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汾河中下游河段为平原蜿蜒型河流。地处黄土高原，洪水期含沙量高。多年来由于河道来水、来沙量的减少和河口段黄河顶托作用加剧，河床泥沙淤积严重。加上大量整治工程的修建，使河势发生了很大变化，造成洪水峰量、历时相应变化。以往资料表明：柴庄水文站洪峰在１０００ｍ３／ｓ左右时，约１５／小时即可达河津水文站。而“９３．８”洪水汾河柴庄水文站洪峰流量１１４０ｍ３／ｓ经６９小时才到达河津站，河津站洪峰流量减为３８０ｍ３／ｓ。本文通过对汾河干流多年来水文资料的分析，探讨河床演变的规律，初步预测河床演变的趋势，为今后的防汛工作提供依据，以制定相应的防洪对策。
Fenhe middle and lower reaches of the plains meandering river. Located in the Loess Plateau, high flood sediment concentration. Over the years due to river water, to reduce the amount of sediment and estuary Yellow River top-off role of exacerbation, serious riverbed sediment deposition. Coupled with the construction of a large number of renovation works, great changes have taken place in the river regime, resulting in peak floods, which lasted corresponding changes. Past data show that: Chai Zhuang hydrological station flood peak at about 1000m3 / s, about 15 / hour to Hejin hydrological station. The “93.8” Fenhe Chai Chong hydrological station flood peak flow 1140m3 / s 69 hours to reach the Hejin station, Hejin station peak discharge reduced to 380m3 / s. Based on the analysis of the hydrological data of the mainstream of Fenhe River for many years, this paper discusses the law of riverbed evolution, forecasts the trend of riverbed evolution and provides the basis for flood control in the future so as to formulate corresponding flood control measures.