Hydrometeorology Pdf

[Shanta Plansinis]

Hydrometeorologyis a branch of meteorology and hydrology that studies the transfer of water and energy between the land surface and the lower atmosphere for academic research, commercial gain or operational forecasting purposes.

Whilst traditionally meteorologists and hydrologists sit within separate organisations, hydrometeorlogists may work in joint project teams, virtual teams, deal with specific incidents or be permanently co-located to deliver specific objectives. Hydrometeorlogists typically have a foundation in one or other discipline before undertaking additional training and specialist forecaster training depending on requirements. The cross over skills and knowledge between the two disciplines can bring organisational benefits in terms of efficiencies in terms of using tools and data available, and provide benefits in terms of enhanced lead times ahead of hydrometeological hazards occurring.

UNESCO has several programs and activities in place that deal with the study of natural hazards of hydrometeorological origin and the mitigation of their effects.[1] Among these hazards are the results of natural processes and atmospheric, hydrological, or oceanographic phenomena such as floods, tropical cyclones, drought, and desertification. Many countries have established an operational hydrometeorological capability to assist with forecasting, warning, and informing the public of these developing hazards.

One of the more significant aspects of hydrometeorology involves predictions about and attempts to mitigate the effects of high precipitation events.[2] There are three primary ways to model meteorological phenomena in weather forecasting, including nowcasting, numerical weather prediction, and statistical techniques.[3] Nowcasting is good for predicting events a few hours out, utilizing observations and live radar data to combine them with numerical weather prediction models.[3] The primary technique used to forecast weather, numerical weather prediction uses mathematical models to account for the atmosphere, ocean, and many other variables when producing forecasts.[3] These forecasts are generally used to predict events days or weeks out.[3] Finally, statistical techniques use regressions and other statistical methods to create long-term projections that go out weeks and months at a time.[3] These models allow scientists to visualize how a multitude of different variables interact with one another, and they illustrate one grand picture of how the Earth's climate interacts with itself.[4]

A major component of hydrometeorology is mitigating the risk associated with flooding and other hydrological threats. First, there has to be knowledge of the possible hydrological threats that are expected within a specific region.[3] After analyzing the possible threats, warning systems are put in place to quickly alert people and communicate to them the identity and magnitude of the threat.[3] Many nations have their own specific regional hydrometeorological centers that communicate threats to the public. Finally, there must be proper response protocols in place to protect the public during a dangerous event.[3]

Take a look at what professionals in each of these areas study. To understand the depth and breadth of our teaching and research, look at how these complementary areas guide our teaching and research efforts on the Research Focus Areas page.

Atmospheric Scientists mainly study the Earth's atmosphere (mainly the troposphere) with a focus on understanding and forecasting the processes that give rise to our weather. Important variables include temperature, pressure, water vapor, and the gradients and interactions of each variable, and how they change in time. Although meteorologists now rely heavily on computer models (numerical weather prediction), it is still relatively common to use techniques and conceptual models that were developed before computers were powerful enough to make predictions accurately or efficiently. Meteorologists are mainly trained within Departments of Atmospheric Science.

Hydrometeorologists mainly study both the atmospheric and terrestrial phases of the hydrological cycle, with emphasis on the interrelationship between them (i.e. the transfers of water and energy between the land surface and the lower atmosphere). Accordingly, the science of hydrometeorology bridges across both hydrology and meteorology. For example, hydrometeorologists are interested in the study of natural hazards of hydrometeorological origin and the mitigation of their effects. Among these hazards are the results of natural processes or phenomena of atmospheric, hydrological or oceanographic nature, such as floods, tropical cyclones, drought and desertification, and the potential impacts of land-cover change and changing climate. Major and important processes of interest to hydrometeorologists are precipitation and evapotranspiration, and also how the land surface partitions energy into different components (sensible, latent, ground heat flux) and how this then affects the overlying atmosphere. This area of emphasis may be achieved through the Atmospheric Science major or Hydrology major.

Hydrologists mainly study the movement, distribution, and quality of water on Earth (but could also be other planets). They are interested in the water cycle, the space-time availability and quality of water resources, and in environmental watershed sustainability. They collect and analyze data to help solve water related problems such as environmental preservation, natural disasters, and water management. The science of hydrology subdivides mainly into surface water hydrology and groundwater hydrology (hydrogeology). Oceanography and meteorology are typically not included because water is only one of many important aspects within those fields. Hydrologists are mainly trained within Departments of Civil Engineering, Environmental Science/Engineering, Geology, Physical Geography, or Earth Science. There are only a few schools--like us at the University of Arizona--that have dedicated departments which study hydrology and water resources.

The main goal of the Hydrometeorological Applications Program is to provide relevant information to high-impact weather, flood warning, and water resource decision makers through directed and basic research and development in hydrometeorology, aerosol-precipitation interactions, very short term precipitation nowcasting, cloud microphysical modeling, and winter weather.

The Hydrometeorology course begins with a specific focus on the water cycle and how water in all three phases (solid, vapor, liquid) exists and moves within the surface-subsurface-atmosphere continuum. Additionally, the course addresses topics including interpretation of hydrometeorology using dual polarization radar, cloud and precipitation formation, the mechanisms involved in extreme precipitation (snow, ice, convective precipitation, and non-convective precipitation), floods, drought, precipitation monitoring and forecasting, and evapotranspiration. These topics are further covered as related to local versus regional, versus global scales and how these processes impact human systems.

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It is the policy of the University to excuse the absences of students that result from religious observances and to reschedule examinations and additional required classwork that may fall on religious holidays, without penalty. [See Faculty Handbook 3.15.2]

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This second edition explores some of the latest techniques used to provide forecasts for a wide range of water-related applications in areas such as floods, droughts, water resources and environmental impacts. The practical uses can range from decisions on whether to issue a flood warning through to providing longer-term advice such as on when to plant and harvest crops or how to operate reservoirs for water supply and hydropower schemes. It provides an introduction to the topic for practitioners and researchers and useful background for courses in areas such as civil engineering, water resources, meteorology and hydrology.

As in the first edition, the first section considers topics such as monitoring and forecasting techniques, demand forecasting and how forecasts are interpreted when issuing warnings or advice. Separate chapters are now included for meteorological and catchment monitoring techniques allowing a more in-depth discussion of topics such as weather radar and water quality observations. The chapters on meteorological and hydrological forecasting now include a greater emphasis on rainfall forecasting and ensemble and probabilistic techniques. Regarding the interpretation of forecasts, an updated chapter discusses topics such as approaches to issuing warnings and the use of decision support systems and risk-based techniques.

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