Extensive studies based on partition curve of gravity separation have been investigated. All created models are merely used to simulate density distribution at the same size fraction. However, they cannot be used to p...Extensive studies based on partition curve of gravity separation have been investigated. All created models are merely used to simulate density distribution at the same size fraction. However, they cannot be used to predictive distribution of materials depending on compound feature of density and size. According to this situation, an improved model of partition curve based on accumulation normal distribution, which was distinguished from conventional model of accumulation normal distribution for partition curve, was proposed in this paper. It could simulate density distribution at different size fractions by using the density-size compound index and conflating the partition curves at different size fractions as one partition curve. The feasibility of three compound indexes, including mass index, settlement index and transformation index, were investigated. Specific forms of the improved model were also proposed. It is found that transformation index leads to the best fitting results, while the fitting error is only 1.75 according to the fitting partition curve.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
基金the financial support from the National Natural Science Foundation of China (No. 51221462)
文摘Extensive studies based on partition curve of gravity separation have been investigated. All created models are merely used to simulate density distribution at the same size fraction. However, they cannot be used to predictive distribution of materials depending on compound feature of density and size. According to this situation, an improved model of partition curve based on accumulation normal distribution, which was distinguished from conventional model of accumulation normal distribution for partition curve, was proposed in this paper. It could simulate density distribution at different size fractions by using the density-size compound index and conflating the partition curves at different size fractions as one partition curve. The feasibility of three compound indexes, including mass index, settlement index and transformation index, were investigated. Specific forms of the improved model were also proposed. It is found that transformation index leads to the best fitting results, while the fitting error is only 1.75 according to the fitting partition curve.
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。
