渭河下游河道平滩流量大幅度减小, 给渭河下游的防洪排涝带来严重威胁。以渭河下游咸阳- 临潼河段为研 究对象, 采用一维恒定水沙动力学模型模拟计算河段在60 年内的冲淤变化, 并通过基于断面几何标准的WOL 方 法, 辅以过水断面范围及有效河宽的限制来估算断面平滩水位, 结合一维恒定水沙动力学模型, 估算渭河下游咸阳 - 潼关河段的平滩流量和平滩水位的变化, 以及断面平滩水位、河段平滩水位与水沙系数及淤积量的关系。结果表 明, 渭河下游河段淤积主要发生在临潼- 华县河段, 该河段的滩地淤积尤为严重, 同时, 河段平滩流量逐渐减小。分 析可知, 此外, 采用WOL 方法估算的平滩水位与断面或河段的主槽淤积量的相关性较好。

The decr easing of bankfull dischar ge in the lower r each of the Weihe Riv er can lead t o ser ious t hr eats to the floo d con2 tr ol. T he fluv ial pro cess in the Xianyang2Linto ng section o f the lower reach of the Weihe Riv er in 60 year s w as simulated by the one2dimensional steady w ater and sediment dynamics mo del. The metho d of WOL based on the cr oss2section g eometr ic standar d was ado pt ed to estimate the bankfull elev atio n in the low er reach of the Weihe River w ith the help of cr oss sect ion r ang e and limit of effectiv e riv er w idth. The var iatio ns of bankfull dischar ge and bankfull elev ation in the Xianyang2Lintong sectio n o f the low er reach o f t he Weihe Riv er wer e analy zed, and the r elationships betw een the bankfull elevations of the cr oss sectio n and riv2 er section and the sediment co efficient and sedimentation amo unt wer e studied. The results show ed that sediment ation occur s mainly in the Lintong2H uax ian sect ion, especially in the f loo dpla in, while t he bankfull dischar ge decreases in this section. Mor eo2 v er, bot h the bankfull elevat ions of the cro ss section and river section have g oo d co rr elation w ith the sedimentat ion amo unt in the main channel of both sections.

/ 十二五0 国家科技支撑计划课题( 2012BAB02B02) ; 国家自然科学基金青年基金( 51109198) ; 国家/ 9730 计划课题 ( 2011CB403305)