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通过对北洛河中游峡谷河段的深入调查研究,在白水县张家船村段河谷台地的全新世黄土古土壤剖面中发现了古洪水滞流沉积夹层。采集了古洪水滞流沉积物典型样品,利用第四纪地质学和沉积学方法,通过磁化率、粒度、烧失量、碳酸钙含量等分析,发现其为中全新世后期(4 500～4 000a BP)特大洪水的典型悬移质沉积物。利用比降法模型计算得出,该组古洪水滞流沉积所指示的洪峰流量在13800～15600 m3/s之间;同时对该断面上游方向150m处的铁路桥1994年9月洪水洪痕进行了测量计算,其结果与水文站实测流量一致,证明古洪水水文学计算方法及相关参数的选取是合理的。该研究成果对北洛河的防洪减灾、交通和水利工程建设具有重要的参考价值。
Through the deep investigation and research on the canyon section of the middle reaches of the North Luohe River, the paleo-flood stagnant sedimentary dissection was found in the paleosol section of the Holocene in the valley platform of the Zhangjiachuan section of Baishui County. Based on the analysis of the magnetic susceptibility, grain size, loss on ignition and calcium carbonate content, the typical samples of sediment from the ancient flooding sediments were collected. Based on the Quaternary geology and sedimentology, 000a BP) typical suspended sediment in floods. Calculated using the method of ratio-reduction method, the peak flow rate indicated by the stagnant sediments of the ancient floods ranged from 13,800 to 15,600 m3 / s; meanwhile, flood sepsies of railway bridges at the distance of 150m in the upstream of the section from September 1994 The measurement and calculation, the results consistent with the hydrological station measured flow, proof of ancient flood hydrological calculation method and the selection of relevant parameters is reasonable. The research results have important reference value for the flood control and disaster reduction, traffic and water conservancy project construction of Beiluohe River.