hydrologic cycle Articles
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Water-related climate risks
Future changes in the hydrological cycle may have important impacts on the society, e.g. with regard to flood risks, water availability and water quality. Although climate observations do not show consistent global trends in the hydrological cycle despite of the global warming in the past century, strong regional and seasonal changes are possible. Even if for some regions the mean hydrological ...
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Limnological changes in two shallow lakes from an urban reserve throughout a complete hydrological cycle: proposals for restoration and management
We analysed the fluctuations of the limnological variables and phytoplankton structure in two shallow lakes located in an urban ecological reserve from Buenos Aires city (Reserva Costanera Sur) during a complete hydrological cycle. The results of this investigation showed that the changes in the water level strongly affect the limnological variables and the structure of the phytoplankton ...
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Physicochemical parameters of natural waters
All freshwater bodies are interconnected to the oceans, the atmosphere, and aquifers via a complex hydrological cycle. Wetlands, icecaps and biopheric water also participate in the continuous conveyance of water on planet Earth. The Earth’s hydrological cycle is driven by evaporation and gravity on which ecosystems and human societies depend. Growing populations may put stresses on natural waters ...
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New EPA Injection Well Study Points to Keeping the Injected Wastewater in the Hydrologic Cycle
Billions of gallons of water are removed each year from the hydrologic cycle and injected into underground formations thousands of feet below the surface of the earth. Hydrologists agree that there is approximately less than 1% usable water for humans on our planet. With proven enhanced evaporation methods, why continue sending this precious resource underground out of the hydrology cycle? ...
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The Biotic Pump: Condensation, atmospheric dynamics and climate
Intense condensation associated with high evaporation from natural forest cover maintains regions of low atmospheric pressure on land. This causes moist air to flow from ocean to land, which compensates the river runoff. Deforestation induces large-scale desiccation by disrupting this flow. Here we overview this theory and quantify the horizontal pressure gradients that govern the continental ...
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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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Climate change and water resources in the Lower Mekong River Basin: putting adaptation into the context
Adaptation to climate change has become one of the focal points of current development discussion. This article summarises the findings from a multidisciplinary research project looking at climate change impacts and adaptation in the Mekong River Basin in Southeast Asia. The research highlights the central role that the hydrological cycle has in mediating climate change impacts on ecosystems and ...
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Desertification and climate change: Saudi Arabian case
This paper concentrates on the possible relationships between the climate change and desertification in arid regions. It is stated that the global warming will cause vertical expansion of air volumes over the three free water surfaces (Red Sea, Arabian Sea and Arabian Gulf) around the Arabian Peninsula (AP) causing air movement enhancement towards inlands and hydrological cycle intensification. ...
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Billions of gallons of wastewater injected daily. sustainable?
Billions of gallons of water are removed each year from the hydrologic cycle and injected into underground formations thousands of feet below the earth's surface, never available again. Hydrologists agree that there is approximately less than 1% usable water for humans on our planet. With proven enhanced evaporation and recycling methods, why do we continue sending this precious resource ...
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A comparison between artificial neural network method and nonlinear regression method to estimate the missing hydrometric data
Missing values are a common problem faced in the analysis of hydrometric data. The need for complete hydrological data, especially hydrometric data for planning, development and designing hydraulic structures, has become increasingly important. Reasonably estimating these missing values is significant for the complete analysis and modeling of the hydrological cycle. The major objective of this ...
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Historical analysis of rationalizing South West coastal polders of Bangladesh
After more than a decade of meeting the designated objective of increasing productivity in agriculture, the South West coastal polders of Bangladesh have ended up as different man-made disasters. The failure of the polders to deliver the intended outcome is basically attributed to the lack of understanding of their hydro-morphological characteristics, inadequacy in their operation and ...
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Evaluation of climate change impacts on extreme rainfall events characteristics using a synoptic weather typing-based daily precipitation downscaling model
Climate change has impacted all phenomena in the hydrologic cycle, especially extreme events. General circulation models (GCMs) are used to investigate climate change impacts but because of their low resolution, downscaling methods are developed to provide data with high enough resolution for regional studies from GCM outputs. The performance of rainfall downscaling methods is commonly ...
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Surface Runoff
Surface runoff is the water flow that occurs when soil is infiltrated to full capacity and excess water from rain, snowmelt, or other sources flows over the land. This is a major component of the hydrologic cycle. Runoff that occurs on surfaces before reaching a channel is also called a nonpoint source. If a nonpoint source contains man-made contaminants, the runoff is called nonpoint source ...
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A critical review of groundwater utilization and management in China's inland water shortage areas
Groundwater, as an important store of freshwater, plays a more critical role in sustaining the ecosystem and enhancing human adaptation to changing climate than surface water. In particular, it can store large volumes of water to naturally buffer the pressure of water shortage against seasonal changes in rainfall. However, groundwater itself is also vulnerable to climate change, showing a ...
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`How will Climate Change Affect Agriculture?
Agriculture and climate change are inextricably linked—crop yield, biodiversity, and water use, as well as soil health are directly affected by a changing climate. Climate change, which is largely a result of burning fossil fuels, is already affecting the Earth’s temperature, precipitation, and hydrological cycles. Continued changes in the frequency and intensity of precipitation, ...
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A new hybrid drought-monitoring framework based on nonparametric standardized indicators
A drought is a multi-dimensional event characterized by changes in the atmospheric and land conditions. Hence, monitoring a single drought indicator may be insufficient for water management. The hybrid drought index (HDI) is presented as a nonparametric composite indicator for monitoring multiple components of the hydrologic cycle. The properties of the HDI can be summarized as follows: (1) ...
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Application of generalized regression neural network and support vector regression for monthly rainfall forecasting in western Jilin Province, China
Rainfall is a key part of the hydrological cycle, and correct forecasting of rainfall is vital in the planning and management of water resources. Generalized regression neural network (GRNN) and support vector regression (SVR) were both applied to forecast monthly rainfall, and the conventional autoregressive model was built for comparison. Furthermore, Akaike Information Criteria were used to ...
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The irruption of new agro-industrial technologies in Uruguay and their environmental impacts on soil, water supply and biodiversity: a review
In recent years, economic growth has produced a global change in the demand for food, fibre and energy supply. This has gone together with the globalisation of the agro-industrial production systems, leading to a qualitative change in land use because of intensive use of technological inputs. Uruguay, just as the other countries of the region, is part of this phenomenon. The massive introduction ...
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Enhanced Evaporation Lowest Wastewater Treatment Cost
When considering wastewater treatment cost, enhanced evaporation should be at the forefront of your discussion since the per 1000 gallons of evaporated wastewater is the lowest in the marketplace. Usually, evaporation ponds are designed and engineered solely on local pan evaporation rates. However, adding an efficient enhanced evaporation system will accelerate removal and withdraw the burden ...
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Assessment of future climate change impacts on the hydrological regime of selected Greek areas with different climate conditions
Assessment of future variations of streamflow is essential for research regarding climate and climate change. This study is focused on three agricultural areas widespread in Greece and aims to assess the future response of annual and seasonal streamflow and its impacts on the hydrological regime, in combination with other fundamental aspects of the hydrological cycle in areas with different ...
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