Influence of saltwater wedges on irrigation water near a river estuary
Paddy fields irrigated using water from the Shinkawa River in Niigata, Japan, are subject to adverse effects associated with the occurrence of saltwater wedges in the river. The extent of saltwater intrusion in the river varies, depending on river discharge and tidal amplitude. In this study, field...
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| Veröffentlicht in: | Paddy and water environment 2015-04, Vol.13 (2), p.179-189 |
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| description | Paddy fields irrigated using water from the Shinkawa River in Niigata, Japan, are subject to adverse effects associated with the occurrence of saltwater wedges in the river. The extent of saltwater intrusion in the river varies, depending on river discharge and tidal amplitude. In this study, field observations and numerical simulation of the Shinkawa River estuary were applied to ascertain the influence of saltwater wedges on paddy cultivation during the irrigation period. The saltwater wedge was surveyed using an echo-sounding profiling system (SC-3); results indicated that the longitudinal profiles of the saltwater wedge were 4.7 and 2.2 km from the river mouth sluice gate at the high water mark of spring tide and at the low water mark of neap tide, respectively. According to the vertical profiling using electrical conductivity (EC) meters at bridges crossing the river, there was a rigid interface between freshwater and saltwater with a thin halocline zone of approximately 0.25 m. These profiles were well reproduced by the one-dimensional, two-layer, unsteady flow model. The results of the model simulation and EC observation indicate that when the vertical position of the halocline rises to 1.2 m below the inlet of the water intake pumping station, the EC value rises sharply to 1,500 μs/cm, which is an unsuitable level for irrigation water. It is estimated that for about 23 % of the total irrigation period, pump operation is halted as a result of this mechanism. |
| doi_str_mv | 10.1007/s10333-014-0419-1 |
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The extent of saltwater intrusion in the river varies, depending on river discharge and tidal amplitude. In this study, field observations and numerical simulation of the Shinkawa River estuary were applied to ascertain the influence of saltwater wedges on paddy cultivation during the irrigation period. The saltwater wedge was surveyed using an echo-sounding profiling system (SC-3); results indicated that the longitudinal profiles of the saltwater wedge were 4.7 and 2.2 km from the river mouth sluice gate at the high water mark of spring tide and at the low water mark of neap tide, respectively. According to the vertical profiling using electrical conductivity (EC) meters at bridges crossing the river, there was a rigid interface between freshwater and saltwater with a thin halocline zone of approximately 0.25 m. These profiles were well reproduced by the one-dimensional, two-layer, unsteady flow model. The results of the model simulation and EC observation indicate that when the vertical position of the halocline rises to 1.2 m below the inlet of the water intake pumping station, the EC value rises sharply to 1,500 μs/cm, which is an unsuitable level for irrigation water. It is estimated that for about 23 % of the total irrigation period, pump operation is halted as a result of this mechanism.</description><identifier>ISSN: 1611-2490</identifier><identifier>EISSN: 1611-2504</identifier><identifier>DOI: 10.1007/s10333-014-0419-1</identifier><language>eng</language><publisher>Tokyo: Springer Japan</publisher><subject>Agriculture ; Biomedical and Life Sciences ; Brackish ; Computer simulation ; Echo surveys ; Ecotoxicology ; Estuaries ; Freshwater ; Geoecology/Natural Processes ; High water mark ; Hydrogeology ; Hydrology/Water Resources ; Irrigation ; Irrigation water ; Life Sciences ; Low water mark ; Mouth ; Neap tides ; Profiling ; Pumping stations ; Rice ; River discharge ; River flow ; River mouth ; Rivers ; Saline water ; Saline water intrusion ; Saline-freshwater interfaces ; Seawater ; Sluice gates ; Soil Science & Conservation ; Spring tides ; Tidal amplitude ; Unsteady flow ; Wedges</subject><ispartof>Paddy and water environment, 2015-04, Vol.13 (2), p.179-189</ispartof><rights>The International Society of Paddy and Water Environment Engineering and Springer Japan 2014</rights><rights>The International Society of Paddy and Water Environment Engineering and Springer Japan 2015</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c452t-8a8db940fa4575de6197453acba2c3f010df50e0f008489ea2bbe42bac2e30583</citedby><cites>FETCH-LOGICAL-c452t-8a8db940fa4575de6197453acba2c3f010df50e0f008489ea2bbe42bac2e30583</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1007/s10333-014-0419-1$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1007/s10333-014-0419-1$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>314,776,780,27903,27904,41467,42536,51297</link.rule.ids></links><search><creatorcontrib>Liu, Haisheng</creatorcontrib><creatorcontrib>Yoshikawa, Natsuki</creatorcontrib><creatorcontrib>Miyazu, Susumu</creatorcontrib><creatorcontrib>Watanabe, Kouhei</creatorcontrib><title>Influence of saltwater wedges on irrigation water near a river estuary</title><title>Paddy and water environment</title><addtitle>Paddy Water Environ</addtitle><description>Paddy fields irrigated using water from the Shinkawa River in Niigata, Japan, are subject to adverse effects associated with the occurrence of saltwater wedges in the river. The extent of saltwater intrusion in the river varies, depending on river discharge and tidal amplitude. In this study, field observations and numerical simulation of the Shinkawa River estuary were applied to ascertain the influence of saltwater wedges on paddy cultivation during the irrigation period. The saltwater wedge was surveyed using an echo-sounding profiling system (SC-3); results indicated that the longitudinal profiles of the saltwater wedge were 4.7 and 2.2 km from the river mouth sluice gate at the high water mark of spring tide and at the low water mark of neap tide, respectively. According to the vertical profiling using electrical conductivity (EC) meters at bridges crossing the river, there was a rigid interface between freshwater and saltwater with a thin halocline zone of approximately 0.25 m. These profiles were well reproduced by the one-dimensional, two-layer, unsteady flow model. The results of the model simulation and EC observation indicate that when the vertical position of the halocline rises to 1.2 m below the inlet of the water intake pumping station, the EC value rises sharply to 1,500 μs/cm, which is an unsuitable level for irrigation water. It is estimated that for about 23 % of the total irrigation period, pump operation is halted as a result of this mechanism.</description><subject>Agriculture</subject><subject>Biomedical and Life Sciences</subject><subject>Brackish</subject><subject>Computer simulation</subject><subject>Echo surveys</subject><subject>Ecotoxicology</subject><subject>Estuaries</subject><subject>Freshwater</subject><subject>Geoecology/Natural Processes</subject><subject>High water mark</subject><subject>Hydrogeology</subject><subject>Hydrology/Water Resources</subject><subject>Irrigation</subject><subject>Irrigation water</subject><subject>Life Sciences</subject><subject>Low water mark</subject><subject>Mouth</subject><subject>Neap tides</subject><subject>Profiling</subject><subject>Pumping stations</subject><subject>Rice</subject><subject>River discharge</subject><subject>River flow</subject><subject>River mouth</subject><subject>Rivers</subject><subject>Saline water</subject><subject>Saline water intrusion</subject><subject>Saline-freshwater interfaces</subject><subject>Seawater</subject><subject>Sluice gates</subject><subject>Soil Science & Conservation</subject><subject>Spring tides</subject><subject>Tidal amplitude</subject><subject>Unsteady flow</subject><subject>Wedges</subject><issn>1611-2490</issn><issn>1611-2504</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2015</creationdate><recordtype>article</recordtype><sourceid>BENPR</sourceid><recordid>eNqNkU1Lw0AQhhdRsFZ_gLeAFy_Rmf1IskcpVgsFL3peNulsSUmTuptY_PdujYIIgnOZGeaZdxhexi4RbhAgvw0IQogUUKYgUad4xCaYIaZcgTz-rqWGU3YWwgaA51LghM0XrWsGaitKOpcE2_R725NP9rRaU0i6Nqm9r9e2r2M5jlqyPrGJr99iQ6EfrH8_ZyfONoEuvvKUvczvn2eP6fLpYTG7W6aVVLxPC1usSi3BWalytaIMdS6VsFVpeSUcIKycAgIHUMhCk-VlSZKXtuIkQBViyq5H3Z3vXod43GzrUFHT2Ja6IRjM8lwXKgP9H1QIHQMjevUL3XSDb-Mjkcq4yAv8FMSRqnwXgidndr7exucNgjmYYEYTTDTBHEwwB2U-7oTItmvyP5T_XPoASm2IZg</recordid><startdate>20150401</startdate><enddate>20150401</enddate><creator>Liu, 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river estuary</title><author>Liu, Haisheng ; Yoshikawa, Natsuki ; Miyazu, Susumu ; Watanabe, Kouhei</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c452t-8a8db940fa4575de6197453acba2c3f010df50e0f008489ea2bbe42bac2e30583</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2015</creationdate><topic>Agriculture</topic><topic>Biomedical and Life Sciences</topic><topic>Brackish</topic><topic>Computer simulation</topic><topic>Echo surveys</topic><topic>Ecotoxicology</topic><topic>Estuaries</topic><topic>Freshwater</topic><topic>Geoecology/Natural Processes</topic><topic>High water mark</topic><topic>Hydrogeology</topic><topic>Hydrology/Water Resources</topic><topic>Irrigation</topic><topic>Irrigation water</topic><topic>Life Sciences</topic><topic>Low water mark</topic><topic>Mouth</topic><topic>Neap tides</topic><topic>Profiling</topic><topic>Pumping stations</topic><topic>Rice</topic><topic>River discharge</topic><topic>River flow</topic><topic>River mouth</topic><topic>Rivers</topic><topic>Saline water</topic><topic>Saline water intrusion</topic><topic>Saline-freshwater interfaces</topic><topic>Seawater</topic><topic>Sluice gates</topic><topic>Soil Science & Conservation</topic><topic>Spring tides</topic><topic>Tidal amplitude</topic><topic>Unsteady flow</topic><topic>Wedges</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Liu, Haisheng</creatorcontrib><creatorcontrib>Yoshikawa, Natsuki</creatorcontrib><creatorcontrib>Miyazu, Susumu</creatorcontrib><creatorcontrib>Watanabe, Kouhei</creatorcontrib><collection>CrossRef</collection><collection>ProQuest Central (Corporate)</collection><collection>Aqualine</collection><collection>Environment Abstracts</collection><collection>Water Resources Abstracts</collection><collection>Agricultural Science Collection</collection><collection>ProQuest Central (purchase pre-March 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Environ</stitle><date>2015-04-01</date><risdate>2015</risdate><volume>13</volume><issue>2</issue><spage>179</spage><epage>189</epage><pages>179-189</pages><issn>1611-2490</issn><eissn>1611-2504</eissn><abstract>Paddy fields irrigated using water from the Shinkawa River in Niigata, Japan, are subject to adverse effects associated with the occurrence of saltwater wedges in the river. The extent of saltwater intrusion in the river varies, depending on river discharge and tidal amplitude. In this study, field observations and numerical simulation of the Shinkawa River estuary were applied to ascertain the influence of saltwater wedges on paddy cultivation during the irrigation period. The saltwater wedge was surveyed using an echo-sounding profiling system (SC-3); results indicated that the longitudinal profiles of the saltwater wedge were 4.7 and 2.2 km from the river mouth sluice gate at the high water mark of spring tide and at the low water mark of neap tide, respectively. According to the vertical profiling using electrical conductivity (EC) meters at bridges crossing the river, there was a rigid interface between freshwater and saltwater with a thin halocline zone of approximately 0.25 m. These profiles were well reproduced by the one-dimensional, two-layer, unsteady flow model. The results of the model simulation and EC observation indicate that when the vertical position of the halocline rises to 1.2 m below the inlet of the water intake pumping station, the EC value rises sharply to 1,500 μs/cm, which is an unsuitable level for irrigation water. It is estimated that for about 23 % of the total irrigation period, pump operation is halted as a result of this mechanism.</abstract><cop>Tokyo</cop><pub>Springer Japan</pub><doi>10.1007/s10333-014-0419-1</doi><tpages>11</tpages></addata></record> |
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| subjects | Agriculture Biomedical and Life Sciences Brackish Computer simulation Echo surveys Ecotoxicology Estuaries Freshwater Geoecology/Natural Processes High water mark Hydrogeology Hydrology/Water Resources Irrigation Irrigation water Life Sciences Low water mark Mouth Neap tides Profiling Pumping stations Rice River discharge River flow River mouth Rivers Saline water Saline water intrusion Saline-freshwater interfaces Seawater Sluice gates Soil Science & Conservation Spring tides Tidal amplitude Unsteady flow Wedges |
| title | Influence of saltwater wedges on irrigation water near a river estuary |
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