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Geoinformatic Intelligence Methodologies for Drought Spatiotemporal Variability in Greece

Kanellou, Efrosyni; Spyropoulos, Nicos; Dalezios, Nicolas - In: Water Resources Management 26 (2012) 5, pp. 1089-1106

goal is to use the PCA + clustering method to transform the RDI temporal data (1982–2001) and cluster the different regions … indices followed by Clustering that was based on certain eigenchannels resulted from the previous PCA analysis. Both methods …

Persistent link: https://www.econbiz.de/10010794247

Effect of Global Warming on Intensity and Frequency Curves of Precipitation, Case Study of Northwestern Iran

Roshan, Gholamreza; Ghanghermeh, AbdolAzim; Nasrabadi, … - In: Water Resources Management 27 (2013) 5, pp. 1563-1579

such natural hazards in northwestern Iran is considered in this study through clustering the precipitation regime. To … downscaled using the LARS-WG model. The method for comparing precipitations was done based on clustering in the form of 5 …

Persistent link: https://www.econbiz.de/10010997820

Identification of Homogeneous Rainfall Regimes in Northeast Region of India using Fuzzy Cluster Analysis

Goyal, Manish; Gupta, Vivek - In: Water Resources Management 28 (2014) 13, pp. 4491-4511

clustering algorithm (FCM). A comparison is also performed using K- Mean clustering algorithm. Additionally, regional homogeneity …

Persistent link: https://www.econbiz.de/10010998139

SPI Modes of Drought Spatial and Temporal Variability in Portugal: Comparing Observations, PT02 and GPCC Gridded Datasets

Raziei, Tayeb; Martins, Diogo; Bordi, Isabella; Santos, … - In: Water Resources Management 29 (2015) 2, pp. 487-504

Regional drought modes in Portugal are identified applying the Principal Component Analysis (PCA) and Varimax rotation to the Standardized Precipitation Index (SPI) computed on various time scales using the three precipitation datasets covering the period 1950–2003: (i) The observation dataset...

Persistent link: https://www.econbiz.de/10011151777

Spatial Variability of Drought: An Analysis of the SPI in Sicily

Bonaccorso, B.; Bordi, I.; Cancelliere, A.; Rossi, G.; … - In: Water Resources Management 17 (2003) 4, pp. 273-296

An analysis of drought in Sicily from 1926 to 1996 is presented.In identifying drought over the region, both the NCEP/NCARreanalysis precipitation data and those observed in 43 gauges,located quite uniformly over the territory of the Island, areused. Drought occurrence is estimated by means of...

Persistent link: https://www.econbiz.de/10010794261

Effect of Ageing of Pipe and Lining Materials on Elemental Composition of Suspended Particles in a Water Distribution System

Fujita, Masafumi; Ishiwatari, Yoshiyuki; Mishima, Iori; … - In: Water Resources Management 28 (2014) 6, pp. 1645-1653

Water samples collected from a drinking water supply system were assessed for elemental composition (Al, Si, Ca, Mn, Fe and Zn) of suspended particles. Particulate Fe, Mn and Al concentrations were significantly correlated even though their origins are considered to be different. The results of...

Persistent link: https://www.econbiz.de/10010794392

Application of Principal Component Analysis in Grouping Geomorphic Parameters for Hydrologic Modeling

Singh, P.; Kumar, Virendra; Purohit, R.; Kothari, Mahesh; … - In: Water Resources Management 23 (2009) 2, pp. 325-339

Principal component analysis has been applied to thirteen dimensionless geomorphic parameters for sixteen watersheds of the Chambal catchment of Rajasthan, India, in order to group the parameters under different components based on significant correlations. Results of the principal component...

Persistent link: https://www.econbiz.de/10010794513

Differences in Spatial Patterns of Drought on Different Time Scales: An Analysis of the Iberian Peninsula

Vicente-Serrano, Sergio - In: Water Resources Management 20 (2006) 1, pp. 37-60

The differences in spatial patterns of drought over a range of time scales were analysed by the Standardized Precipitation Index (SPI). In a climatic area with a wide range of precipitation characteristics (the Iberian Peninsula), Pearson III distribution is flexible enough to calculate the...

Persistent link: https://www.econbiz.de/10010794664

An Application of GPCC and NCEP/NCAR Datasets for Drought Variability Analysis in Iran

Raziei, Tayeb; Bordi, Isabella; Pereira, Luis - In: Water Resources Management 25 (2011) 4, pp. 1075-1086

The lack of reliable and updated precipitation datasets is the most important limitation that hinders establishing a drought monitoring and early warning system in Iran. To overcome this obstacle, we have evaluated the applicability of GPCC and NCEP/NCAR precipitation datasets for drought...

Persistent link: https://www.econbiz.de/10010794808

Optimization of River Water Quality Surveys by Multivariate Analysis of Physicochemical, Bacteriological and Ecotoxicological Data

Gomes, Ana; Pires, José; Figueiredo, Sónia; … - In: Water Resources Management 28 (2014) 5, pp. 1345-1361

This study aims to optimize the water quality monitoring of a polluted watercourse (Leça River, Portugal) through the principal component analysis (PCA) and cluster analysis (CA). These statistical methodologies were applied to physicochemical, bacteriological and ecotoxicological data (with...

Persistent link: https://www.econbiz.de/10010997260