Hydrological response in a highly urbanized watershed in China
Hydrological response in a highly urbanized watershed in China
复制标题
中国高度城市化流域的水文响应
DOI：
10.2166/wcc.2022.041
复制
发表时间：
2021-04
影响因子：
2.8
通讯作者：
Yichen Wang
中科院分区：
文献类型：
--
作者：
Meifang Ren;Gabriele Villarini;Bo Pang;Zongxue Xu;Longgang Du;Yichen Wang
摘要。城市化对水文循环具有强烈的影响，导致入渗减少，径流更快、更大。然而，对城市化对不同分位数排放量的贡献的详细分析仍然缺乏；特别是在像中国这样经历了大规模和快速城市化的流域，人们所知的就更少了。本文以位于北京都市圈的快速城市化流域——文玉流域为研究对象。利用统计归因框架，我们研究了从低流量到高流量的大范围流量分位数对日益增长的城市化的水文响应；此外，我们在季节尺度上进行分析，以捕捉在一年中发挥作用的物理过程的差异。结果表明，所选择的GAMLSS（广义位置、尺度和形状加性模型）模型能较好地反映该高度城市化流域的流量变化，春、夏、冬季观测值与拟合模型中位数的平均Spearman相关系数分别为0.84、0.79和0.81。总体而言，城市化对不同季节和流量分位数的影响不同。更具体地说，我们发现其影响最大的是在冬季和春季，以及低分位数和中位数。降水的作用在夏季最强，且随着流量分布的上尾增大，特别是在第55百分位以上，降水被选为唯一重要的预测因子。另一方面，循环水在冬季和春季往往发挥更大的作用。城市化对水文循环具有强烈的影响；然而，在经历如此大规模和快速城市化的流域，人们所知甚少。本研究以一个快速城市化的流域为研究对象，分析了该流域对城市化进程的水文响应。对不同排放分位数和季节的驱动因素影响进行了量化研究。
Abstract. Urbanization has a strong signal on the hydrologic cycle, leading to reduced infiltration and faster and larger runoff. However, the detailed analysis of the contribution of urbanization to different quantiles of discharge is still lacking; particularly, less is known in watersheds that have been experiencing such large and rapid urbanization as those in China. Here, we focus on the Wenyu watershed, a fast urbanizing basin located in the Beijing metropolitan area. Using a statistical attribution framework, we examine the hydrological response to the increasing urbanization across a wide range of discharge quantiles, from low to high flows; moreover, we perform analyses at the seasonal scale to capture differences in the physical processes at play during the year. Results indicate that the selected GAMLSS (generalized additive models for location, scale, and shape) models can capture well the variability in streamflow in this highly urbanized basin, with the average Spearman correlation coefficients between observations and the median of the fitted models of 0.84, 0.79, and 0.81 in spring, summer, and winter, respectively. Overall, urbanization played a different role for the different seasons and discharge quantiles. More specifically, we find its strongest impact to be in winter and spring, and for low and median quantiles. The role of precipitation is the strongest in summer, and it increases as we move toward the upper tail of the discharge distribution, especially above the 55th percentile, for which precipitation is selected as the only important predictor. Recycled water, on the other hand, tends to play a more dominant role in winter and spring.. HIGHLIGHTS Urbanization has a strong signal on the hydrologic cycle; however, less is known in watersheds that have been experiencing such large and rapid urbanization. In this research, we focus on a fast urbanizing basin, and the hydrological responses to the increasing urbanization have been examined. The quantification of the impacts of drivers for different discharge quantiles and seasons has been examined.