Study on the Transfer Threshold from Meteorological to Hydrological Drought in Dongjiang River Basin
The study on transfer threshold between different drought types can effectively analyze the occurrence law and mechanism of drought transfer,especially the study on transfer threshold from meteorological drought to hydrological drought.Taking the Dongjiang River Basin as the research object,this pap...
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Editorial Office of Pearl River
2021-01-01
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| Series: | Renmin Zhujiang |
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| Online Access: | http://www.renminzhujiang.cn/thesisDetails#10.3969/j.issn.1001-9235.2021.07.002 |
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| author | MO Xiaomei TU Xinjun WANG Tian XIE Yuting ZHAO Guoyang |
| author_facet | MO Xiaomei TU Xinjun WANG Tian XIE Yuting ZHAO Guoyang |
| author_sort | MO Xiaomei |
| collection | DOAJ |
| description | The study on transfer threshold between different drought types can effectively analyze the occurrence law and mechanism of drought transfer,especially the study on transfer threshold from meteorological drought to hydrological drought.Taking the Dongjiang River Basin as the research object,this paper calculates the standardized precipitation index (SPI) and the standardized runoff index (SRI) at month scale,identifies and extracts the drought events and their characteristics,including drought duration and drought severity based on the run theory,matches the meteorological drought events and hydrological drought events that occur at the fully or partially same time,fits the edge distribution of the matched drought characteristic attributes to verify the correlation between the duration or severity of meteorological and hydrological droughts,establishes the joint distribution models of meteorological drought and hydrological drought based on two-variable Copula function,calculates the conditional probability of different grades of hydrological drought (moderate drought,severe drought and extreme drought) under different meteorological drought conditions,and takes the drought duration or severity value corresponding to the conditional probability of 0.95 as the drought duration or severity threshold for the transfer of meteorological drought to the hydrological drought of this grade.The results show that:The optimal fit functions of meteorological drought duration and severity in the Dongjiang River Basin were gamma distribution.The optimal fit function of hydrological drought duration is gamma distribution,and the marginal distribution function of hydrological drought severity was generalized normal distribution.The drought duration and severity were better when fitting by the Gumbel-copula function.The thresholds of drought duration of middle,severe and extreme drought grades in Dongjiang River basin were 6.9 months,8.3 months,9.4 months,respectively.While the thresholds of drought severity were 4.6,5.7 and 6.6,respectively.Drought transfer threshold can provide reference for hydrological drought prediction and government decision-making of drought prevention and mitigation. |
| format | Article |
| id | doaj-art-53cadd4271144545a206599d56bb6fcc |
| institution | Kabale University |
| issn | 1001-9235 |
| language | zho |
| publishDate | 2021-01-01 |
| publisher | Editorial Office of Pearl River |
| record_format | Article |
| series | Renmin Zhujiang |
| spelling | doaj-art-53cadd4271144545a206599d56bb6fcc2025-01-15T02:28:19ZzhoEditorial Office of Pearl RiverRenmin Zhujiang1001-92352021-01-014247646577Study on the Transfer Threshold from Meteorological to Hydrological Drought in Dongjiang River BasinMO XiaomeiTU XinjunWANG TianXIE YutingZHAO GuoyangThe study on transfer threshold between different drought types can effectively analyze the occurrence law and mechanism of drought transfer,especially the study on transfer threshold from meteorological drought to hydrological drought.Taking the Dongjiang River Basin as the research object,this paper calculates the standardized precipitation index (SPI) and the standardized runoff index (SRI) at month scale,identifies and extracts the drought events and their characteristics,including drought duration and drought severity based on the run theory,matches the meteorological drought events and hydrological drought events that occur at the fully or partially same time,fits the edge distribution of the matched drought characteristic attributes to verify the correlation between the duration or severity of meteorological and hydrological droughts,establishes the joint distribution models of meteorological drought and hydrological drought based on two-variable Copula function,calculates the conditional probability of different grades of hydrological drought (moderate drought,severe drought and extreme drought) under different meteorological drought conditions,and takes the drought duration or severity value corresponding to the conditional probability of 0.95 as the drought duration or severity threshold for the transfer of meteorological drought to the hydrological drought of this grade.The results show that:The optimal fit functions of meteorological drought duration and severity in the Dongjiang River Basin were gamma distribution.The optimal fit function of hydrological drought duration is gamma distribution,and the marginal distribution function of hydrological drought severity was generalized normal distribution.The drought duration and severity were better when fitting by the Gumbel-copula function.The thresholds of drought duration of middle,severe and extreme drought grades in Dongjiang River basin were 6.9 months,8.3 months,9.4 months,respectively.While the thresholds of drought severity were 4.6,5.7 and 6.6,respectively.Drought transfer threshold can provide reference for hydrological drought prediction and government decision-making of drought prevention and mitigation.http://www.renminzhujiang.cn/thesisDetails#10.3969/j.issn.1001-9235.2021.07.002drought transferthresholdCopula functionmeteorological droughthydrological droughtDongjiang River Basin |
| spellingShingle | MO Xiaomei TU Xinjun WANG Tian XIE Yuting ZHAO Guoyang Study on the Transfer Threshold from Meteorological to Hydrological Drought in Dongjiang River Basin Renmin Zhujiang drought transfer threshold Copula function meteorological drought hydrological drought Dongjiang River Basin |
| title | Study on the Transfer Threshold from Meteorological to Hydrological Drought in Dongjiang River Basin |
| title_full | Study on the Transfer Threshold from Meteorological to Hydrological Drought in Dongjiang River Basin |
| title_fullStr | Study on the Transfer Threshold from Meteorological to Hydrological Drought in Dongjiang River Basin |
| title_full_unstemmed | Study on the Transfer Threshold from Meteorological to Hydrological Drought in Dongjiang River Basin |
| title_short | Study on the Transfer Threshold from Meteorological to Hydrological Drought in Dongjiang River Basin |
| title_sort | study on the transfer threshold from meteorological to hydrological drought in dongjiang river basin |
| topic | drought transfer threshold Copula function meteorological drought hydrological drought Dongjiang River Basin |
| url | http://www.renminzhujiang.cn/thesisDetails#10.3969/j.issn.1001-9235.2021.07.002 |
| work_keys_str_mv | AT moxiaomei studyonthetransferthresholdfrommeteorologicaltohydrologicaldroughtindongjiangriverbasin AT tuxinjun studyonthetransferthresholdfrommeteorologicaltohydrologicaldroughtindongjiangriverbasin AT wangtian studyonthetransferthresholdfrommeteorologicaltohydrologicaldroughtindongjiangriverbasin AT xieyuting studyonthetransferthresholdfrommeteorologicaltohydrologicaldroughtindongjiangriverbasin AT zhaoguoyang studyonthetransferthresholdfrommeteorologicaltohydrologicaldroughtindongjiangriverbasin |