نتایج جستجو برای: climatic indices
تعداد نتایج: 113690 فیلتر نتایج به سال:
Long-term variability of bioassessments has not been well evaluated. We analyzed a 20-year data set (1984-2003) from four sites in two northern California streams to examine the variability of bioassessment indices (two multivariate RIVPACS-type O/E scores and one multimetric index of biotic integrity, IBI), as well as eight metrics. All sites were sampled in spring; one site was also sampled i...
Crater degradation on Mars is a key to understand erosion through time. Strongly eroded craters in the highlands are interpreted to be the result of enhanced erosion rate during the Noachian epoch [1]. While fluvial valleys climatic meaning and duration are still difficult to define (strongly warmer climate or episodic activity under slightly warmer climate), the enhanced Noachian craters degra...
An Integrated Extreme Climatic Index (IECI) is defined for analyzing the overall trend of change in the frequencies of major extreme climatic events over mainland China. The index is composed of 7 individual extreme indicators, i.e. the country-averaged frequencies of high temperature, low temperature, intense precipitation, dust storm and strong wind events, meteorological drought area percent...
Data mining for evolution of association rules for droughts and floods in India using climate inputs
[1] An accurate prediction of extreme rainfall events can significantly aid in policy making and also in designing an effective risk management system. Frequent occurrences of droughts and floods in the past have severely affected the Indian economy, which depends primarily on agriculture. Data mining is a powerful new technology which helps in extracting hidden predictive information (future t...
Rainfall prognosis plays an important role in drought management and planning of drinking water and agricultural water resources. Also, Future policies can be tailored to optimize spending and maximum productivity. In this study, the effect of large-scale climatic signals on rainfall in Mazandaran province was investigated. The first, the effect of climatic signals on precipitation simultan...
the west of esfahan province, iran, is one of the most important agricultural areas throughout the country due to the climate variability and life-giving water of zayanderood river. rice is one of the major and economic crops in this area. the most important climatic elements in agricultural activities which should be considered include temperature, relative humidity, precipitation and wind. so...
In order to define a surrogate index instead of climatic indices for analyzing and monitoring droughts, monthly rainfall data ( period of growth from March to September) of 36 stations spread over Esfahan and NOAA satellite images during the 1997- 2003 period were prepared and processed. The climatic index of SPI was computed from monthly rainfall and the Normalized Difference Vegetation Inde...
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