Impacts of inland water area changes on the local climate of Wuhan, China

Zhou, Xuefan; Ooka, Ryozo; Chen, Hong; Kawamoto, Yoichi; Kikumoto, Hideki

doi:10.1177/1420326x14546774

Cited by 18 publications

(4 citation statements)

References 25 publications

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“…From the very beginning of the use of the lake, its area began to be constantly transformed into agricultural land and land for construction. Excessive development has led to a reduction of the water body area of Nan Lake, the disappearance of several of its water system tributaries, and the gradual weakening of its connection with the Yangtze River [38], which has further led to the occurrence of urban flooding and the deterioration of the microclimate of the surrounding area [39]. As shown in Figure 2, due to the rapid development of urban construction, the area of Nan Lake has been gradually reduced, resulting in a corresponding reduction in the area of the waterfront.…”

Section: Study Area and Scopingmentioning

confidence: 99%

Research on Microclimate-Suitable Spatial Patterns of Waterfront Settlements in Summer: A Case Study of the Nan Lake Area in Wuhan, China

Gao,

Zhang,

Wang

et al. 2023

Sustainability

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As China’s urbanization progresses, thermal environmental problems such as the overheating effect experienced by cities are becoming more and more obvious in the daily lives of residents. Urban waterfront spaces not only create pleasant landscape environments and regulate microclimates, but also help to maintain ecological diversity. However, the current high-density urban construction model has led to poor air mobility and weakened water regulation functions in cities. Therefore, the rationalization of the spatial form of settlements has become particularly important in recent times. In this study, the Nan Lake area of Wuhan City was taken as the research object, and it was simulated using ENVI-met (5.5.1) software. Further, the orthogonal experimental design method was combined with the extremum difference analysis method. This study focused on the effects of the layout form (LF), floor area ratio (FAR), green form (GF), and offshore distance (OD) on the temperature (T), relative humidity (RH), and thermal comfort in waterfront settlements in summer. This study found that (1) among the various factors, the effect of the GFs and LFs on the overall microclimate of the study region was the most significant, while the volume ratio had the least significant effect on each indicator. (2) The parallel layout form was found to have better ventilation effects compared to the other three layout forms, with its cooling and humidifying effects being superior. (3) Among the four types of greening combinations, the combination of “grass + shrubs” had the best cooling effect at the height of pedestrians, while trees were able to reduce the heat transfer of solar radiation to the ground due to the shading and evaporation effects provided by their canopies. (4) The cooling and humidifying effects provided by the water body of Nan Lake gradually diminished as the distance from its shore increased; therefore, waterfront settlements maintaining a reasonable proximity to their water bodies will help bring into play the microclimate adjustment effect of such bodies. This study provides a valuable reference for the construction and renewal of urban waterfront settlements in the hot summer and cold winter zones of China (HSCW).

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Section: Study Area and Scopingmentioning

confidence: 99%

Research on Microclimate-Suitable Spatial Patterns of Waterfront Settlements in Summer: A Case Study of the Nan Lake Area in Wuhan, China

Gao,

Zhang,

Wang

et al. 2023

Sustainability

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“…Proximity to open water could affect wind patterns and air temperatures, hence altering the UHII (Zhou et al 2016). The small river Cerezuelo proved to be of great influence in Mediterranean Cazorla, reaching > 4°C cooling in summer TN compared to the centre, but this phenomenon is substantially less important in temperate Geisenheim and boreal Haparanda.…”

Section: Village Uhismentioning

confidence: 99%

Determination of the urban heat island intensity in villages and its connection to land cover in three European climate zones

Dienst¹,

Lindén²,

Esper³

2018

Clim. Res.

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Although urban heat islands (UHIs) have been found in many cities throughout the world, work on smaller settlements is still limited, especially concerning variations connected to climate zones. Meteorological stations are often regarded as rural when located in a village or small town, and any temperature bias is assumed negligible. In this paper, we therefore present air temperature variations and their connection to land cover in 3 European villages, boreal Haparanda, temperate Geisenheim, and Mediterranean Cazorla, all of them hosting long temperature records that might be biased. The villages were equipped with temperature sensors, and the surrounding areas were digitized to compare UHI effects and to evaluate the contribution of land cover on local cooling and warming. This sensor network reveals significant village UHIs in all 3 climate zones, with seasonal maximum intensities decreasing from north (1.4°C) to south (0.9°C). During summer, urban warming is most emphasized in minimum temperatures in boreal Haparanda and temperate Geisenheim but weakest in Mediterranean Cazorla, presumably because of limited plant transpiration due to high insolation and drought stress. Urban warming is correlated with building density in all 3 settlements and shows little seasonal variation. Even though the mountain river passing Cazorla substantially cools ambient temperatures at distances <100 m, mitigation of warming through water bodies is limited in the Central and Northern European sites. Our results suggest to treat rural instrumental station data with care and to avoid using data recorded in villages as unbiased reference records to adjust measurements from larger cities.

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“…The presence of water bodies may reduce daytime temperature but raise nighttime temperature, which is called the thermostatic effect (Oke, 1987; Theeuwes et al., 2013). Although previous mesoscale studies highlighted the importance of water bodies in modifying urban climate, these studies were either focused on urban expansion near or around a lake (e.g., Sharma et al., 2016; Su et al., 2021; Xing et al., 2019), or focused merely on lake changes within an indicated urban area (e.g., Theeuwes et al., 2013; Zhou et al., 2016). That is, the coupling relationship between urban expansion and lake changes in a complex physiographic background (i.e., land‐water mosaics), and the combined impacts of urban expansion and lake changes on regional climate remained understudied.…”

Section: Introductionmentioning

confidence: 99%

Understanding the Impact of Urban Expansion and Lake Shrinkage on Summer Climate and Human Thermal Comfort in a Land‐Water Mosaic Area

et al. 2022

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Wuhan has witnessed unprecedented urban expansion that encroached upon sizable inland lakes. However, the impacts of urban expansion on climate and heat stress for such a city with complex physiographic background (land‐water mosaics) remain understudied. Using a coupled urban‐lake‐atmospheric model, we first examined summer climate responses to urban expansion and lake shrinkage in Wuhan during 2000–2020. Second, multiple heat stress indicators were used to evaluate human thermal comfort in different contexts of interest. Results showed that the presence of water bodies reduced daytime maximum temperature, raised nighttime minimum temperature, and increased moisture content in urban and built‐up areas. Urban expansion alone led to summer warming of 0.9°C and drying of 0.9 g/kg, with local peak warming and drying up to 2°C and 1.4 g/kg. In comparison, urban expansion with lake shrinkage showed a reduced magnitude of warming of 0.8°C and increased magnitude of drying of 1.6 g/kg, with the maximum changes up to 1.4°C and 2.0 g/kg. The presence of water bodies reduced while urban expansion increased the frequency of occurrence of yellow and orange heat alert days; however, both increased the number of days exerting high thermal risks on outdoor workers and those days that were dangerous for outdoor pedestrians. Our study underlined that both urban expansion and water body existence exerted a strong influence on summer climate and heat stress in Wuhan, and highlighted that mitigation measures should be taken to alleviate the deleterious impacts of high temperature and humidity on human health.

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Impacts of inland water area changes on the local climate of Wuhan, China

Cited by 18 publications

References 25 publications

Research on Microclimate-Suitable Spatial Patterns of Waterfront Settlements in Summer: A Case Study of the Nan Lake Area in Wuhan, China

Research on Microclimate-Suitable Spatial Patterns of Waterfront Settlements in Summer: A Case Study of the Nan Lake Area in Wuhan, China

Determination of the urban heat island intensity in villages and its connection to land cover in three European climate zones

Understanding the Impact of Urban Expansion and Lake Shrinkage on Summer Climate and Human Thermal Comfort in a Land‐Water Mosaic Area

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