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Ammar A. Ali Rebwar Hassan Anwer Hazim Dawood Nadhir Al‐Ansari Salahalddin S. Ali Sven Knutsson 《河流研究与利用》2020,36(3):351-361
Prudent management of Iraqi water resources under climate change conditions requires plans to be based on actual figures of the storage capacity of existing reservoirs. With the absence of sediment flushing measures, the actual storage capacity of Dokan Reservoir (operated since 1959) has been affected by the amount of sediment delivered during its operational life leading to an undetermined reduction in its storage capacity. In consequence, there has not been an update on the dam's operational storage capacity curves. In this research, new operational curves were established for the reservoir based on a recent bathymetric survey undertaken in 2014. The reduction in reservoir capacity during the period between 1959 and 2014 was calculated by the mean of the difference between the designed storage capacity and the storage capacity which was concluded from the 2014 bathymetric survey. Moreover, the rate of sediment transported to the reservoir was calculated based on the overall quantities of accumulated sediment and the water discharge of the Lesser Zab River into the reservoir. The results indicate that the dam capacity is reduced by 25% due to sedimentation of an estimated volume of 367 million cubic metres at water level 480 m.a.s.l. The annual sedimentation rate was about 6.6 million cubic metres, and the sediment yield was estimated to be 701.2 t?km?3?year. 相似文献
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曹强 《中国水能及电气化》2020,(4):18-21,17
巴家嘴水库为多泥沙河流水库,淤积问题较为突出。2019年实测兴利库容仅为2008年的20%,总库容约为2008年的67%,略大于2004年加固设计报告计算的2038年库容,淤积十分严重。文章在库容测量与泄流能力复核基础上,对大坝防洪能力进行了复核计算,提出了水库调度运用方式,以延长水库使用寿命。 相似文献
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根据小浪底水库2002~2015年的调水调沙资料,对泺口至利津河段的冲淤情况进行分析,认为调水调沙使泺口至利津河段的河道得到明显冲刷,主槽断面形态向良性发展,平滩流量大幅增加,过流能力大大增加。同时近几年调水调沙资料表明河道冲刷力度减弱,冲刷效率降低,河床粗化,主槽过流能力已基本稳定。 相似文献
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罗肇森 《水利水运工程学报》1995,(2)
根据伶仃洋的潮流、含沙量及水下地形的变化特点,对黄埔出海航道在伶仃洋的选线方案作了分析计算。选用泥沙回淤计算公式预报了各航道开挖后的回淤量。用伶仃西航道和蛇口五湾航道开挖后的实测结果进行淤积验证,计算值与实测值符合较好。伶仃东航道泥沙的回淤量少于伶仃西航道;铜鼓东航道也少于铜鼓西航道。无论开发伶仃东航道或是在伶仃西航道原来的基础上加深,均为可行。 相似文献
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西丽水库泥沙问题及对策分析 总被引:1,自引:0,他引:1
西丽水库是深圳市最重要的供水水库之一,随着周边区域开发的加剧,泥沙淤积和底泥对水质的影响已不容忽视。阐述西丽水库目前的泥沙淤积情况及底泥污染状况,并分析探讨应采取的对策。 相似文献
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潍坊港扩建工程方案泥沙淤积研究 总被引:1,自引:0,他引:1
利用现场实测资料及现有的研究成果,对潍坊港扩建工程的方案、港口泥沙淤积、河口演变、港址选择和挡沙堤长度等问题进行分析论证,首次提出平衡水深的概念,并用以预报不同方案的港池和航道淤积量,最后推荐港口扩建工程的最佳方案。 相似文献
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涌潮条件下排桩式低丁坝水力学冲淤试验研究 总被引:4,自引:2,他引:4
本文在水槽中用动床模型试验手段研究了涌潮条件下不同透水率的排桩式护塘低丁坝群的水力学冲淤特性,并探讨了低丁坝的护滩保塘机理,结果表明,不透水的排桩式丁坝群,其坝田部位可减冲1-1.6m,与相应方案的堆石坝研究结果相近;随着板桩丁坝透水率的逐渐增大,滩地防冲作用逐渐变小,然而透水率大于60%的丁坝,仍有0.8m以上的减冲能力,低丁坝的保滩护塘机理主要体现在三个方面;即对涌潮潮头的阻挡作用,对涌潮快水的减冲作用和在落潮期回流淤积作用。 相似文献
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黄河艾山以下河道引水引沙与河道冲淤关系的分析 总被引:2,自引:0,他引:2
本文通过实测资料分析,研究引水沙与河道冲淤的关系,明确引水引沙对河道的影响提出合理的引水引沙方案,并研究利用引水引沙减少艾山以下河道淤积措施的可能性。 相似文献
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目前,码头淤积和减淤措施的分析计算中,很少考虑船舶停靠的影响。针对金塘水道某码头,建立二维潮流泥沙模型,数值计算得到的潮流、含沙量结果与实测结果吻合。进而分析船舶停靠对潮流水动力和码头冲淤变化的影响。计算结果表明:船舶停靠阻碍了潮流运动,导致流速减小和泥沙淤积,但影响仅为周边区域。在考虑船舶停靠频率不变的前提下,针对目前1#,2#泊位最大月淤积强度接近实测淤积量(>1.15 m)这一情况,提出了3种减淤方案,并计算了实施方案1后的潮流和冲淤变化,发现导堤长度对减淤效果影响很大。对于重淤区而言,基于综合分析比较,短堤的防淤减淤效果较好,故推荐采用短堤方案。 相似文献
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Ali A. Obeed Al-Azawi 《国际水资源开发杂志》2017,33(4):628-648
An important challenge facing the design of sustainable aquifer management plans is weak primary data on aquifer recharge and use patterns. Weak data limit the ability of policy makers to design efficient aquifer protection plans. The objectives of this article are (1) to estimate groundwater use patterns for an important food-producing region of southern Iraq, the Bahr Al-Najaf Basin; (2) to compare groundwater use patterns with the renewable groundwater supply; and (3) to describe a sustainable groundwater policy alternative to current use patterns. For this study, original data on groundwater pumping were secured for 2006–2011. The data show a pattern of unsustainable groundwater withdrawals. A policy intervention is described in which pumping permits could be assigned to groundwater users to promote sustainable use. Allowing or encouraging the permits to be transferable through trading to higher-valued uses could reduce the economic costs of protecting the aquifer while promoting its sustainable use. 相似文献
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为准确掌握水库库容淤积及分布情况,以佛子岭水库为例,利用GIS对不同时期的库区地形图进行数字化建模,计算水库的库容和淤积量,并通过数字模型叠加计算制作水库库容淤积分布DEM图。结果表明:库容淤积DEM图直观地反映库区地形淤积厚度和分布情况,佛子岭水库库区淤积主要发生在死库容区域,纵向形态为带状淤积,没有明显的凸起和锥状淤积现象,横向呈现沿湿周的均匀淤积。准确掌握水库库容及淤积变化情况,为水库运行规范化管理、防洪调度提供重要技术支撑。 相似文献
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The Dinh An Estuary is one of the Nine Dragon estuaries of the Mekong River. An international navigation channel was built in the estuary for vessels traveling from the South China Sea to the southwestern area of Vietnam and then to Phnom Penh, Cambodia. The morphological evolution of the navigation channel is complicated and unstable. The back siltation intensity in the navigation channel has largely increased and been concentrated in the curvature segments of the channel since 1980. In this study, based on simulation results and measured data, five key factors that influence the back siltation in the navigation channel were systematically analyzed. These factors included the increasing elevation gap between the channel and the nearby seabed, the disadvantageous hydrodynamic conditions, sediment transport, mixing of saltwater and freshwater, and wave effects in the navigation channel. It is shown that the back siltation to a large extent results from the low current velocity of the secondary ocean circulation, which often occurs in the curvature segments of the channel. Suspended sediment also settles in the channel due to the decrease of the current velocity and the sediment transport capacity when flow passes through the channel. The changes of hydrodynamic conditions are responsible for the majority of the severe siltation in the curvature segments of the navigation channel. 相似文献
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刘淼 《水利与建筑工程学报》2009,7(3):149-151
2003年8月~10月降水所形成的渍涝盐碱灾害,再次告诫人们,对于交口抽渭这个地势低平,排水不畅,地下水位埋深较浅,地下水矿化度高的灌区,兴建完善的排水系统十分必要。而加强管理养护,确保其通畅运行则是发挥排水工程效益的关键环节。作者经过大量调查分析认为,在造成灌区排水干支沟淤积诸多原因中,排水工程重视不够,管理经费不落实,管护组织不健全是主要原因,并有针对性提出几点防治措施。 相似文献