Webb22 dec. 2015 · In this study, hydrological drought in the Yangtze River basin (YRB) is characterized based on Gravity Recovery and Climate Experiment (GRACE) total water storage (TWS). An artificial neural ... Webb1 jan. 2024 · For each grid, according to drought identification results during the study periods based on the run theory, annual drought frequency was the times of drought …
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Webb17 apr. 2024 · Droughts, considered one of the most dangerous and costly water cycle expressions, always occurs over a certain region, lasting several weeks or months, and involving multiple variables. In this work, a multivariate approach was used for the statistical characterization of hydrological droughts in Shaying River Basin with data … Webb15 nov. 1988 · Run theory has been identified as useful to hydrologists in the assessment of drought likelihood (Yevjevich, 1967, 1972). However, results of importance to …
Webb15 sep. 2024 · In this study, the duration and severity of the drought episodes are extracted from the GRACE-DSI time series using run theory based on the calculated GRACE-DSI values (Ma and Xia, 2011) (Fig. 2). We defined a drought episode as being when the GRACE-DSI value is less than -0.8 (threshold for moderate drought) for three consecutive … WebbThe runs theory proposed by Yevjevich (1967) suggests that a predefined threshold value could be used to indicate a drought event, in this case, a negative value of the index. ...
Webb30 okt. 2024 · sustainability Article Run Theory and Copula-Based Drought Risk Analysis for Songnen Grassland in Northeastern China Rina Wu 1, Jiquan Zhang 2,* , Yuhai Bao 3,* and Enliang Guo 3 1 School of Geography, Liaoning Normal University, Dalian 116029, China; [email protected] 2 School of Environment, Northeast Normal University, … Webb1 jan. 2024 · According to run theory, if the drought index in a certain month falls below the drought threshold, the month is considered a possible drought month. If the drought …
Webb... 'run theory' (Fig. 2) proposed by Yevjevich (1967), which has been applied frequently to time series of anomalous hydrologic events, was used to identify drought components …
Webb8 mars 2024 · run theory to characterize drought indices spi drought spei drought-indices Updated on Apr 18, 2024 R JonKing93 / pdsi Star 4 Code Issues Pull requests A Matlab function to calculate Palmer Drought Severity Index (PDSI) using monthly temperature and precipitation data. Can determine values for multiple sites simultaneously. board game about birdsWebb13 jan. 2024 · Drought monitoring is challenging, but it is required for improving agricultural production, protecting the ecological environment, and reducing economic losses in drought-prone regions such as the Mongolian Plateau (MP). This study is a systematic analysis of the spatiotemporal changes in the characteristics of drought events (drought … cliff fong interior designerWebb27 nov. 2024 · Meteorological and hydrological droughts characteristics, including drought duration and its magnitude, were determined by Run theory, using SPI and SDI at each station. Figure 4 demonstrates the characteristics of meteorological and hydrological droughts during 1973–2014 for Idenak, Jokang, Harmale, Mollasani, Gorgor, and … board game akin to go crossword clueDrought is usually studied trough indices which can be characterized in many ways. Here is show the use of the run theory to characterize a drought index (SPI). Drought characteristics (run theory) Many drought indices have been proposed in the literature, such as SPI, SPEI, PDSI, and others. Visa mer Many drought indices have been proposed in the literature, such as SPI, SPEI, PDSI, and others. The selection of one specific index is frequently … Visa mer Using synthetic precipitation data, the SPI index has been calculated. Later, the run_theory function is applied with a threshold of -.5. All this process is developed in … Visa mer Yevjevich, V. M. (1967). Objective approach to definitions and investigations of continental hydrologic droughts, An. Hydrology papers (Colorado State University); no. 23. Le, P. V., Phan‐Van, T., Mai, K. V., & Tran, D. Q. … Visa mer board game academy shopeeWebb21 maj 2024 · According to the theory of running distance, 21 droughts occurred in Northern Shaanxi during 1995–2010, among which 11 drought events lasted no more than 4 years and had no more than 4 drought intensity. The return period of these drought events was basically 1-2 years. board game about hitlerWebb16 jan. 2024 · This analysis based on run theory is also referred to as threshold level method. Here the standardized drought index (SDI) is used as the example to compute … board game about starting a farmWebb30 okt. 2024 · The run theory is one of the most commonly used methods for dividing drought events, which was first proposed by Yevjevich ( 1969 ). The division of drought events in traditional run theory is generally based on a single threshold. The subsequence continuously below the threshold is a run (i.e., a drought event). board game about trains