Impact of Land Use on Frequency of Floods in Yongding River Basin, China

Abstract

Abstract:As the debates surrounding the negative influences of flood control using dams or reservoirs on the eco-environment become fierce, non-structural flood control measures like land use change gain more attention. This study researched the effect of integrated and single land use changes on three floods at small, medium and large scales, respectively, in Yongding River basin. A SWAT (Soil and Water Assessment Tool) model was used to simulate the effect of integrated and single land use changes on floods of different scales. The single land uses were set as S1, S2, S3 to represent the agricultural, grass and construction land changes. The results showed that: (1) the integrated land use changes reduced the small flood, the medium flood and the large flood by 14%, 13% and 5%; (2) the land use management functioned most effectively on medium-scale floods and least effectively on large-scale floods; (3) S1 decreased the medium floods optimally by 24% with a 7-day maximum runoff volume as the indicator and by 29% with a 1-day maximum flood discharge; (4) S2 reduced the medium floods optimally by 21% with runoff depth volume as the indicator; (5) S3 increased the medium floods optimally by 15% with a 1-day maximum flood discharge as the indicator.

Impact of Urban Growth and Changes in Land Use on River Flood Hazard in Villahermosa, Tabasco (Mexico)

“…Results show that, even in the most favorable scenario, flooding levels could increase by up to 0.3 m. In the worst scenario, inundation levels could rise by up to 0.7 m in areas already affected by floods every year. As stated by Zhang et al [33], urban/construction land will always increase the problem of flooding. In the case of Villahermosa, which is a center for business and administration for Mexico's oil industry, as well as the connection between Mexico City and the largest cities in the southeast of the country, urban land increase will be a growing problem in years to come.…”

Influence of Changes of Catchment Permeability and Frequency of Rainfall on Critical Storm Duration in an Urbanized Catchment—A Case Study, Cracow, Poland

“…Overall, the larger volume of runoff and the higher efficiency of water conveyance through artificially straightened channels can lead to wider stream channels, as well as to increasingly frequent and severe floods [41,42]. When a large-scale flood occurs, the rainfall intensity is greater than the infiltration rate, which causes more surface runoff [43]. For cities such as Cracow, this is of significant concern as increased flooding may occur without adequate interventions that address increases in runoff volume and reduced time of concentration.…”

“…For cities such as Cracow, this is of significant concern as increased flooding may occur without adequate interventions that address increases in runoff volume and reduced time of concentration. rainfall intensity is greater than the infiltration rate, which causes more surface runoff [43]. For cities such as Cracow, this is of significant concern as increased flooding may occur without adequate interventions that address increases in runoff volume and reduced time of concentration.…”

Model of Climate and Land-Use Changes Impact on Water Security in Ambon City, Indonesia

“…Conversion of land in the catchment area has led to increased runoff index of each watershed, as well as the rapidly increasing flow concentration time. Change of water system in the watershed, causing a phenomenon with negative impact for community such as intensity of floods and droughts has exacerbated (Chen & Yu, 2015;Memarian, Tajbakhsh, & Balasundram, 2013;Pervez & Henebry, 2015;Schilling et al, 2014;Zhang et al, 2016), as is the case today in the Ambon City (Putuhena, 2013).…”