城市化下沿海小流域水文观测试验与产汇流机制
DOI:
作者:
作者单位:

1.浙江省宁波市鄞州区水利局;2.南京大学地理与海洋科学学院

作者简介:

通讯作者:

中图分类号:

TV11

基金项目:

国家自然科学基金青年基金(42101020),江苏省水利科技项目(2021010), 中国博士后科学基金(2021M691529)


Hydrological experiment and rainfall-runoff characteristics of small watersheds under urbanization in the eastern coastal region, China
Author:
Affiliation:

1.Yinzhou Water Conservancy Bureau,Zhejiang Province;2.China;3.School of Geographic and Oceanographic Sciences,Nanjing University

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    变化环境下暴雨洪涝灾害呈现加剧趋势,但由于水文过程的复杂性以及观测资料的缺乏,探讨变化环境下水文响应机理成为了地理、水文等学科关注的重点与难点问题之一。基于野外综合水文对比观测试验,探讨了不同土地利用/覆被下的水文响应特征及产汇流机制。结果表明:长三角地区长时间序列土壤含水率季节性变化较小,其变化幅度总体表现为表层和汛期较大,而深层和非汛期较小。杨梅林纵剖面土壤含水率总上到下呈现逐渐增加的趋势,而耕地和竹林趋势相反。从表层到深层,山坡地、城镇用地和荒地土壤含水率呈现反S型、W型和V型波动变化趋势。试验流域洪水特征与总降雨量相关性较强,说明蓄满产流是该地区主要产流方式,其洪水特征主要受到流域自然地理特征和降雨的影响。城市化区域不透水面扩张,可能导致降雨下渗减少,径流系数增加,从而导致洪峰水位上升。

    Abstract:

    Under the nowadays changing environment, the disasters of rainstorm flood show increasing trend, however, due to the scarcity of observational data and the complexity of hydrological processes, revealing hydrologic response mechanisms have become one of the key and difficult issues in geography, hydrology, and so on. Based on two closed drainage basins in the Yangtze River Delta, comparative field observation experiments were carried out to explore the hydrological response and the mechanism of runoff generation under different land use/cover conditions. The results show that the seasonal variation of soil moisture content in the long time series due to the humid climate in the Yangtze River Delta region. The deviation coefficient of soil moisture content is larger in surface layer and flood season, but lower in deep layer and non-flood season. The soil moisture content in the longitudinal profile of bayberry forest increased gradually from surface to bottom layer, while the trend was opposite for cultivated land and bamboo forest. From surface to deep layer, soil moisture content of hillslope, urban land and wasteland showed reverse S -, W - and V - shaped fluctuation trend in the longitudinal profile. There is a strong correlation between flood characteristics and total rainfall, with R2 > 0.49 and p < 0.01, indicating the dominant role of runoff generation under saturated condition. Moreover, the flood characteristics are mainly influenced by the physical geographical characteristics and rainfall, while the antecedent conditions have relatively little influence in humid region. The increase of water level and unit rainfall water level in Yinjiang experimental basin with a higher impervious water level ratio were higher than that in Xilongxi experimental basin, which indicates that the expansion of impervious water surface in urbanization area may lead to the decrease of rainfall infiltration and the increase of runoff coefficient, and thus leading to the rise of flood peak.

    参考文献
    相似文献
    引证文献
引用本文
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:2021-11-13
  • 最后修改日期:2021-11-13
  • 录用日期:2022-03-24
  • 在线发布日期:
  • 出版日期: