Monitoring Land Use/Cover Changes by Using Multi-Temporal Remote Sensing for Urban Hydrological Assessment: A Case Study in Beijing, China

Abstract

Understanding the change in hydrological response due to urban dynamics is important for better flood preparedness and future sustainable urban planning. This study investigated the influence of urban land cover change on spatiotemporal changes in flood peak discharge and flood volume within a rapidly urbanizing catchment located in Beijing, China. We used Landsat satellite data ranging from 1986 to 2017 to monitor and quantify urban growth. Moreover, the Hydrological Modeling System (HEC-HMS) coupled with meteorological data was utilized to examine the impact of urban growth on hydrological responses. The results revealed that major changes in land use/cover (LULC) were detected in the urban landscape, which increased from 25.22% to 65.48% of the total catchment area, while agricultural land decreased from 64.85% to 25.28% during 1986–2017. The flood peak discharge and flood volume average of the three rainstorms events reached 7.02% and 11.93%, respectively. Furthermore, the changes in flood peak discharge and flood volume were more obvious at the sub-catchment scale. These findings indicate that urban growth enhanced the possible flooding risk in the study catchment. This study improves the understanding of the isolated impacts of urbanization on flooding and provides essential information for sustainable urban planning.

Ecological effect of urban spatial expansion in river valleys: A case study in the main urban area of Lanzhou City

“…长期以来人口持续向城市集聚 [1,2] ， 使城市空间持 续扩张， 农业和生态用地不断向城市用地转变 [3] ， 迫使 城市生态环境承受着巨大压力 [4] ， 往往也伴随着生 境退化、 生态系统服务价值损失等一系列生态环境 安全问题 [5,6] ， 严重制约人类社会经济可持续发展进 程 [7] 。可见， 城市空间扩张与区域生态环境保护之间 存在冲突， 这一问题对生态敏感、 地形复杂的干旱半 干旱河谷城市而言， 尤为明显 [8] 。因此， 在资源和生 态环境约束日益加大的形势下， 研究河谷城市扩展 所引起的生态效应对推动区域经济、 社会、 生态的 可持续发展至关重要。 目前学界对城市空间扩展的相关研究主要集 中在城市扩展的过程 [9] 、 模式 [10] 、 动力机制 [11] 、 模拟预 测以及城市扩展效应与调控等 5 个方面 [12,13] ， 且主要 研究对象为平原城市 [14] ， 对干旱区河谷盆地型城市 的影响 [15] 、 城市空间扩展对生态环境的影响评价 [16] 、 城市空间扩展引起生态环境质量变化的驱动因素 辨析以及城市空间扩展的生态效应模拟预测与调 控等方面 [17][18][19] 。综合来看， 近年来城市空间扩展过 程及其所伴随的生态问题研究引起国内外学者广泛 关注 [20][21][22] ， 但对城市空间扩展的生态效应研究主要侧 重于城市空间扩展对气候 [23] 、 水文 [24] 、 温度 [25] 、 水资源 以及土壤资源等单个生态要素或资源的影响 [26,27] 丘陵的制约 [28] 。兰州市处于典型的河谷盆地， 其过 去快速的工业化和城市化使人口、 产业迅速集中在 河谷滩地， 造成河谷盆地内土地资源及其匮乏， 以 及填河造地等非自然、 不合理的开发方式， 导致城 市水体、 湿地大幅减少， 脆弱的生态环境进一步恶 化 [29] 。干旱区河谷城市发展与生态环境保护之间的 矛盾愈加凸显 [30] 景观格局特征 [34,35] 。城市扩展特征指标的具体公式 和描述见表 1。…”

Impact of Urbanization on Regional Rainfall-Runoff Processes: Case Study in Jinan City, China

“…Land cover, a fundamental parameter for environmental and ecological modeling, is crucial for the study of water balance, carbon cycle, food security and resource management [9][10][11]. Although satellite remote sensing and the Google Earth Engine have promoted powerful land cover monitoring to obtain pixel-wise image aggregations, the high-resolution continuous land cover data have seldom been explored in the existing research [12][13][14].…”

Spatial-temporal Changes of Land Use/Cover and Its Impact on Evapotranspiration in Wuwei City

“…Land resources are the foundation of human survival and social development, and are one of the most precious natural resources for humanity. Land Use and Cover Change (LUCC) is an important carrier for human activities to transform the natural surface, and is the basis for studying global climate change and ecological environment issues such as carbon cycle, biodiversity, agricultural development [2][3][4]. Therefore, strengthening the research on the spatiotemporal dynamic changes and driving mechanisms of land use is of great significance for maintaining the balance between the natural environment and the human social system, and improving the regional ecological environment [5][6].…”