hydrology analysis Articles
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A method for extracting drainage networks with heuristic information from digital elevation models
Depression filling and direction assignment over flat areas are critical issues in hydrologic analysis. This paper proposes a method to handle depressions and flat areas in one procedure. Being different from the traditional raster neighbourhoods processing with little heuristic information, the method is designed to compensate for the inadequate searching information of other methods. The ...
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FRA: Leisure case study
Woodland Environmental Spelthorne Equestrian Centre Hydro-Logic was appointed in 2007/08 to undertake a Flood Risk Assessment for a proposed Equestrian Centre in Shepperton near London. The site was a former landfill site that had been restored and was used for grazing. The proposals included soil importation and landscaping along with construction of stables and ancillary buildings. The ...
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Marine hydrogeology: recent accomplishments and future opportunities
Marine hydrogeology is a broad-ranging scientific discipline involving the exploration of fluid–rock interactions below the seafloor. Studies have been conducted at seafloor spreading centers, mid-plate locations, and in plate- and continental-margin environments. Although many seafloor locations are remote, there are aspects of marine systems that make them uniquely suited for hydrologic ...
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A new hydrological balance and water management issues in Zakynthos Island, Greece
The use of groundwater resources in Zakynthos Island in the Ionian Sea at central Mediterranean has become extremely intensive during the last decades, due to the high rate of urbanisation, tourist development and irrigated land expansion and is estimated being 15 hm 3 /year. Different methods are being required when water-related sustainability issues are examined like development analysis, ...
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Hydrologic sensitivity of the Upper San Joaquin River Watershed in California to climate change scenarios
To examine the hydrological system sensitivity of the southern Sierra Nevada Mountains of California to climate change scenarios (CCS), five headwater basins in the snow-dominated Upper San Joaquin River Watershed (USJRW) were selected for hydrologic simulations using the Hydrological Simulation Program-Fortran (HSPF) model. A pre-specified set of CCS as projected by the Intergovernmental Panel ...
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Do catchment characteristics explain differences in coherence and trends in hydroclimatic behaviour in an upland region?
To explore the link between catchment characteristics and sensitivity to environmental change, longer-term data from 21 contrasting mesoscale (67–690 km2) catchments in northern Scotland were analysed to examine the influence of hydroclimatic drivers on hydrological response. Cluster analysis was used to classify the catchments into four distinct groups, with topography and annual ...
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Braided rivers: structure, types and hydrological effects
Braided rivers have been intensively analyzed mostly by geomorphologists. In the present study the approach to recognize braided channel types and effects with the special emphasis on flow partitioning has been applied. It is assumed that each braided channel represents the reach which is initiated with dividing of the single channel and completed below the confluence of the total multiplicity ...
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Corporate social responsibility of regional institutions: save water and money with an ecological economics perspective in a climate change context
As ecological economic fundamentalists argue, we need a new paradigm for changing current global economic system basics. The real problem is that the limits of ecological economics are based on unrealistic or utopian objectives in the proposed research frameworks. Taking this problem into account, present research demonstrates that the combination of mixed methods creates valid results. In this ...
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Comparing the capability of distributed and lumped hydrologic models for analyzing the effects of land use change
Empirically based lumped hydrologic models have an extensive track record of use for various engineering applications. Physically based, multi-dimensional distributed models have also been in development and use for many years. Despite the availability of high resolution data, better computational resources and robust, numerical methods implemented in such models, their usage is still limited, ...
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Wavelet-based trend analysis of hydrological processes at different timescales
This study analyzes involved trends in stream flow and precipitation data at monthly, seasonal and annual timescales observed at six precipitation and four stream flow stations of Tampa Bay using non-parametric Mann–Kendall (MK) and discrete wavelet transform (DWT) methods. The MK test and sequential MK analysis were applied to different combinations of DWT after removing the effect of ...
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Assessment of catchment response and calibration of a hydrological model using high-frequency discharge–nitrate concentration data
This study uses a high-frequency discharge and nitrate concentration dataset from the Weida catchment in Germany for the catchment scale hydrologic response analysis. Nitrate transport in the catchment is mostly conservative as indicated by the nitrate stable isotope (δ15N and δ18O) analysis. Discharge–nitrate concentration data from the catchment show distinctive patterns, ...
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Assessment of emerging hydrological, water quality issues and policy discussion on water sharing of transboundary Kabul River
Transboundary water sharing policy between Pakistan and Afghanistan along with emerging issues over the Transboundary Kabul River have been discussed incorporating long-term hydrological trend analysis, water quality issues and temporal changes in land cover/land use. The annual (1977–2015) mean river flow of 26.32 billion (109) cubic metres (BCM) with a range of 13.77 to 42.2 BCM and ...
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Introduction of new datasets of drought indices based on multivariate methods in semi-arid regions
Drought is a slow and creeping worldwide phenomenon which has adversely affected arid and semi-arid regions of the world. Drought indices like Streamflow Drought Index (SDI) and Standardized Precipitation Index (SPI) offer quantitative methods for combating probable consequences of drought. In this article, the results of the drought indices trend showed that the case study suffers from ...
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Variability of annual peak flows in the Beijiang River Basin, South China, and possible underlying causes
Peak flows are the most important flood parameter which relatively reflects the highest level and potential destructive power of a flood. Understanding peak flow changes can effectively capture a flood characteristic and is essential for developing flood control strategies. This study aims to reveal how regional peak flows evolved in recent decades, mainly from a non-linear perspective. The ...
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Ecological function zoning of Poyang Lake wetland: a RAMSAR site in China
Ecological function zoning involves the spatial delineation of ecological functions based on the physical environment and ecosystem service functions, as well as the demands of eco-environmental protection and socio-economic development of the area according to the theory of ecological function regionalization. In this context, we defined the boundary of Poyang Lake wetland using geographic ...
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Modelling the hydrological impacts of rural land use change
The potential role of rural land use in mitigating flood risk and protecting water supplies continues to be of great interest to regulators and planners. The ability of hydrologists to quantify the impact of rural land use change on the water cycle is however limited and we are not able to provide consistently reliable evidence to support planning and policy decisions. This shortcoming stems ...
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Sensitivity analysis of hydrological models: review and way forward
Different hydrological models provide diverse perspectives of the system being modeled, and inevitably, are imperfect representations of reality. Irrespective of the choice of models, the major source of error in any hydrological modeling is the uncertainty in the determination of model parameters, owing to the mismatch between model complexity and available data. Sensitivity analysis (SA) ...
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Evolutionary product unit based neural networks for hydrological time series analysis
Artificial Neural Networks (ANNs) are now widely used in many areas of science, medicine, finance and engineering. Analysis and prediction of time series of hydrological/and meteorological data is one such application. Problems that still exist in the application of ANN's are the lack of transparency and the expertise needed for training. An evolutionary algorithm-based method to train a type of ...
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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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Improving the efficiency of Monte Carlo Bayesian calibration of hydrologic models via model pre-emption
Bayesian inference via Markov Chain Monte Carlo (MCMC) sampling and sequential Monte Carlo (SMC) sampling are popular methods for uncertainty analysis in hydrological modelling. However, application of these methodologies can incur significant computational costs. This study investigated using model pre-emption for improving the computational efficiency of MCMC and SMC samplers in the context ...
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