Decadal fluctuations in the consumption of irrigation water during the rainy season, Lower Mekong River
Identifieur interne : 001113 ( Istex/Corpus ); précédent : 001112; suivant : 001114Decadal fluctuations in the consumption of irrigation water during the rainy season, Lower Mekong River
Auteurs : Hiroaki Somura ; Koshi Yoshida ; Hajime TanjiSource :
- Hydrological Processes [ 0885-6087 ] ; 2008-04-30.
English descriptors
- KwdEn :
Abstract
The importance of proper water management means that the consumption of irrigation water should be estimated even in areas where data are scarce. The Mekong River, particularly the lower part, is one area where irrigation water has received little research attention. Studies that seek to estimate the use of irrigation water in this area are restricted by a lack of hydrological data; consequently, alternative methods are required to obtain these data. One solution is the use of model simulations. The main difference between our approach and existing irrigation‐water estimation models is that we consider agricultural data in estimating the use of irrigation water, especially that used for rice production, as these data are relatively easy to collect. As a result, rice production during the rainy season in the target area was computed for 10 years with errors of less than 30%. The average values of calculated and observed rice yields per hectare were 1·3 and 1·7 t/ha in Thailand, 2·5 and 2·7 t/ha in Lao PDR, and 1·2 and 1·3 t/ha in Cambodia, respectively. In addition, we clarified decadal fluctuations in horizontal supplied (HS) water and irrigation water. The average values of HS water supplied to the paddy fields during the simulation period were approximately 17·2 km3/rainy season in Thailand (388 mm), 0·81 km3/rainy season in Lao PDR (245 mm), and 4·4 km3/rainy season in Cambodia (322 mm). Comparisons with HS water (7·4 km3/rainy season) and the existing requirements for irrigation water revealed that the simulation yielded acceptable values, thus verifying the reproducibility of the model results. Finally, we calculated the average water balances during the growth period for rice. The highest amount of irrigation water per unit irrigated area during the rainy season was used in Lao PDR, though the volume of irrigation water was greatest in Thailand. Copyright © 2008 John Wiley & Sons, Ltd.
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DOI: 10.1002/hyp.6940
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ISTEX:2717D416DC9ACE3D851851BFD84B3C4D60A85C32Le document en format XML
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The Mekong River, particularly the lower part, is one area where irrigation water has received little research attention. Studies that seek to estimate the use of irrigation water in this area are restricted by a lack of hydrological data; consequently, alternative methods are required to obtain these data. One solution is the use of model simulations. The main difference between our approach and existing irrigation‐water estimation models is that we consider agricultural data in estimating the use of irrigation water, especially that used for rice production, as these data are relatively easy to collect. As a result, rice production during the rainy season in the target area was computed for 10 years with errors of less than 30%. The average values of calculated and observed rice yields per hectare were 1·3 and 1·7 t/ha in Thailand, 2·5 and 2·7 t/ha in Lao PDR, and 1·2 and 1·3 t/ha in Cambodia, respectively. In addition, we clarified decadal fluctuations in horizontal supplied (HS) water and irrigation water. The average values of HS water supplied to the paddy fields during the simulation period were approximately 17·2 km3/rainy season in Thailand (388 mm), 0·81 km3/rainy season in Lao PDR (245 mm), and 4·4 km3/rainy season in Cambodia (322 mm). Comparisons with HS water (7·4 km3/rainy season) and the existing requirements for irrigation water revealed that the simulation yielded acceptable values, thus verifying the reproducibility of the model results. Finally, we calculated the average water balances during the growth period for rice. The highest amount of irrigation water per unit irrigated area during the rainy season was used in Lao PDR, though the volume of irrigation water was greatest in Thailand. 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In addition, we clarified decadal fluctuations in horizontal supplied (HS) water and irrigation water. The average values of HS water supplied to the paddy fields during the simulation period were approximately 17·2 km3/rainy season in Thailand (388 mm), 0·81 km3/rainy season in Lao PDR (245 mm), and 4·4 km3/rainy season in Cambodia (322 mm). Comparisons with HS water (7·4 km3/rainy season) and the existing requirements for irrigation water revealed that the simulation yielded acceptable values, thus verifying the reproducibility of the model results. Finally, we calculated the average water balances during the growth period for rice. The highest amount of irrigation water per unit irrigated area during the rainy season was used in Lao PDR, though the volume of irrigation water was greatest in Thailand. 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In addition, we clarified decadal fluctuations in horizontal supplied (HS) water and irrigation water. The average values of HS water supplied to the paddy fields during the simulation period were approximately 17·2 km3/rainy season in Thailand (388 mm), 0·81 km3/rainy season in Lao PDR (245 mm), and 4·4 km3/rainy season in Cambodia (322 mm). Comparisons with HS water (7·4 km3/rainy season) and the existing requirements for irrigation water revealed that the simulation yielded acceptable values, thus verifying the reproducibility of the model results. Finally, we calculated the average water balances during the growth period for rice. The highest amount of irrigation water per unit irrigated area during the rainy season was used in Lao PDR, though the volume of irrigation water was greatest in Thailand. 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The Mekong River, particularly the lower part, is one area where irrigation water has received little research attention. Studies that seek to estimate the use of irrigation water in this area are restricted by a lack of hydrological data; consequently, alternative methods are required to obtain these data. One solution is the use of model simulations. The main difference between our approach and existing irrigation‐water estimation models is that we consider agricultural data in estimating the use of irrigation water, especially that used for rice production, as these data are relatively easy to collect. As a result, rice production during the rainy season in the target area was computed for 10 years with errors of less than 30%. The average values of calculated and observed rice yields per hectare were 1·3 and 1·7 t/ha in Thailand, 2·5 and 2·7 t/ha in Lao PDR, and 1·2 and 1·3 t/ha in Cambodia, respectively. In addition, we clarified decadal fluctuations in horizontal supplied (HS) water and irrigation water. The average values of HS water supplied to the paddy fields during the simulation period were approximately 17·2 km<sup>3</sup>/rainy season in Thailand (388 mm), 0·81 km<sup>3</sup>/rainy season in Lao PDR (245 mm), and 4·4 km<sup>3</sup>/rainy season in Cambodia (322 mm). Comparisons with HS water (7·4 km<sup>3</sup>/rainy season) and the existing requirements for irrigation water revealed that the simulation yielded acceptable values, thus verifying the reproducibility of the model results. Finally, we calculated the average water balances during the growth period for rice. The highest amount of irrigation water per unit irrigated area during the rainy season was used in Lao PDR, though the volume of irrigation water was greatest in Thailand. Copyright © 2008 John Wiley & Sons, Ltd.</p></abstract></abstractGroup></contentMeta></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Decadal fluctuations in the consumption of irrigation water during the rainy season, Lower Mekong River</title></titleInfo><titleInfo type="abbreviated" lang="en"><title>CONSUMPTION OF IRRIGATION WATER DURING THE RAINY SEASON IN LOWER MEKONG RIVER BASIN</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>Decadal fluctuations in the consumption of irrigation water during the rainy season, Lower Mekong River</title></titleInfo><name type="personal"><namePart type="given">Hiroaki</namePart><namePart type="family">Somura</namePart><affiliation>Faculty of Life and Environmental Science, Shimane University, 1060 Nishikawatsu, Matsue, Shimane 690‐8504, Japan</affiliation><affiliation>Faculty of Life and Environmental Science, Shimane University, 1060 Nishikawatsu, Matsue, Shimane 690‐8504, Japan.===</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Koshi</namePart><namePart type="family">Yoshida</namePart><affiliation>Graduate School of Agricultural and Life Sciences, University of Tokyo, 1‐1‐1 Yayoi, Bunkyo‐ku, Tokyo 113‐8657, Japan</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Hajime</namePart><namePart type="family">Tanji</namePart><affiliation>National Institute for Rural Engineering, 2‐1‐6 Kan‐non dai, Tsukuba, Ibaraki 305‐8609, Japan</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="article" displayLabel="article"></genre><originInfo><publisher>John Wiley & Sons, Ltd.</publisher><place><placeTerm type="text">Chichester, UK</placeTerm></place><dateIssued encoding="w3cdtf">2008-04-30</dateIssued><dateCaptured encoding="w3cdtf">2006-01-31</dateCaptured><dateValid encoding="w3cdtf">2007-03-26</dateValid><copyrightDate encoding="w3cdtf">2008</copyrightDate></originInfo><language><languageTerm type="code" authority="rfc3066">en</languageTerm><languageTerm type="code" authority="iso639-2b">eng</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType><extent unit="figures">11</extent><extent unit="tables">3</extent><extent unit="references">16</extent></physicalDescription><abstract lang="en">The importance of proper water management means that the consumption of irrigation water should be estimated even in areas where data are scarce. The Mekong River, particularly the lower part, is one area where irrigation water has received little research attention. Studies that seek to estimate the use of irrigation water in this area are restricted by a lack of hydrological data; consequently, alternative methods are required to obtain these data. One solution is the use of model simulations. The main difference between our approach and existing irrigation‐water estimation models is that we consider agricultural data in estimating the use of irrigation water, especially that used for rice production, as these data are relatively easy to collect. As a result, rice production during the rainy season in the target area was computed for 10 years with errors of less than 30%. The average values of calculated and observed rice yields per hectare were 1·3 and 1·7 t/ha in Thailand, 2·5 and 2·7 t/ha in Lao PDR, and 1·2 and 1·3 t/ha in Cambodia, respectively. In addition, we clarified decadal fluctuations in horizontal supplied (HS) water and irrigation water. The average values of HS water supplied to the paddy fields during the simulation period were approximately 17·2 km3/rainy season in Thailand (388 mm), 0·81 km3/rainy season in Lao PDR (245 mm), and 4·4 km3/rainy season in Cambodia (322 mm). Comparisons with HS water (7·4 km3/rainy season) and the existing requirements for irrigation water revealed that the simulation yielded acceptable values, thus verifying the reproducibility of the model results. Finally, we calculated the average water balances during the growth period for rice. The highest amount of irrigation water per unit irrigated area during the rainy season was used in Lao PDR, though the volume of irrigation water was greatest in Thailand. Copyright © 2008 John Wiley & Sons, Ltd.</abstract><note type="funding">Ministry of Education, Culture, Sports, Science and Technology (MEXT)</note><note type="funding">Japan Science and Technology Agency, Japan</note><subject lang="en"><genre>keywords</genre><topic>model simulation</topic><topic>supplementary water</topic><topic>rice production</topic><topic>paddy field</topic><topic>water management</topic><topic>Indochina</topic></subject><relatedItem type="host"><titleInfo><title>Hydrological Processes</title><subTitle>An International Journal</subTitle></titleInfo><titleInfo type="abbreviated"><title>Hydrol. Process.</title></titleInfo><name type="personal"><namePart type="given">Kuniyoshi</namePart><namePart type="family">Takeuchi</namePart></name><name type="personal"><namePart type="given">Hiroshi</namePart><namePart type="family">Ishidaira</namePart></name><name type="personal"><namePart type="given">Haruo</namePart><namePart type="family">Sawada</namePart></name><name type="personal"><namePart type="given">Takao</namePart><namePart type="family">Masumoto</namePart></name><genre type="journal">journal</genre><subject><genre>article-category</genre><topic>Research Article</topic></subject><identifier type="ISSN">0885-6087</identifier><identifier type="eISSN">1099-1085</identifier><identifier type="DOI">10.1002/(ISSN)1099-1085</identifier><identifier type="PublisherID">HYP</identifier><part><date>2008</date><detail type="title"><title>Studies on the Mekong River Basin ‐ Modelling of Hydrology and Water Resources</title></detail><detail type="volume"><caption>vol.</caption><number>22</number></detail><detail type="issue"><caption>no.</caption><number>9</number></detail><extent unit="pages"><start>1310</start><end>1320</end><total>11</total></extent></part></relatedItem><identifier type="istex">2717D416DC9ACE3D851851BFD84B3C4D60A85C32</identifier><identifier type="DOI">10.1002/hyp.6940</identifier><identifier type="ArticleID">HYP6940</identifier><accessCondition type="use and reproduction" contentType="copyright">Copyright © 2008 John Wiley & Sons, Ltd.</accessCondition><recordInfo><recordContentSource>WILEY</recordContentSource><recordOrigin>John Wiley & Sons, Ltd.</recordOrigin></recordInfo></mods></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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