共查询到20条相似文献,搜索用时 9 毫秒
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通过Mike11建立基于闸泵联控的水动力水质调控模型,设定水动力水质调控多目标函数并选取灰色多目标优选算法进行效果评选。以珠江三角洲中顺大围为例,用调控模型分析其在现状调度情况下的水动力水质特征,发现研究区的水动力及水质与相邻外江的水动力呈正相关,与相邻外江的距离呈负相关,河网水动力及水质整体较差。鉴于此,结合调度原则制定的5个闸泵联控方案均能较好地改善研究区的水动力水质条件,经过灰色多目标优选算法筛选出最优方案。提出基于闸泵联控的感潮河网区水动力水质调控模型能较好地展示不同闸泵联控方案下水动力水质改善的综合效果,可供类似感潮河网区水动力水质调控借鉴。 相似文献
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小浪底水库水沙调控对下游河道水质的影响 总被引:1,自引:0,他引:1
为了了解小浪底水库水沙调控过程对下游河道水质变化的影响,通过对黄河下游河道断面进行采样,分析了水沙调控前、中、后3个时期下游河道水体的水质及氮磷因子变化趋势,并对其营养状况作相应评价。结果表明:水沙调控后水体中电导率、TDS明显低于调控前;水沙调控过程中艾山、泺口、利津的叶绿素含量无明显变化;水体中硅酸盐含量变化规律为水沙调控前水沙调控中水沙调控后;水沙调控后TN、PO_4-P浓度明显高于调控前、中期,水沙调控前、中期TP浓度变化幅度不大。水沙调控3个时期中叶绿素与水温、DO、pH值均有显著的相关性;水沙调控前NO_3-N与TN、TP、NO_2-N在0.01水平上显著相关;水沙调控中PO_4-P与TP在0.01水平上显著正相关;水沙调控过程中水体TLI(∑)值均小于30,为贫营养状态,水沙调控前、后期为中营养状态。 相似文献
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Evaluating the impact of climate change at river basin level has become essential for proper management of the water resources. In the present study, Godavari River basin in India is taken as study area to project the monthly monsoon precipitation using statistical downscaling. The downscaling method used is a regression based downscaling termed as fuzzy clustering with multiple regression. Among the atmospheric variables simulated by global circulation/climate model (GCM) mean sea level pressure, specific humidity and 500 hPa geopotential height are used as predictors. 1o × 1o gridded rainfall data over Godavari river basin are collected from India Meteorological Department (IMD). A statistical relationship is established between the predictors and predictand (monsoon rainfall) to project the monsoon rainfall for the future using the Canadian Earth System Model (CanESM2) over IMD grid points under the Representative Concentration Pathways 2.6, 4.5 and 8.5 (RCP 2.6, 4.5, 8.5) scenarios of Fifth Coupled Model Inter-Comparison Project (CMIP 5). Downscaling procedure is applied to all 25 IMD grid points over the basin to find out the spatial distribution of monsoon rainfall for the future scenarios. For 2.6 and 4.5 scenarios results show an increasing trend. For scenario 8.5 rainfall showed a mixed trend with rainfall decreasing in the first thirty years of prediction and then increasing gradually over the next sixty years. 相似文献
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Optimal Water Quality Management Considering Spatial and Temporal Variations in a Tidal River 总被引:1,自引:1,他引:0
There is an increasing need to establish wastewater treatment facilities for improving water quality of heavily polluted rivers in rapidly urbanizing areas. Optimization models are widely used to determine the pollutant removal levels at different pollution sources, with the aim of minimizing the wastewater treatment cost and satisfying certain water quality criteria. Water quality is usually evaluated in a prescribed space or time point. Thus it cannot reflect the overall status of a tidal river that has significant spatio-temporal variations. In this paper, new spatio-temporal water quality criteria, which consider the water quality violation against specified water quality standards during the whole simulation period of time for the entire river simulated, are proposed and then applied to optimization of a wastewater treatment system in Shenzhen, China. The results indicate that the optimization based on the proposed criteria facilitates an improved performance of wastewater treatment systems in terms of water quality along the whole river during a long time period, instead of just in a prescribed space or time point. Furthermore, use of the new criteria derives a better Pareto front of cost and water quality in terms of convergence and coverage compared with the conventional criteria and thus they are recommended as the water quality criteria to measure spatial and temporal variation in a tidal river for wastewater treatment system planning. 相似文献
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《黑龙江水利科技》2015,(6)
为定量分析不同气候变化情景模式对大凌河中游水土流失的影响,以大凌河中游大城子站以上集水区域作为研究流域,基于大城子站2000—2010年水文数据,运用分布式水文模型SWAT模型,定量模拟分析4种气候变化情景模式对大凌河水土流失的影响。研究结果表明:SWAT模型在大凌河中游水土流失具有较好的模拟精度,模型在参数率定期和验证期,模拟的水土流失相对误差15%,确定性系数达到0.6以上,模型可用来定量评价不同气候变化情景模式对大凌河中游水土流失的影响;在4种气候变化情景模式下,在降水量不发生变化前提下,气温升高4℃和减低4℃,流域水土流失相应减少20%和增加20.87%,在气温不发生变化的前提下,降水量减少15%和增加15%,流域水土流失相应减少31.30%和增加33.91%。 相似文献
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汾河水库及其上游干流水质趋势研究 总被引:2,自引:0,他引:2
本文以美国统计学家肯德尔提出的水质季节性肯德尔趋势分析方法为基础,结合山西省季节性河流的特点,改变了目前只进行了单一污染物浓度趋势分析的方法,采用7个函数的流量校正污染浓度的趋势分析方法,水质水量相结合对汾河水库及其上游干流河道的水质进行了综合趋势分析,指出了河流水质的变化趋势及引起变化的原因。 相似文献
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潭江干流水质时空变化规律分析 总被引:1,自引:1,他引:1
依据潭江干流2001~2010年的水质监测数据,应用季节性肯达尔检验方法和有机污染综合指数法对水质时空变化进行评价分析,结果表明:近10a来,潭江流域在社会经济迅速发展的同时,主要污染物的排放也得到了一定的遏制,除石咀河段水质显著下降外,其余河段水质状况同10a前相比并没有明显恶化.在空间上,上游河段水质较好,明显优于... 相似文献
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在利用水沙数学模型进行多沙河流水库水沙调节计算时,准确的预判相应的来水来沙条件和库型边界条件下入库含沙水流的输沙流态并确定相应的控制方程,是确保计算结果准确的关键.通过建立水库一维非饱和输沙数学模型,对相同库型条件和相同来水来沙条件时不同输沙流态时人库水流的泥沙冲於量进行计算,初步量化回答了不同输沙流态对多沙河流水库水... 相似文献
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依据1992~1998年的监测资料,分析枯水期那达勐调节水库对流沙河流量调节前后河流水质污染状况,对改善水环境方面提出对策,探讨如何保障生态用水及合理配置水资源、 相似文献
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