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“揭河底”是黄河干支流上伴随高含沙水流所发生的河床强烈冲刷现象。据实测资料统计、分析，龙门站较大洪水的洪峰和洪量多由吴堡以上来水为主组成，但以吴堡以下来水为主的高含沙洪水发生“揭河底”现象的机率更高。“揭河底”可使主槽产生冲刷，滩槽高差加大，从而增大了主槽过洪能力。本文从水文角度分析了“揭河底”洪水在龙潼河段的演进特性，并根据近几年的河道萎缩情况指出，该河段的河床边界条件已经满足，一旦来水来沙条件具备，便可能再次发生“揭河底”现象。
“Exposing the river bottom” is the Yellow River dry tributaries accompanied by high sediment flow occurred in the river bed strong erosion phenomenon. According to the statistics and analysis of the measured data, the flood peak and flooding of the larger floodgate at Longmen Station are mostly composed of water coming from above Wu Fort, but the probability of “exposing to the river” caused by the flood of high sediment mainly taking water below Wubao higher. “Exposing the river bottom” can make the main groove erosion, beach height difference increases, thus increasing the main tank flood capacity. This paper analyzes the evolution characteristics of the “Jiehedian” flood in the section of the Longtong River from the hydrological point of view and points out that the riverbed boundary conditions of the riverbed have been met according to the river channel atrophy in recent years. Once the water and sand conditions are available, It may happen again “exposing the river” phenomenon.