Seasonal and interannual variations of flow discharge from Pearl River into sea

来源 :Water Science and Engineering | 被引量 : 0次 | 上传用户:zhongyuzhang09
下载到本地 , 更方便阅读
声明 : 本文档内容版权归属内容提供方 , 如果您对本文有版权争议 , 可与客服联系进行内容授权或下架
论文部分内容阅读
Flow discharge from the river basin into the sea has severe impacts on the immediate vicinity of river channels, estuaries, and coastal areas. This paper analyzes the features and temporal trends of flow discharge at Pearl River’s three main gauge stations: the Wuzhou, Shijiao, and Boluo gauge stations on the West River, North River, and East River, respectively. The results show no significant trend in annual mean discharge into the sea at the three gauge stations. Changes of monthly mean discharge at the Boluo Gauge Station are evident, and a majority of monthly discharge in the dry season displays significant increasing trends. Furthermore, changes of the extreme discharge are quite evident, with a significant decreasing trend in the annual maximum discharge and a significant increasing trend in the minimum one. The significantly decreasing ratio of the flood discharge to annual discharge at the Boluo Gauge Station indicates that the flow discharge from the East River has increased in the dry season and decreased in the flood season since the construction of dams and reservoirs. At the other two gauge stations, the Wuzhou and Shijiao gauge stations, the seasonal discharge generally does not change perceptibly. Human impacts, especially those pertaining to reservoir and dam construction, appear to be responsible for the seasonal variation of flow discharge. The results indicate that the construction and operation of dams and reservoirs in the East River have a greater influence on flow discharge, which can well explain why the seasonal variation of flow discharge from the East River is more evident. Flow discharge from the river basin into the sea has severe impacts on the immediate vicinity of river channels, estuaries, and coastal areas. This paper analyzes the features and temporal trends of flow discharge at Pearl River’s three main gauge stations: the Wuzhou, Shijiao, and Boluo gauge stations on the West River, North River, and East River, respectively. The results show no significant trend in annual mean discharge into the sea at the three gauge stations. Changes of monthly mean discharge at the Boluo Gauge Station are evident, and a majority of monthly season displays significant significant trends, with a significant decreasing trend in the annual maximum discharge and a significant increasing trend in the minimum one. The significant decreasing ratio of the flood discharge to annual discharge at the Boluo Gauge Station indicates that the flow discharge from the East River has increased the dry season and decreased in the flood season since the construction of dams and reservoirs. At the other two gauge stations, the Wuzhou and Shijiao gauge stations, the seasonal discharge generally does not change perceptibly. Human impacts, especially those pertaining to reservoir and dam construction, appear to be responsible for the seasonal variation of flow discharge. The results indicate that the construction and operation of dams and reservoirs in the East River have a greater influence on flow discharge, which can well explain why the seasonal variation of flow discharge from the East River is more evident.
其他文献
社会经济的发展对学生听说能力的要求越来越高。本文着重阐述了影响听力学习的几个主要因素,并结合具体情况提出了一些对策,旨在探讨如何全面提高学生的英语水平,增强学生的
经济全球化要求艺术设计要保持共性化原则及简练、简洁,市场竞争又使得设计必须要有自己的个性特征.传统艺术是体现个性的最好素材,因此我们要运用传统艺术元素来充分张扬个
当今,教育观念和教育手段都在发生着前所未有的变化,尤其是教育手段的变化使得传统教育正在面临着根本性变革.发展远程教育,构建终生学习体系作为其中的一项重要的内容.本文
语言是文化的载体,也是文化的组成部分.在外语教学中,不仅应重视语言教学,也应重视文化教学.该文从外语教学中存在的问题出发,探讨了外语教学中文化与外语教学的关系及如何培
本文以隐喻和转喻作为研究重点,从横组合与纵聚合的区别切入,研究二者之间的相同与不同.并把这两组对照落实到文学欣赏和研究上以及英语教学的探讨中.
跨文化交际能力是语言交际能力的重要组成部分,培养学生的跨文化交际能力是大学英语教学的重要任务。通过对语言与文化的关系和跨文化交际含义的阐述,探讨了在大学英语教学中
随着计算机技术的快速发展,计算机辅助教学已经走入课堂,其效果也得到了许多教师的认可。导入,是课堂教学的第一环节,也是引导学生进入学习状态的一个关键环节。本文从教学实
跨文化教学的重要性已是众所周知,然而在实际的大学英语教学活动中,跨文化教学并没有引起高度重视,没有充分开展。本文立足于跨文化教学在现今大学英语教学活动中的现状,分析
阅读教学既是中学英语教学的重点,也是教学上的难点。整体教学是一种现代教学方法,阅读的整体教学值得英语教师在教学过程中尝试。 Reading teaching is not only the focal
2月28号,由广东省茂名市电白冠利达科技生物养殖有限公司(以下简称“冠利达”)主办的“工厂化高效生态系统及产业园区规划研讨会”在茂名海景湾维景国际大酒店隆重举行。农业部