宁蒙段河道过流能力过低是威胁黄河上游洪凌安全的关键因素，也是宁蒙河段水沙调控的重要影响因素。通过水位-流量关系曲线法确定了过流能力，对现状过流能力与历史过流能力进行对比分析，探讨了造成宁蒙河段河道过流能力过低的原因。结果显示：宁蒙河段自建站以来有剧烈的河床抬高和过流能力下降现象；宁蒙河段各断面的现状过流能力由5 200~6 200m3·s-1降至1 500~2 200m3·s-1，部分断面超过1 500m3·s-1就会导致漫滩，过流能力大大降低。提出建设标准化堤防，提高宁蒙河段河道的过流能力；以标准化堤防为前提获得了宁蒙河段各断面的最大过流能力。
Low conveyance capacity of Ningxia-Inner Mongolia Reach is key factors which threatened the security of Flooding and Ice Run upper Yellow River, it also a bottleneck developing regulation and control of runoff and sediment of the Ningxia-Inner Mongolia Reach. Conveyance capacity of overcurrent is determined by the relationship curve between water level and flow in this paper, and the current conveyance capacity and historical conveyance capacity are analyzed comparatively, the causes of the overcurrent capacity of the Ningxia-Inner Mongolia Reach are discussed. The results show that:the reach has a dramatic phenomenon of riverbed elevation and over-current capacity decline since establishment of stations; the present conveyance capacity of the reach decreased from 5 200-6 200 m3·s-1 to 1 500-2 200 m3·s-1, some sections More than 1 500 m3·s-1 will lead to the floodplain, and reduce the conveyance capacity greatly; proposed the construction of standardization dike to improve the conveyance capacity; under the premise of the Yellow River dike standardization, access to the secure flow of traffic through, establishing foundation on developing runoff and sediment regulation and control of the Ningxia-Inner Mongolia Reach safely and successfully. Research has important practical significance to improve the Ningxia-Inner Mongolia Reach overcurrent condition and accelerate the Standardized construction process of the Yellow River each section of Ningxia-Inner Mongolia Reach dike.
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