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You searched for: Journal Hydrological sciences journal Remove constraint Journal: Hydrological sciences journal Publication Year 2006 Remove constraint Publication Year: 2006 Source 2006 v.51 no.6 Remove constraint Source: 2006 v.51 no.6
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1. Ecohydrology and water resources management: a pilot study in Trinidad

Author:
SHRIVASTAVA, GYAN
Source:
Hydrological sciences journal 2006 v.51 no.6 pp. 1163-1176
ISSN:
0262-6667
Subject:
amphibians; biodiversity; birds; decision support systems; environmental degradation; environmental impact; financial economics; fish; mammals; rain; rain forests; reptiles; rivers; socioeconomics; stream flow; trade winds; water management; Trinidad and Tobago
Abstract:
... An area of rainforest in Trinidad (10°N, 61°W) is remarkably rich in biodiversity, and receives the highest amount of rainfall in the island due to its orography and the dominant northeast trade winds. However, a year-round transfer of water from its pristine rivers is likely in the future, with ecological consequences. The results of a pilot study are presented, based on a simple, and graphical, ...
DOI:
10.1623/hysj.51.6.1163

2. Generalized regression neural networks for evapotranspiration modelling

Author:
KIŞI, ÖZGÜR
Source:
Hydrological sciences journal 2006 v.51 no.6 pp. 1092-1105
ISSN:
0262-6667
Subject:
Food and Agriculture Organization; air temperature; empirical models; empirical research; equations; evapotranspiration; irrigation management; neural networks; relative humidity; solar radiation; statistics; wind speed; California
Abstract:
... The potential is investigated of the generalized regression neural networks (GRNN) technique in modelling of reference evapotranspiration (ET0) obtained using the FAO Penman-Monteith (PM) equation. Various combinations of daily climatic data, namely solar radiation, air temperature, relative humidity and wind speed, are used as inputs to the ANN so as to evaluate the degree of effect of each of th ...
DOI:
10.1623/hysj.51.6.1092

3. Horizontal rough fracture type curves for groundwater movement

Author:
ŞEN, ZEKAI
Source:
Hydrological sciences journal 2006 v.51 no.6 pp. 1125-1138
ISSN:
0262-6667
Subject:
differential equation; drawdown; groundwater; paper; roughness; turbulent flow
Abstract:
... Type curves are derived analytically for radial flow in rough horizontal fractures toward a well. The basic assumptions are that there is no turbulent flow near the borehole and the well storage is ignored. The basis of the methodology is to write explicit expressions for the continuity and cubic law flow equations, which are combined using a Boltzmann transformation leading to a simple ordinary d ...
DOI:
10.1623/hysj.51.6.1125

4. Hydrogeochemical evaluation of high-fluoride groundwaters: a case study from Mehsana District, Gujarat, India

Author:
DHIMAN, S. D.; KESHARI, ASHOK K.
Source:
Hydrological sciences journal 2006 v.51 no.6 pp. 1149-1162
ISSN:
0262-6667
Subject:
X-ray diffraction; alkalinity; calcite; calcium; calcium chloride; carbon dioxide; case studies; dolomite; factor analysis; fluorides; groundwater; humans; hydrogeochemistry; ion exchange; magnesium chloride; models; potassium bicarbonate; sodium; soil sampling; sulfate minerals; sulfates; water quality; India
Abstract:
... oundwater quality problems have emerged in many geographical areas due to natural environmental processes and human intervention in the geosystems. Hydrogeochemical appraisal of fluoride contaminated groundwater in Mehsana District, Gujarat State, India is carried out by means of groundwater quality investigations together with X-ray diffraction analysis of soil samples in the delineated high fluo ...
DOI:
10.1623/hysj.51.6.1149

5. Identification of aquifer parameters from residual drawdowns: an optimization approach

Author:
SING, SUSHIL K.
Source:
Hydrological sciences journal 2006 v.51 no.6 pp. 1139-1148
ISSN:
0262-6667
Subject:
aquifers; least squares; model validation; nonlinear models; system optimization; wells
Abstract:
... An optimization method based on nonlinear least squares is proposed for the identification of aquifer transmissivity and two storage coefficients, one for the pumping phase and the other for the recovery phase, using only residual drawdowns at an observation well. The method is applicable irrespective of whether pumping and recovery storage coefficients are the same or are different and the argume ...
DOI:
10.1623/hysj.51.6.1139

6. Infiltration in the Corgo River basin (northern Portugal): coupling water balances with rainfall—runoff regressions on a monthly basis

Author:
ALENCOÃO, ANA MARIA PIRES; PACHECO, FERNANDO ANTÓNIO LEAL
Source:
Hydrological sciences journal 2006 v.51 no.6 pp. 989-1005
ISSN:
0262-6667
Subject:
base flow; basins; environmental factors; equations; evapotranspiration; models; overland flow; rivers; rocks; runoff; surface water; temperate zones; water reservoirs; watersheds; Portugal
Abstract:
... A combination of water balances and rainfall—runoff regressions is used to calculate infiltration, overland flow, baseflow and change to the surface water reservoir, on a monthly basis; evapotranspiration from the underground reservoir, on an annual basis; and a lag phase of maximum infiltration and maximum baseflow within a hydrological year. The water balance equations are written for catchment ...
DOI:
10.1623/hysj.51.6.989

7. On the British contribution to international hydrology—an historical perspective

Author:
RODDA, JOHN C.
Source:
Hydrological sciences journal 2006 v.51 no.6 pp. 1177-1193
ISSN:
0262-6667
Subject:
groundwater; surface water; surveys
Abstract:
... This paper attempts to identify distinctive British inputs to the international hydrological sciences through a survey of the development of British hydrology from the start of quantitative hydrology to recent times. The focus is on contributions which have advanced knowledge through scientific research, mainly research on surface water and to a lesser extent on groundwater, but a number of other ...
DOI:
10.1623/hysj.51.6.1177

8. On the quest for chaotic attractors in hydrological processes

Author:
KOUTSOYIANNIS, DEMETRIS
Source:
Hydrological sciences journal 2006 v.51 no.6 pp. 1065-1091
ISSN:
0262-6667
Subject:
autocorrelation; hydrometeorology; rain; relative humidity; runoff; time series analysis
Abstract:
... n the last two decades, several researchers have claimed to have discovered low-dimensional determinism in hydrological processes, such as rainfall and runoff, using methods of chaotic analysis. However, such results have been criticized by others. In an attempt to offer additional insights into this discussion, it is shown here that, in some cases, merely the careful application of concepts of dy ...
DOI:
10.1623/hysj.51.6.1065

9. Rainfall and streamflow response to El Niño Southern Oscillation: a case study in a semiarid catchment, Australia

Author:
DUTTA, SUNIL C.; RITCHIE, JOHN W.; FREEBAIRN, DAVID M.; ABAWI, YAHYA
Source:
Hydrological sciences journal 2006 v.51 no.6 pp. 1006-1020
ISSN:
0262-6667
Subject:
El Nino; basins; case studies; climatic factors; decision making; frequency distribution; irrigation; natural resource management; probability; probability distribution; rain; rivers; stream flow; watersheds; weather forecasting; Australia
Abstract:
... is paper aims to compare the shift in frequency distribution and skill of seasonal climate forecasting of both streamflow and rainfall in eastern Australia based on the Southern Oscillation Index (SOI) Phase system. Recent advances in seasonal forecasting of climate variables have highlighted opportunities for improving decision making in natural resources management. Forecasting of rainfall proba ...
DOI:
10.1623/hysj.51.6.1006

10. Regional analysis of low flow using L-moments for Dongjiang basin, South China

Author:
CHEN, YONGQIN DAVID; HUANG, GUORU; SHAO, QUANXI; XU, CHONG-YU
Source:
Hydrological sciences journal 2006 v.51 no.6 pp. 1051-1064
ISSN:
0262-6667
Subject:
basins; cities; economic development; lognormal distribution; planning; population growth; regression analysis; river deltas; rivers; water supply; watersheds; China
Abstract:
... Dongjiang water has been the key source of water supplies for Hong Kong and its neighbouring cities in the Pearl River Delta in South China since the mid-1960s. Rapid economic development and population growth in this region have caused serious concerns over the adequacy of the quantity and quality of water withdrawn from the Dongjiang River in the future. Information on the magnitude and frequenc ...
DOI:
10.1623/hysj.51.6.1051

11. Regional runoff prediction through aggregation of first-order hydrological process knowledge: a case study

Author:
VAN DEN BOS, RUDI; HOFFMANN, LUCIEN; JUILLERET, JÉRÔME; MATGEN, PATRICK; PFISTER, LAURENT
Source:
Hydrological sciences journal 2006 v.51 no.6 pp. 1021-1038
ISSN:
0262-6667
Subject:
basins; case studies; hydrologic models; prediction; runoff; watersheds; Luxembourg
Abstract:
... The dominant processes concept was used to develop a regionally applicable rainfall—runoff model. The first-order runoff processes are identified through a combination of field investigations, physico-geographical analysis of the research area, the Alzette River basin in the Grand-Duchy of Luxembourg, and discharge data series analysis. Lithology appeared to be the major source of discrepancy in h ...
DOI:
10.1623/hysj.51.6.1021

12. Soil moisture dynamics in coastal savanna soils in the tropics under different soil management practices

Author:
AMPOFO, E. A.
Source:
Hydrological sciences journal 2006 v.51 no.6 pp. 1194-1202
ISSN:
0262-6667
Subject:
coasts; dry season; farms; grasses; mulching; rain; rooting; sand fraction; savanna soils; savannas; soil compaction; soil water; tractors; tropics; weeds; wet season; Ghana
Abstract:
... Soil moisture is important for crop cultivation and its adequacy to meet crop-water requirements is determined by the degree of soil management practised and the quantity of water applied to the soil. This study investigates soil moisture dynamics on three plots: Bare (clean, weeds removed), Weedy (kept weedy), and Mulched (cleared of weeds and fully covered with grass mulch) during rainy and dry ...
DOI:
10.1623/hysj.51.6.1194

13. Trends in high flows in the central Spanish Pyrenees: response to climatic factors or to land-use change?

Author:
López-Moreno, J. I.; BEGUERÍA, S.; GARCÍA-RUIZ, J. M.
Source:
Hydrological sciences journal 2006 v.51 no.6 pp. 1039-1050
ISSN:
0262-6667
Subject:
abandoned land; climatic factors; frequency distribution; land use change; rain; reforestation; runoff; vegetation cover
Abstract:
... This paper analyses the evolution of high flows in the central Spanish Pyrenees during the period 1955–1995. The method applied makes it possible to assess whether the contribution of the largest daily discharge and rainfall events to the total annual runoff and precipitation remains stationary or shows any temporal trend. The results show a general negative trend in flood intensity in the last de ...
DOI:
10.1623/hysj.51.6.1039

14. Unified macroscopic model for unsaturated water flow in soils of bimodal porosity

Author:
SZYMKIEWICZ, ADAM; LEWANDOWSKA, JOLANTA
Source:
Hydrological sciences journal 2006 v.51 no.6 pp. 1106-1124
ISSN:
0262-6667
Subject:
diffusivity; homogenization; macropores; models; porosity; porous media; unsaturated flow
Abstract:
... Natural soils very often contain micro- and macropores, having different hydraulic properties. At the macroscopic scale, the unsaturated flow in such soils can be described with various models, depending on the hydraulic diffusivity ratio of the components and the connectivity of the most conductive component. Three macroscopic models recently derived by the homogenization method are discussed. Th ...
DOI:
10.1623/hysj.51.6.1106