Rapid Urbanization Impact on the Hydrological Processes in Zhengzhou, China

Abstract

<jats:p>Changes in the hydrological process caused by urbanization lead to frequent flooding in cities. For fast-growing urban areas, the impact of urbanization on the hydrological process needs to be systematically analyzed. This study takes Zhengzhou as an example to analyze the impact of urbanization on the hydrological process based on 1971–2012 hourly rainfall-runoff data, combining Geographic Information Systems with traditional hydrological methods. Our study indicates that the rain island effect in different districts of city became stronger with the increase of its built-up. The uneven land use resulted in the difference of runoff process. The flood peak lag was 25–30% earlier with the change of land use. The change of flood peak increased by 10–30% with the change of built-up. The runoff coefficient increases by 20–35% with the increase of built-up, and its change increased with the change of land use. Affected by the rain island effect, precipitation tends to occur in areas where built-up is dominant, which overall magnifies the impact of urbanization on the hydrological process. This provides new ideas for urban flood control. Refine flood control standards according to regional land use changes to cope with the hydrological process after urbanization.</jats:p>

Evaluation of Land-Use Changes Impact on Watershed Health Using Probabilistic Approaches

“…Land-use changes influence ecosystems by altering water cycles and WQ [38][39][40]. Many studies have confirmed that the land-use change alters regional hydrology [41][42][43], and WQ conditions and cities amplify ecosystem changes in natural watersheds [43][44][45] and urban sprawl impact on the agricultural area [46]. The results of the WH assessment show that its present land use is worse than its natural state in the past (Figure 6).…”

Calculation method of short-duration rainstorm intensity formula considering nonstationarity of rainfall series: impacts on the simulation of urban drainage system

“…The annual average precipitation is between 600 and 700 mm, and the rainfall from June to September accounts for more than 50% of the annual rainfall. The local urban floods occur frequently in recent years, which may be caused by climate change and rapid urbanization (Wang et al 2020). The original fixed rainstorm intensity formula may not be appropriate.…”

Analysis of the Behavior of Abstractions in Two Urban Micro-Basins of the City of Cuenca (Ecuador), through an Aggregate Model

“…Conversely, it has been established that in the permeable areas of urbanized watersheds, uncertainty persists about the role that these areas play in runoff processes [17]. Likewise, when the effects of land-use change are analyzed, this condition has a very significant influence on runoff processes when heavy rains occur [18]. Therefore, these uncertainties can lead to errors in estimating the hydrological response to rain events in urbanized basins, making it necessary to study them.…”