river flow Articles
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Multidecadal climate oscillations in rainfall and river flow extremes
Temporal clustering in rainfall and flow extremes Recent research has shown that rainfall extremes exhibit temporal clustering at multi-decadal time scales, most probably as a result of persistence in large scale atmospheric circulation over such time scales. Continue reading the full ...
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Report of the Rosenberg International Forum Workshop on Transboundary Relations in the Mackenzie River Basin
The Mackenzie River is the largest north-flowing river in North America. It is the longest river in Canada and it drains a watershed that occupies nearly 20 per cent of the country. The river is big and complex. It is also jurisdictionally intricate with tributary rivers running through three provinces – British Columbia, Alberta and Saskatchewan – two territories – Yukon and ...
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A control model for the mouth of the River Murray, South Australia
The River Murray drains one-seventh of the Australian continent, but in 1991 the mouth closed for three months. The last 1000 km of the river system is controlled by weirs and barrages, and consequently it is feasible to use river flow to control the size of the river mouth. This paper demonstrates how recursive estimation techniques have been applied to the historical time series of monthly ...
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A hydrological assessment of the November 2009 floods in Cumbria, UK
In November 2009, record-breaking rainfall resulted in severe, damaging flooding in Cumbria, in the north-west of England. This paper presents an analysis of the river flows and lake levels experienced during the event. Comparison with previous maxima shows the exceptional nature of this event, with new maximum flows being established at 17 river flow gauging stations, particularly on ...
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Improving reliability of river flow forecasting using neural networks, wavelets and self-organising maps
Neural network (NN) models have gained much attention for river flow forecasting because of their ability to map complex non-linearities. However, the selection of appropriate length of training datasets is crucial and the uncertainty in predictions of the trained NNs with new datasets is a crucial problem. In this study, self-organising maps (SOM) are used to classify the datasets ...
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7. Lower Regge Project Implementation
In this chapter we address the last portion of the Regge river. The river now flows in large streamlined curves. While not clearly visible in the map or picture below, the municipal boundaries between Hellendoorn, Ommen and Twenterand actually twist around the river, revealing the old natural course of the river. Near Ommen the river flows as a tributary into the Vecht River. ...
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Implication of climate change and variability on stream flow in Iringa region, Tanzania
This paper investigates the implication of climate change and variability on the river flow within the traditional irrigation farming system, vinyungu, in Iringa region, Tanzania. The study aimed at establishing areas that are most impacted by climate change in terms of river flow and various adaptation strategies. It is based on both primary data collected by questionnaires distributed ...
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A large-scale hydroclimatological perspective on western European river flow regimes
A novel flow regime classification scheme was applied to 141 river basins across western Europe, providing more robust analysis of space–time variability in regimes and their driving hydroclimatological processes. Regime shape (timing) and magnitude (size) were classified to regionalise long-term average flow regimes and to quantify year-to-year variation in regimes for each basin. Six ...
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Environmental benefits of reclaimed water: an economic assessment in the context of the Water Framework Directive
The European Water Framework Directive (WFD) prescribes that all water bodies in Europe should achieve ‘good ecological status’ (GES). Maintaining a certain water flow is a pre-condition for the achievement of GES in areas of water scarcity. In such areas, reclaimed waste water is seen as a promising measure to keep river flow at a sufficient level. The contingent valuation method is applied here ...
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Understanding Flows Through the Remnant Colorado River Delta - Recommendations for Streamgage Sites and Data Collection - White Paper Calls for New Streamgages
Untitled Document Data needed on last reaches of Colorado River Installing new streamgages at specific points on the lower Colorado River would help efforts to restore emergent wetland and riparian habitats in the river delta. According to the Pacific Institute white paper 'Understanding Flows Through the Remnant Colorado River Delta: Recommendations for Streamgage Sites and Data ...
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Telejaen river, Romania case study
The area around the North of Bucharest is heavily industrialised with oil extraction and preparation facilities. Therefore the railway network is well developed in the region, since the oil needs to be transported from here across the country. Teleajen is a small tributary of the Prahova river, that flows east of Ploiesti and crosses the railway from Buzau to Ploiesti, which is part of the IX ...
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Trends and variability of climate and river flow in the region of Costa das Baleias, Brazil
There is an ongoing effort by the scientific community to regionalize climate studies to support local development plans. The area of interest is the Costa das Baleias on the east coast of northeast Brazil. It is located in a transition region of precipitation trends, and so assessing the local signal and magnitude is necessary. A series of annual anomalies of surface air temperature, ...
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Annual runoff change in the headstream of Yangtze River and its relation to precipitation and air temperature
We analyse the change trends of the annual and seasonal runoff series of the hydrological station Batang on the headstream of the Yangtze River over the period 1960–2007. The relations between runoff series and precipitation and temperature conditions are investigated, and the influence of the refreezing process of meltwater of the glaciers on the Yangtze River flow is examined with the ...
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The application cases of CL40Y USV flow measure yellow Yang river - Case study
Time:August ,2015 site: Huang Yang river,baijiao Hydrological station,Zhuhai City ,Guangdong Province Equipment:CL40Y Remote measuring unmanned ship,Sontek RiverSurveyor-M9 flow instrument Digest:huang yang river since the north SLATE cod croaker fish sand ,south to peak mountain even Jiti door channel,14 km long,is one of the main rivers flowing through zhuhai.,baijiao Hydrological station uses ...
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Stormwater input of pyrethroid insecticides to an urban river
The American River flows for nearly 50 km through highly urbanized lands surrounding Sacramento, California, USA. Twenty‐three streams, drainage canals, or pumping stations discharge urban runoff to the river, with the cumulative effect of nearly doubling the river's flow during rain events. During winter storms, the water column in the most downstream 13‐km reach of the river exhibited toxicity ...
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Daily river flow forecasting using wavelet ANN hybrid models
Advance time step stream flow forecasting is of paramount importance in controlling flood damage. During the past few decades, artificial neural network (ANN) techniques have been used extensively in stream flow forecasting and have proven to be a better technique than other forecasting methods such as multiple regression and general transfer function models. This study uses discrete wavelet ...
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Marginal benefit based optimal water allocation: case of Teesta River, Bangladesh
This article describes a hydrologic–economic optimization model for allocating available river flow between competing off- and in-stream demands, based on the marginal benefits (MBs) of sectoral water uses in a segment of the Teesta River in Bangladesh. Irrigation, capture fishery and navigation are the main direct water uses considered. The value of irrigation water was estimated using ...
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6. Middle Regge Project Implementation
Not only has the Regge been severely canalized in the past, a very large part of its catchment area in the eastern part of the Twente region has been disconnected from the system. A large part of this area, with relatively clean creeks, will now be reconnected by 2013 by the creation of new river that will flow into the Regge river a bit north of Enter in the Municipality ...
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Water Recycling Home Page
Recycled Water as a Valuable Resource In many parts of the World, freshwater supplies are limited. Rainfall and river flows are often seasonal and intermittent. Growing water needs are causing increased competition for available supplies. In some regions, the amount of water available is being reduced by global warming and climate change. Until recently, most of the water used for human ...
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Modelling stage–discharge relationship with single inflection point non–linear functions
The problem of using a non–linear function with only one inflection point for modelling hydrological phenomena is addressed. We present the examples of such functions and retain values of their parameters giving increasing function with one inflection point. For a set of data from one river, their least squares adjustments are compared for the stage–discharge relationship, namely the flow and the ...
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