| Global NEST Journal

Drainage network flow anomaly classification based on XGBoost

by

Tai YJ et al. View all

Issue 4

Environmental data analysis and modelling

Identifying and classifying anomalies in on-line monitoring systems of drainage systems is important to reduce urban water pollution. In the context of big data, the mini-batch K-means combined with the XGBoost drainage network abnormal flow identification and classification model is proposed to...

traffic anomaly classification recognition +2 more

Future climate uncertainty and spatial variability over Tamilnadu State, India

by

D. Rajalakshmi et al. View all

Issue 1

Climate change

The present study analyses future climate uncertainty for the 21st century over Tamilnadu state for six weather parameters: solar radiation, maximum temperature, minimum temperature, relative humidity, wind speed and rainfall. The climate projection data was dynamically downscaled using high...

Climate uncertainty PRECIS +3 more

Area-differentiated modeling of water balance in Pinios Basin, central Greece

by

Evangelos Tziritis et al. View all

Issue 2

Hydrology and Water Resources Management

GROWA is a modular grid based empirical hydrological model that is being used to address practical water resources management related issues. It has been successfully applied in typical hydrological and hydrogeological setups of northern European basins ranging typically between meso-scale river...

water balance water resources management +4 more

Spatial and seasonal patterns of precipitation in Greece: the terrain segmentation approach

by

Aschonitis V. et al. View all

Issue 5

Hydrology and Water Resources Management

The aim of the study is to investigate the spatial and seasonal variation of precipitation in Greece using multi-temporal data analysis techniques. Mean monthly precipitation grids of 1 km 2 resolution of the period 1950-2000 were used in the analysis. Cross correlation quantified spatio-temporal...

imagery correlations principal components +3 more

Modeling the effect of vegetation on river floodplain hydraulics

by

Stamou A.I., Papadonikolaki G., Gkesouli A. and Nikoletopoulos A.

Issue 3

General

Vegetation in river floodplains has significant influence on the flood hydraulics and fate of suspended sediments, nutrients and contaminants. In the present, work preliminary 3-D calculations were performed to examine the effect of vegetation on the mean flow in open channels using the CFD model...

Vegetation eco-hydraulics +4 more

Multivariate stochastic downscaling models for generating precipitation and temperature scenarios of climate change based on atmospheric circulation

by

Panagoulia D., Bardossy A. and Lourmas G.

Issue 2

General

The spatial resolution of General Circulation Models (GCMs) is too coarse to represent regional climate changes at the scales required for environmental impact assessment. Therefore, downscaling of precipitation and temperature has to be carried out from the GCM grids to smaller scales of a few...

atmospheric circulation automated objective classification +6 more

Future changes in the occurrence of extreme precipitation events in Eastern Mediterranean

by

Oikonomou Ch., Flocas H.A., Hatzaki M., Asimakopoulos D.N. and Giannakopoulos C.

Issue 2

General

The aim of this study is to estimate future potential changes in duration of extreme dry and wet spells and rainfall intensity in Eastern Mediterranean. For this purpose, daily precipitation amounts, deriving from the regional climate model of UK Hadley Centre HadRM3P have been used for the present...

daily precipitation climatic indices +3 more

Forecasting mesoscale precipitation using the MM5 model with the four-dimensional data assimilation (FDDA) technique

by

Yamazaki Y. and Orgaz M.D.M.

Issue 3

General

The two basic forms of multi-scale data assimilation procedures (FDDA), based on Newtonian relaxation, of analysis and observations nudging have been applied for precipitation event period occurred over Portugal during summer season, using the Fifth Generation Mesoscale Model (MM5) developed and...

Mesoscale forecast +2 more

Spatial and Temporal Distribution of Air Temperature in the Northern Hemisphere

by

Philandras C.M., Nastos P. Th., Kanellopoulou E.A. and Paliatsos A.G.

Issue 3

General

In the present study, the spatial and temporal surface air temperature variability for the Northern Hemisphere has been examined, for the period 1900-1996. Factor Analysis has been applied to 5o Latitude x 10o Longitude grid box data covering the area from almost the equator to 70o N. These data are...

factor analysis Air temperature +1 more

Coastal modelling with a GIS bathymetric module

by

Tsanis I.K., Naoum S. and Fullarton M.

Issue 1

General

A 3D hydrodynamic/pollutant transport model was used to simulate the currents and pollutant transport in coastal areas. The bathymetric and shoreline data was provided to the model via a GIS module that operates in the ArcView GIS environment. The module is efficient and capable of generating...

ArcView GIS Coastal Hydrodynamics +1 more

On the relation between sea surface and lower temperature over the northern hemisphere

by

Bartzokas A., Metaxas D.A. and Giles B.D.

Issue 2

General

In this work the covariability of sea surface and lower troposphere temperatures (SST-AT) is investigated for winter (DJFM) and summer (JJAS), over the whole northern hemisphere, by utilizing monthly anomalies in grid boxes for a 22-year period. Air temperature variations in the lower troposphere...

northern hemisphere factor analysis +3 more

Effect of the land use change characteristics on the air pollution patterns above the Greater Athens area (GAA) after 2004

by

Fameli K.M. et al. View all

Issue 2

General

The Attica Peninsula has experienced the rapid expansion of the Athens urban area, prior to the Athens 2004 Olympics. As a result, the distribution of pollutant sources and emission patterns has changed with a subsequent effect on the distribution of photochemical pollutants and aerosols. The...

A spatially allocated emissions inventory for Cyprus

by

Tsilingiridis G., Sidiropoulos C., Pentaliotis A., Evripidou C., Papastavros C., Mesimeris T. and Pa... View all

Issue 1

General

In this paper, a detailed spatial allocated emissions inventory for Cyprus is presented. Topdown and bottom-up methodologies are implemented and emissions are estimated from all anthropogenic sources for the reference year 2002 with the aid of state-of-the-art algorithms. Emission factors...

Air Pollutants air quality +3 more

An air quality management system for Cyprus

by

Moussiopoulos N., Douros I., Tsegas G., Kleanthous S. and Chourdakis E.

Issue 1

General

The new Air Quality Directive (2008/50/EC) encourages the introduction of modelling as a necessary tool for air quality assessment and management. Towards this aim, a new Air Quality Management System (AQMS) has been developed and installed in the Department of Labour Inspection of the Republic of...

air quality Air quality management +4 more

Study of future climatic variations of a teleconnection pattern affecting Eastern Mediterranean

by

Hatzaki M., Flocas H.A., Maheras P., Asimakopoulos D.N., and Giannakopoulos C.

Issue 3

General

A teleconnection pattern has been identified between Eastern Mediterranean and Northwestern Europe in the geopotential fields of the upper troposphere (hereafter will be referred to as EMP) during winter and it seems to play significant role in the large-scale atmospheric circulation over...

teleconnection patterns climatic changes +3 more