Hydrology Articles

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Estimating parameters of the variable infiltration capacity model using ant colony optimization

by IWA Publishing  (Jun. 10, 2016)

Because hydrological models are so important for addressing environmental problems, parameter calibration is a fundamental task for applying them. A broadly used method for obtaining model parameters for the past 20 years is the evolutionary algorithm. This approach can estimate a set of unknown model parameters by simulating the evolution ...

iSTREEM®: An approach for broad‐scale in‐stream exposure assessment of “down‐the‐drain” chemicals

by John Wiley & Sons, Ltd.  (May 7, 2016)

The iSTREEM® model (“in‐stream exposure model”), a web‐based model made freely available to the public by the American Cleaning Institute, provides a means to estimate concentrations of “down‐the‐drain” chemicals in effluent, receiving waters, and drinking water intakes across national and regional scales under mean annual and low flow ...

Lake water levels for calibration of the S-HYPE model

by IWA Publishing  (Mar. 2, 2016)

Lake water levels are easy to measure, and can be seen as a transformation of discharge. Water level measurements from 42 lakes in Sweden were analysed, and eight of these lakes were modelled using the Swedish S-HYPE model. The objective was to test if a hydrological model can be calibrated using water level data instead of discharge. A ...

A recipe for standards-based data sharing using open source software and low-cost electronics

by IWA Publishing  (Mar. 1, 2016)

Environmental data are critical to understanding environmental phenomena, yet their consistent collection and curation can be cost-prohibitive. This paper describes a recipe for the design, development, and deployment of a low-cost environmental data logging and transmission system for environmental sensors and its connection to an open source ...

Discharge sensitivity to snowmelt parameterization: a case study for Upper Beas basin in Himachal Pradesh, India

by IWA Publishing  (Feb. 19, 2016)

Snow- and glacier melt are important contributors to river discharge in high-elevated areas of the Himalayan region. Thus, it is important that the key processes controlling snow and glacier accumulation and melting, are well represented in hydrological models. In this study, the sensitivity of modelled discharge to different snowmelt ...

Groundwater flow and transport model of the Estonian Artesian Basin and its hydrological developments

by IWA Publishing  (Feb. 8, 2016)

The sophisticated research and management problems of the Estonian water environment are considered by means of holistic modelling. The model elaborated is based on the computer code Visual MODFLOW Classic. The model encompasses the entire Estonian Artesian Basin (EAB) and the border districts of Russia and Latvia. It involves all main ...

Simulating the impact of roads on hydrological responses: examples from Swedish terrain

by IWA Publishing  (Jan. 27, 2016)

In this study, the potential impacts of road topography on hydrologic responses at the watershed scale were simulated. The method considered used a geographic information system to identify road embankment locations and subsequently remove them from the baseline elevation data. Starting from both the ‘with’ and ‘without’ road elevation model, ...

Hybrid wavelet-support vector machine approach for modelling rainfall–runoff process

by IWA Publishing  (Jan. 25, 2016)

Because of the importance of water resources management, the need for accurate modeling of the rainfall–runoff process has rapidly grown in the past decades. Recently, the support vector machine (SVM) approach has been used by hydrologists for rainfall–runoff modeling and the other fields of hydrology. Similar to the other artificial ...

Comparison of autoregressive moving average and state space methods for monthly time series modelling of Labrador and South-East Quebec river flows

by IWA Publishing  (Dec. 29, 2015)

Time series data such as monthly stream flows can be modelled using time series methods and then used to simulate or forecast flows for short term planning. Two methods of time series modelling were reviewed and compared: the well-known auto regressive moving average (ARMA) method and the state-space time-series (SSTS) method. ARMA has been ...

Modeling future changes in the North-Estonian hydropower production by using SWAT

by IWA Publishing  (Dec. 28, 2015)

Climate change is altering temperature, precipitation, and other climatic parameters, affecting sectors dependent on water resources, e.g. energy production. The purpose of this study is to analyze the possible influences of climate change on hydropower potential in North Estonia. In Estonian run-of-river hydropower plants, energy comes mainly ...

A watershed water quality evaluation model using data mining as an alternative to physical watershed models

by IWA Publishing  (Dec. 23, 2015)

This paper presents a data mining (DM)-based approach to developing a watershed water quality evaluation model (water quality evaluation model based on data mining (WQEMD)) as an alternative to physical watershed models. Three DM techniques (i.e. model tree, artificial neural network, and radial basis function) were employed to develop a WQEMD ...

HydroUnits: supporting dimensional analysis in hydrologic computing systems using sensor-based standards

by IWA Publishing  (Dec. 4, 2015)

Unit representation in the Transducer Electronic Data Sheet (TEDS) specified in the IEEE 1451 standards is a binary sequence of 10 octets that encode the physical units as a product of the seven Système International base units, plus radian and steradian, each raised to a rational power in addition to an unsigned integer indicating the ...

Evaluation of the applicability of the SWAT model in an arid piedmont plain oasis

by IWA Publishing  (Dec. 4, 2015)

Hetao Oasis is located in a typical piedmont alluvial plain bounded by the Langshan Mountain Range in the north, desert in the west, and the Yellow River in the south. Agricultural activities within the oasis significantly impact the hydrological cycle and water quality in downstream locations. The research uses the Soil and Water Assessment ...

Extending HydroShare to enable hydrologic time series data as social media

by IWA Publishing  (Nov. 27, 2015)

The Consortium of Universities for the Advancement of Hydrologic Science Inc. (CUAHSI) hydrologic information system (HIS) is a widely used service oriented system for time series data management. While this system is intended to empower the hydrologic sciences community with better data storage and distribution, it lacks support for the kind ...

Seasonal and flow‐driven dynamics of particulate and dissolved mercury and methylmercury in a stream impacted by an industrial mercury source

by John Wiley & Sons, Ltd.  (Nov. 18, 2015)

Sediments and floodplain soils in the East Fork Poplar Creek (EFPC) watershed in Oak Ridge, TN, are contaminated with high levels of mercury (Hg) from an industrial source at the headwaters. While baseflow conditions have been monitored, concentrations of Hg and methylmercury (MeHg) during high‐flow storm events, when the stream is more ...

Reversing hydrology: quantifying the temporal aggregation effect of catchment rainfall estimation using sub-hourly data

by IWA Publishing  (Nov. 18, 2015)

Inferred rainfall sequences generated by a novel method of inverting a continuous time transfer function show a smoothed profile when compared to the observed rainfall, however, streamflow generated using the inferred catchment rainfall is almost identical to observed streamflow (Rt2 > 97%). This paper compares the effective rainfall ...

Simulating water flow in variably saturated soils: a comparison of a 3D model with approximation-based formulations

by IWA Publishing  (Nov. 13, 2015)

In hydrological models, variably saturated flow is often described using the Richards equation, either in a fully three-dimensional (3D) implementation or using a quasi-3D framework based on the 1D Richards equation for vertical flow and a flow-approximation for the other two dimensions. However, it is unclear in which configuration or under ...

A grid-based integrated surface–groundwater model (GISMOD)

by IWA Publishing  (Nov. 4, 2015)

A distributed hydrological model, the Grid-based Integrated Surface-groundwater MODel (GISMOD), was developed to simulate hydrological processes by considering water interaction among different soil layers. The model integrates six modules. Basic information on catchment, such as the flow direction and the drainage network, can be obtained ...

The eReefs data brokering layer for hydrological and environmental data

by IWA Publishing  (Oct. 28, 2015)

The environmental sciences are witnessing a data revolution as large amounts of data are being made available at an increasing rate. Many datasets are being published through operational monitoring programs, research activities and global earth observation virtual laboratories. An important aspect is the ability to query relevant metadata ...

Multi-objective calibration of the physically based, spatially distributed SHETRAN hydrological model

by IWA Publishing  (Oct. 23, 2015)

Physically based, spatially distributed hydrological models have mostly been calibrated manually; a few were calibrated automatically but without full consideration of conflicting multi-objectives. Here, we successfully applied the non-dominated sorting genetic algorithm II (NSGA-II) and its two variants, namely the reference point-based ...

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