Adaptation to urbanization impacts on drainage in the city of Hohhot, China

Abstract

This study presents a quantitative assessment of urbanization effects on hydrological runoff and drainage network in the city of Hohhot, China. The evolution of urban spatial morphology for the historical years (1987-2010) and projected year (2020) is described by changes in geographic information system (GIS)-based land use maps and further represented in hydrological parameters in the Storm Water Management Model (SWMM) simulation. The results show the levels of service of historical drainage were too low to have dominant impacts on flood risks, and hence a significant upward trend in catchment runoff response was observed over time. Comparisons with changes in system overloading indicate that the relative increase in flood risk is greatest at the early stage of urbanization with relatively low levels of development. The proposed adaptation measures based on a cost-effective optimal approach was found feasible to significantly improve the drainage performance and mitigate the increasing flooding impacts.

Impacts of future climate change on urban flood volumes in Hohhot in northern China: benefits of climate change mitigation and adaptations

“…A new drainage system is therefore required to cope with increasing urban flood volumes and frequencies in the future. The planned drainage area for 2020s is about 307.83 km 2 , which is 50 % larger than the current drainage area (Zhou et al, 2016). The land use categories and distribution are shown in Fig.…”

“…The drainage network has a higher pipeline cover rate in the centre, but a rather low design standard for extreme rainfall events with a return period of less than 1 year. Historical records of stormwater drainage and flood damage indicate that the region has experienced an increase in flood frequency and magnitude within the context of climate change and urbanisation (Zhou et al, 2016). During the major flood event on 11 July 2016, the city, especially the western portion of the watershed, was hit by an extreme rainfall event of more than 100 mm of rain in 3 h. The flood event led to the cancellation of at least 8 flights and 17 trains, and delays of several transportation systems.…”

Optimising the combination strategies for pipe and infiltration‐based low impact development measures using a multiobjective evolution approach

“…The category “other” contains municipal facilities, commercial areas, institutions and hospitals. The planned city map for 2020s (Zhou, Ren, Xu, Han, & Wang, ) is shown in Figure b. Note that the current industrial districts will mainly be replaced by residential areas in the near future, which represents an opportunity for LID design to reduce the impervious surfaces in the region.…”

Effects of Urban Non-Point Source Pollution from Baoding City on Baiyangdian Lake, China

“…For the Fuhe River with small ratio of width to depth, pollutants can be mixed in these sections (Jiaozhuang, Wangting, Anzhou, Nanliuzhuang) in a relatively short period of time. A one-dimensional water quality model that can simulate the migration of pollutants along the river longitudinal has been described in [34,35] and is defined as:…”