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黄河中游洪水传播时间的研究多侧重于统计洪水资料来获得龙门站洪水传播至潼关的时间,而忽略了洪水传播时间的沿程分布。以吴堡-潼关河段2010年地形资料为基础,采用一维水动力学模型分析了河段内洪水至潼关的时间及其与洪水量级的关系。分析发现,由于龙门-潼关河段的游荡型河道特点,吴堡-潼关区间的洪水传播时间沿程分布存在一个下包络线。若以潼关站洪水30h预见期作为实践需求,无定河以下的各主要支流都需要一定的洪水预见期。分析得到吴堡-龙门段及龙门-潼关段洪水传播时间与距潼关距离及洪水流量的关系式,可为潼关站洪水预报提供参考。
Research on flood propagation time in the middle reaches of the Yellow River mainly focuses on statistical flood data to obtain the time when floods at Longmen Station reach Tongguan, ignoring the distribution along the flood propagation time. Based on the topographic data of Wubao - Tongguan River in 2010, a one - dimensional hydrodynamic model was used to analyze the relationship between the flood time and the flood level in the river section. The analysis shows that due to the wandering characteristics of the Longmen-Tongguan reach, there is a lower envelope along the flood distribution along the Wubao-Tongguan interval. Taking the 30-h flood season at Tongguan Station as a practical requirement, all the major tributaries below Wuding River will require a certain flood forecast period. The relationship between flood propagation time and distance to Tongguan and flood discharge is obtained through analysis of the Wobong-Longmen section and the Longmen-Tongguan section, which can be used as a reference for flood forecast at Tongguan Station.