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1.
紫色土丘陵区小流域泥沙输移的分形特征及输移比模型 总被引:3,自引:0,他引:3
综合分析了紫色土区小流域泥沙输移的特征。根据研究区库塘淤积资料及单元小流域地面侵蚀模数,计算了不同集雨面积小流域的泥沙输移比。应用分形理论的自相似原理,探讨了泥沙输移比与小流域集雨面积的关系,并得出泥沙输移比(SDR)的统计模型,可用于估算紫色土丘陵区资料短缺小流域的输移比和产沙量。 相似文献
2.
Runoff and Sediment Yield Modelling for a Treated Hilly Watershed in Eastern Himalaya Using the Water Erosion Prediction Project Model 总被引:3,自引:2,他引:1
R. K. Singh R. K. Panda K. K. Satapathy S. V. Ngachan 《Water Resources Management》2012,26(3):643-665
The Water Erosion Prediction Project (WEPP) watershed model was calibrated and validated for a hilly watershed treated with
graded bunding and water-harvesting tank in high rainfall condition of eastern Himalayan range in India. The performance of
the model for the treated watershed was unacceptable with percent deviation of −45.81 and −38.35 respectively for runoff and
sediment yield simulations when calibrated parameter values for the nearby untreated watershed were used. This was possibly
due to differences in soil properties and average land slope. When soil parameters were calibrated for the treated watershed,
the model performance improved remarkably. During calibration, the model simulated surface runoff and sediment yield with
percent deviations equal to +6.24 and +9.02, and Nash–Sutcliffe simulation coefficients equal to 0.85 and 0.81, respectively.
During validation period, the model simulated runoff and sediment yield with percent deviations equal to +8.56 and +9.36,
and Nash–Sutcliffe simulation coefficients equal to 0.81 and 0.80, respectively. The model tended to slightly under-predict
runoff and sediment yield of higher magnitudes. The model performance was quite sensitive to soil parameters namely, rill
erodibility, interrill erodibility, hydraulic conductivity, critical shear stress and Manning’s roughness coefficient with
varying levels. The WEPP model picked up the hydrology associated with bund and water-harvesting tank, and simulated runoff
and sediment yield well with overall deviations within ±10% and Nash–Sutcliffe simulation coefficients >0.80. Simulation results
indicate that in high slope and high rainfall conditions of eastern Himalayan region of India where vegetative measures are
not adequate to restrict soil loss within the permissible limit, the WEPP model can be applied to formulate structure-based
management strategies to control soil loss and to develop water resources. 相似文献
3.
小流域产流产沙动力学模型 总被引:15,自引:1,他引:15
按自然水系划分单元,每一单元又被概化为“一本打开的书”概化后的单元又区分为几个微地貌区。各单元水沙过程演算至流域出口迭加得流域产流产沙过程。此法一方面解决了降雨,侵蚀和下垫面的不均匀性,另一方面又解决了水沙的演算问题。坡面和沟道水流用运动波方程描述并用四点隐式差分格式求其数值解。根据水流作功和能量平衡原理推导出各微地貌区上的土侵蚀量计算公式,建立起具有物理过程基础的小流域产流产沙模型。 相似文献
4.
A Simple Conceptual Model of Sediment Yield 总被引:2,自引:0,他引:2
Pradeep Kumar Bhunya S. K. Jain P. K. Singh S. K. Mishra 《Water Resources Management》2010,24(8):1697-1716
The sediment graphs (time distribution of sediment yield) are very essential if the sediment transports the pollutants that
are toxic at high concentrations, requiring determination of peak, rather than average sediment flow rate. In this paper,
an effort has been made to develop a simple conceptual model of sediment yield based on Soil Conservation Service Curve Number
(SCS-CN) method, instantaneous unit sediment graph (IUSG) method, and Power law and the performance is tested using real field
data of Chaukhutia watershed of Ramganga river catchment (area = 452.25 km2). The proposed model is found to provide realistic estimates of temporal variation of sediment yield as well as total sediment
yield during a storm event. The model is found to be most sensitive to parameter β followed by k,
\upalpha\upalpha, A, and ns. A comparison is made with the existing IUSG based models of Kumar and Rastogi (J Hydrol 95:155–163, 1987) and Raghuwanshi et al. (J Hydraul Eng ASCE 120(4):495–503, 1994) for developing sediment graphs. 相似文献
5.
A Model for Optimal Allocation of Water to Competing Demands 总被引:4,自引:3,他引:1
The present study develops a simple interactive integrated water allocation model (IWAM), which can assist the planners and
decision makers in optimal allocation of limited water from a storage reservoir to different user sectors, considering socio-economic,
environmental and technical aspects. IWAM comprises three modules—a reservoir operation module (ROM), an economic analysis
module (EAM) and a water allocation module (WAM). The model can optimize the water allocation with any of two different objectives
or two objectives together. The two individual objectives included in the model are the maximization of satisfaction and the
maximization of net economic benefit by the demand sectors. Weighting technique (WT) or simultaneous compromise constraint
(SICCON) technique is used to convert the multi-objective decision-making problem into a single objective function. The single
objective functions are optimized using linear programming. The model applicability is demonstrated for various cases with
a hypothetical example. 相似文献
6.
半湿润流域蓄满超渗空间组合模型研究 总被引:2,自引:0,他引:2
《人民黄河》2015,(10)
半湿润流域蓄满产流与超渗产流兼有,如何区分两种不同性质的产流过程一直是水文预报的难题。基于主导性水文过程的概念,结合遥感技术与地理信息技术,采用水文学界应用广泛的CN值和地形指数指标,划分蓄满产流主导区与超渗产流主导区,提出了蓄满超渗空间组合模型。以东湾流域为例,验证了蓄满产流模型、超渗产流模型及蓄满超渗空间组合模型的模拟效果。结果表明:单一产流模型参数失真,蓄满超渗空间组合模型参数接近实际;蓄满产流与超渗产流主导区划分越精确,参数越合乎实际;蓄满超渗空间组合模型精度较高,验证期结果稳定。 相似文献
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Barriers within streams can affect riverine species' ability to access habitats and may reduce their population viability. Connectivity metrics attempt to quantify the impacts of barriers; however, little is known about their functioning when applied to dendritic habitats such as watersheds. Several graph‐theoretic connectivity metrics were calculated on rivers originating in the Luquillo Mountains of Puerto Rico. These metrics were classified into two primary groups: metrics that count weighted paths through the stream network and metrics that predict the flow of organisms through a stream reach. Representative metrics from each of these categories were suggested to model the effects of dams and water intakes, respectively. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献
10.
M. Mohammad Rezapour Tabari Shiva Tavakoli Mohsen Mazak Mari 《Water Resources Management》2014,28(10):3019-3034
Canal section design with minimum cost, which can be considered as an objective function, involves minimization of total costs per unit length of the canal, including direct costs of per cubic meter earthworks and per meter canal lining and indirect costs of water losses through canal seepage and evaporation. Since the costs (both direct and indirect) are associated with the canal geometry and dimensions, it is possible to lower them by optimization of the mentioned objective function. For this purpose, some constraints were subjected and considered to solve the problem. Flow discharge, as the main constraint, was considered in addition to the minimum permissible velocity and Froude’s number, as subsidiary constraints. MATLAB programming software was used to demonstrate and run the optimization algorithm. The results finally were illustrated in forms of dimensionless graphs, which simplify the optimum design of canal dimensions with minimum cost per meter length. Comparing the results with other similar studies, however show the importance and role of earthworks and lining costs, as well as including the subsidiary constraints in the optimization process. 相似文献
11.
We demonstrate the use of a quantitative measure of the effectiveness of using climate model simulations of surface precipitation
and temperature for water resources applications involving extremes of watershed average precipitation and temperature, and
watershed discharge. This diagnostic measure is considered in association with the use of climate information to condition
ensemble seasonal predictions of watershed variables. Seven watersheds in the Korean peninsula constitute the application
sites. The climate model effectiveness is expressed by a utility index EP that measures the ability of the climate model simulations of an indicator variable (i.e., nodal precipitation or temperature)
to discriminate observed distributions of the highs and lows of a watershed target variable (i.e., mean areal precipitation
and temperature as well as outlet discharge). Monte Carlo simulations provide estimates of the significance of the Ep values. For apparently the first time, ten-member ensemble simulations of daily surface precipitation and temperature from
the Korean Meteorological Agency climate model are used to evaluate the climate-model utility index EP for a temporal interval of 10 days for each application watershed. The results show that, in spite of the high uncertainty
of climate simulations, there are several Korean watersheds that can benefit from the use of climate model simulations of
high temporal resolution for planning and management studies that involve precipitation, temperature and discharge. In particular,
seasonal ensemble prediction of watershed variables stands to gain from conditioning on high-temporal resolution climate forecasts. 相似文献
12.
Reservoir sedimentation is a severe problem because it leads to the loss of reservoir storage capacity. Therefore, the sustainable
management of water and sediment constitutes a critical measure in reservoir operation. In this research, a model of similarity-based
operation method of water and sediment which can improve the efficiency of reservoir operation strategies is presented. Two
parts comprise this method: a similarity-based forecasting model for the sediment process at the dam, and a new operation
mode of water and sediment based on the sediment process at the dam. The similarity-based forecasting model is built on the
total flow model of water and sediment, which requires less data. Using the similarity among flood cases, the parameters of
the model are calibrated by group, and are dynamically selected, an approach which enforces the suitability of parameters
and improves the forecasting accuracy. In terms of the sediment process at the dam, the proposed optimal operation model of
water and sediment improves the sediment-venting efficiency and saves the water resource. 相似文献
13.
皇甫川流域产流产沙数学模型及水沙变化原因分析 总被引:10,自引:0,他引:10
该模型是从泥沙运动力学的基本理论出发,结合水文学,气象,土壤学和地理地貌学的原理建立起来的。并着重解决了在大流域计算中的流域的地理,地貌的差异性和降雨在时空分布上的不均匀性问题。 相似文献
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Water Resources Management - Water supply systems in urban areas may become deficient due to increasing demand, which accompanies population growth but is further jeopardized by equipment aging and... 相似文献
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As recycling effluent from municipal sewage plants is technically a feasible way, this paper presents a mathematical model to analyze the extent to which effluent should be reclaimed for industrial use and examine the factor affecting reuse of reclaimed water. The resulting data shows that the low price of fresh water leads to reduced use of reclaimed water and impedes the investment of the effluent purification plant. A mandated regulation on the substitution rate of reclaimed water is suggested to impose on the industry. Theoretically, the optimal substitution rate as well as the water quality is determined by maximizing the total social welfare that results from the construction of conveyance channels and effluent purification plants. A case example is employed to derive the optimal substitution rate and water quality of reclaimed water. Through the numerical analysis, an effluent plant for treating 20,000 kl/day effluent with the substitution rate of 21.24 % is selected as the optimal solution. 相似文献
18.
介绍了多沙河流游荡性河段整治工程措施试验研究课题中浑水系统的研制过程。通过试验证明该套浑水系统具有水力搅拌、宽水槽、不落淤、经济合理等特点 ,该套浑水系统可推广应用到其它浑水模型试验中。 相似文献
19.
Water Resources Management - The increase in water demand due to industrial development and agricultural expansion and the need for ecosystem improvement call for the efficient, equitable and... 相似文献
20.
Dominic Jeremy Andy Aris Ahmad Zaharin Sulaiman Wan Nor Azmin 《Water Resources Management》2015,29(12):4519-4538
Water Resources Management - The catchments of the Klang and Ampang Rivers are two sub-catchments that drain into the main Klang River, Selangor, Malaysia. Due to the development and siltation... 相似文献