲刷浓度期延续约3 m in;在降雨强度不变的情况下,污染物负荷率接近常量。大部分污染物负荷可由出现频率较大的小降雨事件输出。表明研究结果提供了一种思路,即可采用平均负荷方式取代过去的平均浓度方式去构建公路和栈道的负荷模型。
