共查询到15条相似文献,搜索用时 0 毫秒
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陈闻晨 《水资源与水工程学报》2010,21(3):111-114
数字高程模型(DEM)代替等高线地形图实现了区域地形表面的数字化表达,其应用十分广泛。水文分析是地学分析的一个重要部分,近年来DEM在水文分析中的应用已经成为研究的热点。本文的研究选区位于泾河流域,采用中国北方1:25万地形图数据为基础生成DEM数据,进行流域信息的提取,得出结论:可以根据汇流累积单元数的阈值来生成不同密度的河网,在利用DEM进行流域信息提取时,要根据研究区情况和研究的目的,选择合适的方式生成DEM数据,以求试验结果达到最佳,更好地为不同单位部门的水资源调度决策研究提供支持。 相似文献
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该文以北江水系黄京塘子流域为例,采用基于DEM的地形分析算法,推求出了反映流域水文特性的地貌参数,并在此基础上生成了数字流域。 相似文献
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阐述了山区型河流对水位计的特殊要求,并结合山区型河流的特性,对常见的水位计进行了多方面的分析比较,从而得出山区型河流水位计的选型。 相似文献
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A Model for the Optimal Allocation of Water Resources in a Saltwater Intrusion Area: A Case Study in Pearl River Delta in China 总被引:6,自引:1,他引:5
This paper presents a model for the optimal allocation of water resources in saltwater intrusion areas. The model is comprised
of four modules: a joint operation of river and reservoirs module (JORRM), a saltwater intrusion analysis module (SIAM), an
economic analysis and in-stream ecology demand module (EAIEDM) and a water allocation module (WAM). Considering the social,
economic and environmental aspects, the model has three objectives: the maximization of economic interest (OF
1), maximization of social satisfaction (OF
2) and the minimization of the amounts of polluted water (OF
3). A genetic algorithm is also employed to optimize the module. The model has then been applied to a case study of optimization
of water resources for the Pearl River Delta in China. The results indicate that there is water shortage in Pearl River Delta
and engineering projects are needed to satisfy water demand during the dry season when saltwater intrusion happens. The model
provides a useful tool for the operation of reservoirs and freshwater allocation in saltwater intrusion area. 相似文献
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针对引黄灌区测沙资料不能及时服务于管理工作的情况,为及时整编资料、合理分摊各县(市、区)清淤量,同时也为合理核算水价提供依据,开发研制了灌区测沙资料整编与分析模型。该模型由测沙资料整编、输沙率平差及泥沙淤积分析等3个功能模块组成。运行结果表明,本模型具有快速、方便、灵活等特点,能较好地满足水文规范及灌区管理工作的要求。 相似文献
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水库优化调度ANN模型隐层节点数经验公式比较 总被引:1,自引:0,他引:1
人工神经网络(ANN)应用于水库中长期调度时,隐层节点数尚无公认的选择标准.选取常用的4种确定隐层节点数的经验公式,采用合格率、确定性系数、平均绝对误差、指标综合占优数等指标,以全年、汛期、非汛期为统计时段,选取三峡、池潭、隔河岩等3个水库为对象,评价各经验公式对不同水库的普适性及可替代性.结果表明,各经验公式对不同水库、不同时段的应用效果存在一定差异,但对发电量最大为目标的模拟调度效果相差不大,可优先考虑使用隐层节点数最少的Lippmann公式建模. 相似文献
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A Model for Solving the Optimal Water Allocation Problem in River Basins with Network Flow Programming When Introducing Non-Linearities 总被引:2,自引:2,他引:0
The allocation of water resources between different users is a traditional problem in many river basins. The objective is to obtain the optimal resource distribution and the associated circulating flows through the system. Network flow programming is a common technique for solving this problem. This optimisation procedure has been used many times for developing applications for concrete water systems, as well as for developing complete decision support systems. As long as many aspects of a river basin are not purely linear, the study of non-linearities will also be of great importance in water resources systems optimisation. This paper presents a generalised model for solving the optimal allocation of water resources in schemes where the objectives are minimising the demand deficits, complying with the required flows in the river and storing water in reservoirs. Evaporation from reservoirs and returns from demands are considered, and an iterative methodology is followed to solve these two non-network constraints. The model was applied to the Duero River basin (Spain). Three different network flow algorithms (Out-of-Kilter, RELAX-IV and NETFLO) were used to solve the allocation problem. Certain convergence issues were detected during the iterative process. There is a need to relate the data from the studied systems with the convergence criterion to be able to find the convergence criterion which yields the best results possible without requiring a long calculation time. 相似文献
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为研究华北平原地区河道渗漏损失,以“引黄济津”跨流域调水实测数据为依据,利用两岸地下水位变幅资料分析,提出河道水量损失线性模型,为华北平原区域调水过程中的水资源配置、调度和优化提供科学理论依据。 相似文献
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王中华 《南水北调与水利科技(中英文)》2013,(4):31-34
沿水深对三维雷诺方程进行莱布尼兹积分得到二维非恒定流运动方程,据此建立滹沱河洪水演进数学模型。根据研究区边界条件及洪水标准,采用合适的水动力学方法,对河道行洪和实时洪水位进行了计算,并考虑了模型区内微地形的影响。在动边界处理时,采用数组跟踪的方法,提高了计算效率。利用滹沱河"96.8"洪水资料对模型进行了验证,模拟水位成果与实测资料吻合较好。在此基础上,模拟了不同标准行洪条件下,滹沱河行洪区内高尔夫球场建设前后的洪水形势,较好地反映了建设项目对河道行洪的影响。模拟结果表明该模型设计合理,具有一定可靠性和实用性。 相似文献