{"title":"瓜迪亚纳河口(伊比利亚半岛西南部)悬浮颗粒物质的分布与构成","authors":"A. Machado, F. Rocha, C. Gomes, J. Dias","doi":"10.2112/jcr-si50-188.1","DOIUrl":null,"url":null,"abstract":"MACHADO, A., ROCHA, F., GOMES, C. and DIAS, A., 2007. Distribution and Composition of Suspended Particulate Matter in Guadiana Estuary (Southwestern Iberian Peninsula). Journal of Coastal Research, SI 50 (Proceedings of the 9th International Coastal Symposium), 1040 – 1045. Gold Coast, Australia, ISSN 0749.0208 The construction of the Alqueva Dam may have a significant impact on the suspended sediment concentration (SSC) of the Guadiana River, its estuary and coastal zone. Suspended particulate matter (SPM) was collected along the Guadiana Estuary at distinct river flow and tidal conditions. 84 samples of SPM were collected during low and high spring tides, in November 2000 and February 2001, respectively. During November 2000, in lowrunoff conditions, the mean SSC value was 32.45 mg/l and the highest values were found at 20-30 km, upstream of the river mouth. However, after short periods of heavy rain, the SSC increased in the water column and the highest values (501.6 mg/l) were found near the river mouth. In what concerns the mineralogical composition, the main minerals in SPM are phyllosilicates, quartz, plagioclases. Illite, kaolinite, chlorite, smectite and irregular illite-smectite mixed-layers are the main clay minerals. In low-runoff, the increment of quartz and illite concentrations seems to be associated to the entrance of saline water in the estuary and, consequently, to floodtide flows. Kaolinite relatively to illite, exhibits an opposite behavior, indicating that its source is largely continental. The total contents of phyllosilicates and, particularly, chlorite enrichment during the flood-situation seems to be associated to low-tide flows being exported to the adjacent shelf. This study confirms the importance of energetic events, in transferring particles to deeper domains, while during low runoff the main trend is the import from the adjacent ocean.","PeriodicalId":51078,"journal":{"name":"Journal of Coastal Research","volume":"13 11","pages":""},"PeriodicalIF":0.0000,"publicationDate":"2024-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"14","resultStr":"{\"title\":\"Distribution and Composition of Suspended Particulate Matter in Guadiana Estuary (Southwestern Iberian Peninsula)\",\"authors\":\"A. Machado, F. Rocha, C. Gomes, J. Dias\",\"doi\":\"10.2112/jcr-si50-188.1\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"MACHADO, A., ROCHA, F., GOMES, C. and DIAS, A., 2007. Distribution and Composition of Suspended Particulate Matter in Guadiana Estuary (Southwestern Iberian Peninsula). Journal of Coastal Research, SI 50 (Proceedings of the 9th International Coastal Symposium), 1040 – 1045. Gold Coast, Australia, ISSN 0749.0208 The construction of the Alqueva Dam may have a significant impact on the suspended sediment concentration (SSC) of the Guadiana River, its estuary and coastal zone. Suspended particulate matter (SPM) was collected along the Guadiana Estuary at distinct river flow and tidal conditions. 84 samples of SPM were collected during low and high spring tides, in November 2000 and February 2001, respectively. During November 2000, in lowrunoff conditions, the mean SSC value was 32.45 mg/l and the highest values were found at 20-30 km, upstream of the river mouth. However, after short periods of heavy rain, the SSC increased in the water column and the highest values (501.6 mg/l) were found near the river mouth. In what concerns the mineralogical composition, the main minerals in SPM are phyllosilicates, quartz, plagioclases. Illite, kaolinite, chlorite, smectite and irregular illite-smectite mixed-layers are the main clay minerals. In low-runoff, the increment of quartz and illite concentrations seems to be associated to the entrance of saline water in the estuary and, consequently, to floodtide flows. Kaolinite relatively to illite, exhibits an opposite behavior, indicating that its source is largely continental. The total contents of phyllosilicates and, particularly, chlorite enrichment during the flood-situation seems to be associated to low-tide flows being exported to the adjacent shelf. This study confirms the importance of energetic events, in transferring particles to deeper domains, while during low runoff the main trend is the import from the adjacent ocean.\",\"PeriodicalId\":51078,\"journal\":{\"name\":\"Journal of Coastal Research\",\"volume\":\"13 11\",\"pages\":\"\"},\"PeriodicalIF\":0.0000,\"publicationDate\":\"2024-03-29\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"14\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Journal of Coastal Research\",\"FirstCategoryId\":\"89\",\"ListUrlMain\":\"https://doi.org/10.2112/jcr-si50-188.1\",\"RegionNum\":4,\"RegionCategory\":\"地球科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q3\",\"JCRName\":\"Earth and Planetary Sciences\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Coastal Research","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.2112/jcr-si50-188.1","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"Earth and Planetary Sciences","Score":null,"Total":0}
引用次数: 14
摘要
MACHADO, A., ROCHA, F., GOMES, C. and DIAS, A., 2007.Guadiana 河口(伊比利亚半岛西南部)悬浮颗粒物质的分布与构成。Journal of Coastal Research, SI 50 (Proceedings of the 9th International Coastal Symposium), 1040 - 1045.澳大利亚黄金海岸,ISSN 0749.0208 阿尔克瓦大坝的建设可能会对瓜迪亚纳河及其河口和海岸带的悬浮沉积物浓度 (SSC)产生重大影响。在不同的河流流量和潮汐条件下,沿瓜迪亚纳河口采集了悬浮颗粒物 (SPM)。分别在 2000 年 11 月和 2001 年 2 月的春潮低潮期和高潮期采集了 84 个 SPM 样本。2000 年 11 月,在径流量较小的情况下,平均 SSC 值为 32.45 毫克/升,最高值出现在河口上游 20-30 公里处。然而,短时间的暴雨过后,水体中的 SSC 值上升,最高值(501.6 毫克/升)出现在河口附近。在矿物成分方面,SPM 中的主要矿物为植硅酸盐、石英、斜长石。伊利石、高岭石、绿泥石、直闪石和不规则的伊利石-直闪石混合层是主要的粘土矿物。在径流量较小的情况下,石英和伊利石浓度的增加似乎与河口盐水的进入有关,因此也与洪潮的流动有关。相对于伊利石而言,高岭石的表现恰恰相反,表明其主要来源于大陆。植硅体的总含量,尤其是绿泥石在洪水情况下的富集,似乎与向邻近大陆架输出的低潮流有关。这项研究证实了高能事件在将颗粒转移到更深领域方面的重要性,而在低径流期间,主要趋势是从邻近海洋进口。
Distribution and Composition of Suspended Particulate Matter in Guadiana Estuary (Southwestern Iberian Peninsula)
MACHADO, A., ROCHA, F., GOMES, C. and DIAS, A., 2007. Distribution and Composition of Suspended Particulate Matter in Guadiana Estuary (Southwestern Iberian Peninsula). Journal of Coastal Research, SI 50 (Proceedings of the 9th International Coastal Symposium), 1040 – 1045. Gold Coast, Australia, ISSN 0749.0208 The construction of the Alqueva Dam may have a significant impact on the suspended sediment concentration (SSC) of the Guadiana River, its estuary and coastal zone. Suspended particulate matter (SPM) was collected along the Guadiana Estuary at distinct river flow and tidal conditions. 84 samples of SPM were collected during low and high spring tides, in November 2000 and February 2001, respectively. During November 2000, in lowrunoff conditions, the mean SSC value was 32.45 mg/l and the highest values were found at 20-30 km, upstream of the river mouth. However, after short periods of heavy rain, the SSC increased in the water column and the highest values (501.6 mg/l) were found near the river mouth. In what concerns the mineralogical composition, the main minerals in SPM are phyllosilicates, quartz, plagioclases. Illite, kaolinite, chlorite, smectite and irregular illite-smectite mixed-layers are the main clay minerals. In low-runoff, the increment of quartz and illite concentrations seems to be associated to the entrance of saline water in the estuary and, consequently, to floodtide flows. Kaolinite relatively to illite, exhibits an opposite behavior, indicating that its source is largely continental. The total contents of phyllosilicates and, particularly, chlorite enrichment during the flood-situation seems to be associated to low-tide flows being exported to the adjacent shelf. This study confirms the importance of energetic events, in transferring particles to deeper domains, while during low runoff the main trend is the import from the adjacent ocean.
期刊介绍:
The Journal of Coastal Research (JCR) is one of the leading international journals for coastal studies and processes, and is published bi-monthly by the Coastal Education & Research Foundation [CERF]. By covering the entire field of coastal research, the JCR encompasses all subjects relevant to natural and engineered environments (freshwater, brackish, or marine) and the protection/management of their resources in the vicinity of coastlines of the world. Even though the journal broadly focuses on immediate shoreline zones, the JCR also embraces those coastal environments that either reach some indefinite distance inland or that extend seaward beyond the outer margins of the sublittoral (neritic) zone. The JCR disseminates accurate information to both the public and research specialists around the world on all aspects of coastal issues in an effort to maintain or improve the quality of our planet''s shoreline resources.