介绍了泥沙交换和河床粗化计算模拟的物理图案和长系列河床演变数学模型的研究方法。
The methods of simulating the physical patterns of sediment exchange and bed coarsening and establishing long series river-bed sediment accumulation mathematical model were also given.
筛选模型用以初定灌区的大致范围，长系列优调模型是在筛选的基础上确定符合灌溉保证率的灌区规模。
The screen model determines primary irrigation scale and, based on the primary scale, the long-run optimal operation model determines the irrigation scale that conforms to irrigation guarantee rate.
对长系列资料分析表明，黄河干流天然径流量多年变化有着明显的丰、枯循环周期变化，其周期长度并不稳定；
Through the analysis of the long series data, the variety of natural flow of the Yellow River has obviously plentiful and withered circulation period, the length of the period is unsteady;
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