hydrology Articles
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Hydrologic signature analysis of select organic hydric soil indicators in northeastern Florida
The magnitude, duration, and return intervals of surface water flooding and dewatering of the landward extent of the hydric soil indicators muck (LM), histic epipedon (LHE), and Histosol (LH) were quantitatively defined, providing a better understanding of the hydrologic conditions maintaining these hydric soil indicators. Land surface elevations were determined for the LM, LHE, and LH at 16 ...
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Spatio-temporal variability of streamflow in the Huaihe River Basin, China: climate variability or human activities?
The water shortage in the Huaihe River Basin (HRB), China, has been aggravated by population growth and climate change. To identify the characteristics of streamflow change and assess the impact of climate variability and human activities on hydrological processes, approximately 50 years of natural and observed streamflow data from 20 hydrological stations were examined. The Mann–Kendall test ...
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Integration of an analytic element model in a stochastic analysis of infiltration into a complex unconfined aquifer system
ABSTRACT A hydrologic model based on the Analytic Elements Method (AEM) has been developed for a phreatic aquifer in the General Separations Area (GSA), of the Savannah River Site (SRS), South Carolina, USA. The AEM is a semi-analytical method that relies on the superposition of individual closed-form solutions of elements representing the main hydrologic features of a site. Our study adopts ...
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Evaluation of environmental flow requirements using eco-hydrologic–hydraulic methods in perennial rivers
The assessment of environmental flows in rivers is of vital importance for preserving riverine ecosystem processes. This paper addresses the evaluation of environmental flow requirements in three reaches along a typical perennial river (the Zab transboundary river, in north-west Iran), using different hydraulic, hydrological and ecological methods. The main objective of this study came from the ...
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Assessment of climate change impacts on the hydrology of the Lech Valley in northern Alps
The objective of this investigation is to assess the impacts of climate change on the hydrology of the Lech Valley (1,000 km2), a sub-catchment of the Danube River basin located in the northern Alps. An ensemble of nine climate projections is used to simulate the climate of a mid-21st-century scenario period (2040–2069) and an end-21st-century scenario period (2070–2099). The delta change ...
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Impact of the Three Gorges reservoir operation on downstream ecological water requirements
With population increase and economic growth, the flow regime of the Yangtze River has been altered to some extent by human activities, particularly dam construction. Dam-induced alterations in the flow regime of the Yangtze River will unavoidably influence water allocation among different water users and instream ecological water requirements may not be guaranteed during some months, ...
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Comparing impacts of parameter and spatial data uncertainty for a grid-based distributed watershed model
Parameter uncertainty in hydrologic modeling is commonly evaluated, but assessing the impact of spatial input data uncertainty in spatially descriptive ‘distributed’ models is not common. This study compares the significance of uncertainty in spatial input data and model parameters on the output uncertainty of a distributed hydrology and sediment transport model, HYdrology Simulation using ...
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Distribution-based scaling to improve usability of regional climate model projections for hydrological climate change impacts studies
As climate change could have considerable influence on hydrology and corresponding water management, appropriate climate change inputs should be used for assessing future impacts. Although the performance of regional climate models (RCMs) has improved over time, systematic model biases still constrain the direct use of RCM output for hydrological impact studies. To address this, a ...
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FRA: commercial case study
Yateley Leisure Provision of hydrological, hydraulic and flood risk services Hydro-Logic was appointed in 2007/08 to undertake a series of flood risk assessments for sites in Yateley that had previously been used for mineral extraction. The planned development included office, leisure complex and water sports on one of the adjacent lakes. Hydraulic modelling for the adjacent River Blackwater ...
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The role of conceptual hydrologic model calibration in climate change impact on water resources assessment
Assessment of climate change (CC) impact on hydrologic regime requires a calibrated rainfall-runoff model, defined by its structure and parameters. The parameter values depend, inter alia, on the calibration period. This paper investigates influence of the calibration period on parameter values, model efficiency and streamflow projections under CC. To this end, a conceptual HBV-light model of ...
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Identification of dominant sources of sea level pressure for precipitation forecasting over Wales
Downscaling methods are utilized to assess the effects of large scale atmospheric circulation on local hydrological variables such as precipitation and runoff. In this paper, a methodology of statistical downscaling using a support vector machine (SVM) approach is presented to simulate and predict the precipitation using general circulation model (GCM) data. Due to the complexity and issues ...
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A comparison between direct and indirect frameworks to evaluate impacts of climate change on streamflows: case study of Karkheh River basin in Iran
In this paper, two approaches to assess the impacts of climate change on streamflows have been used. In the first approach (direct), a statistical downscaling technique was utilized to predict future streamflows based on large-scale data of general circulation models (GCMs). In the second approach (indirect), GCM outputs were downscaled to produce local climate conditions which were then used ...
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Rainwater harvesting: environmentally beneficial for the UK?
Rainwater harvesting (RWH) feels right from a long-term sustainability perspective. Short-cutting the hydrological cycle seems to make logical sense from an environmental stance, and the technique is being driven into new buildings in the United Kingdom (UK) through building rating systems which are in turn pushed by government policy. However, little work has been done to assess its ...
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Downscaling technique uncertainty in assessing hydrological impact of climate change in the Upper Beles River Basin, Ethiopia
We investigate the uncertainty associated with downscaling techniques in climate impact studies, using the Upper Beles River Basin (Upper Blue Nile) in Ethiopia as an example. The main aim of the study is to estimate the two sources of uncertainty in downscaling models: (1) epistemic uncertainty and (2) stochastic uncertainty due to inherent variability. The first aim was achieved by driving a ...
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Assessing the impact of arid area urbanization on flash floods using GIS, remote sensing, and HEC-HMS rainfall–runoff modeling
This study uses an integrated approach, bringing together geographic information system (GIS), remote sensing, and rainfall–runoff modeling, to assess the urbanization impact on flash floods in arid areas. Runoff modeling was carried out as a function of the catchment characteristics and the maximum daily rainfall parameters. Land-use types were extracted from the supervised classification of ...
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Facing the challenge of extreme climate: the case of Metropolitan São Paulo
Climate variability has always posed important challenges to water resources planners and engineers. Recent hydrologic data from different parts of the world show that the use of traditional stationary series statistical methods to assess risk and uncertainty may not produce reliable estimates. In particular, the 2014–2015 drought in Metropolitan São Paulo that was followed by major flooding ...
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A case study of regional risk assessment of river restoration projects: Nakdong River Basin, South Korea
An integrated approach to risk assessment that can pose significant challenges to mitigation and adaptation at the local or regional levels in the context of climate change was developed. First, a conceptual framework for flood risk analysis was developed based on the hydrologic hazard and the socioeconomic vulnerability of a region. Second, weighting factors for each indicator were estimated ...
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Assessing the hydrological impacts of climate change in the headwater catchment of the Tarim River basin, China
Two statistical downscaling models were used to downscale regional climate change scenarios, on the basis of the outputs of three general circulation models (GCMs) and three emission scenarios. Driven by these climate change scenarios, a distributed macro-scale hydrological model (the Variable Infiltration Capacity (VIC) model) was applied to assess the impact of climate change on hydrological ...
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Communicating modeled information for adaptation decision making
The HighNoon project, which began in 2009, set out to assess the impact Himalayan glacier retreat and expected changes in the Indian summer monsoon on the distribution of water resources in Northern India. The project’s aim was “to recommend appropriate and efficient response strategies to enable adaptation to hydrological extreme events.” The project used information from ...
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Impact of uncertainties in discharge determination on the parameter estimation and performance of a hydrological model
Uncertainties in discharge determination may have serious consequences for hydrological modelling and resulting discharge predictions used for flood forecasting, climate change impact assessment and reservoir operation. The aim of this study is to quantify the effect of discharge errors on parameters and performance of a conceptual hydrological model for discharge prediction applied to two ...
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