共查询到18条相似文献,搜索用时 140 毫秒
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城中村因管网杂乱,导致供水漏损控制难度大,而管网改造可行性及经济效益低,如何降低其管网漏损是供水企业关注的焦点。以营口市两个城中村供水压力调控项目为例,探讨局部压力管理措施在降低管网漏损中的应用。实际运行表明,局部压力管理措施可为漏损严重而对管网进行改造存在难度的供水区域提供解决方法。 相似文献
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城市供水漏损不仅关系到水资源的节约和有效利用,也直接关系到供水企业的经济效益。结合衡阳市供水管网系统实际情况,通过水量审计分析,掌握表观漏损、实际漏损及免费授权用水量等分布状况,提出了衡阳市供水管网自来水漏损控制策略,并在衡阳市供水管网漏损控制实践中加以应用,取得了明显的效益。 相似文献
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影响城市供水管网漏损的因素很多,通过层次分析法确定主要的漏损原因,在此基础上,应用多元线性回归模型对供水管道正式使用后初次漏损时间进行了预测,然后运用二次指数平滑模型对随后几年的漏损时间进行了预测,由此建立了完善的供水管网漏损时间预测模型。 相似文献
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供水管网漏损评定标准及其控制的关键技术 总被引:2,自引:1,他引:1
供水管网漏损率是影响城市水资源可持续利用的重要指标,国内外城市供水管理部门和供水企业对此均非常重视,开展了大量供水管网漏损评定标准及控制技术的研究。1供水管网漏损评定标准我国于2002年首次制定的供水管网漏损控制和管理的行业标准《城市供水管网漏损控制及评定标准》 相似文献
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针对供水管网泄漏辨识定位系统,研究了以管网压力、流量参数形成的时间序列数据为基础,应用支持向量机方法建立漏损辨识模型,采用粒子群算法对支持向量机中的c、g参数进行优化,最终通过压力梯度法实现漏点的准确定位。结果表明:所建立模型对管网漏损辨识定位的准确率较高,满足供水管网漏损监测的要求。 相似文献
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供水管网模型在区域计量分区管理中的应用 总被引:5,自引:0,他引:5
对供水管网实施区域计量分区(DMA)管理是城市管网管理的一种新模式,对提高供水系统的管理水平、提高供水效益、优化管网运行以及减小管网漏损等具有重要的意义.以JM市为例,应用供水管网模型模拟分析手段,科学划分区域规模和边界,对分区方案进行计算,验证其可行性,规避DMA引起的管网运行风险. 相似文献
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To evaluate non revenue water (NRW) and losses in water distribution networks a methodology is developed by applying “annual
water balance” and “minimum night flow” analyses. In this approach the main NRW components such as leakage from reported and
un-reported bursts and background leakage, with real or estimated data, enabling assessment of indices of leakage performance
are evaluated. Also, a novel procedure is introduced in this paper that can determine the nodal and pipe leakage by using
a hydraulic simulation model. Recognising the pressure dependency of leakage the total consumption is divided into two parts,
one pressure dependent and the other independent of local pressure, and the hydraulic behaviour of the network is analyzed.
A computer code is developed to evaluate all components of water losses based on the proposed methodology. For better representation
of the results and management of the system, the outputs are exported to a GIS model. Using the capabilities of this GIS model,
the network map and attribute data are linked and factors affecting network leakage are identified. In addition, the effects
of pressure reduction are investigated. The model is illustrated by a real case study. The results show that the suggested
model has overcome the shortcomings of the existing methodologies by accounting for the leakage and other NRW components in
water distribution networks more realistically. 相似文献
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Pressure management is one of the most significant water demand management methods to reduce leakage in water distribution networks. Leak as an adverse event is directly related to the pressure. Therefore, reducing extra network pressure decreases leakage in water distribution networks. The pressure reducing valves have some disadvantage. For example, they break down quickly. Therefore, in this study, a novel system named Pressure Reducing Flexible Storage (PRFS) was introduced that hasn’t these disadvantages and it could consider a good alternative for pressure reducing valves in water distribution networks. In this system, a spherical tank containing a flexible rubber cover was installed at the network node. By increasing the pressure in the conjunction, the foam was compressed and reduced the pressure. In this study, the presented system was simultaneously modeled by using Flow-3D and ABAQUS softwares, and pressure decrement was estimated in the conjunction. The results show that the proposed system can decrease the pressure in the conjunctions of water distribution network by about 18%. Therefore, it could be considered as a good alternative for pressure reducing valves in water distribution networks. 相似文献
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龙山水库渗漏问题及其解决方案 总被引:1,自引:0,他引:1
广东省龙山水库大坝为厚斜墙堆石坝,坝址位于NNE向两条压扭性大断层之间,构造断裂、节理裂隙发育,全风化、强风化层深厚。针对水库的几个重要渗漏点,对其不同的渗漏原因进行了分析,从而确定了帷幕灌浆、高压喷射注浆、复合土工膜等不同的解决方案。 相似文献
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