Figure 2 - available via license: Creative Commons Attribution 4.0 International
Content may be subject to copyright.
Source publication
Land use changes alter the hydrological characteristics
of the land surface, and have significant impacts on hydrological cycle and
water balance, the analysis of complex effects on natural systems has become
one of the main concerns. In this study, we generated the land use
conversion matrixes using ArcGIS and selected several landscape indexes
(c...
Context in source publication
Context 1
... hydrological and meteorological data in Dujiangyan Sta- tion were used in this study to analyze annual trend of pre- cipitation and runoff during 1959-2008. The results were shown in Fig. 2. The precipitation was overall decreased by 1.9 mm per year; meanwhile, the annual mean flow was also showed a decreasing trend, with average decreasing speed of 1.5 m 3 s −1 per year, and the annual runoff volume de- creased at a rate of 47.5 × 10 6 m 3 per year. The changes in precipitation and runoff were nearly synchronous, because precipitation is the main factor to constitute runoff. There- fore, based on the precipitation and runoff data from 1959 to 2008, we established statistical equations (Table 4) for pre- cipitation and runoff during the period 1959-2008, 19851995 and 1996-2008 through regression analysis, respec- tively. These equations represent the relationship between rainfall and runoff under different land use impacts. The R 2 of regression equation at each period were larger than 0.6, indicating the close relationship between runoff and Table 4. Statistical regression analysis and statistical models for runoff and precipitation in different ...
Similar publications
Runoff and sediment yield modeling is important in the watershed to alleviate soil erosion and reservoir sedimentation. This paper presents runoff and sediment yield modeling of Kesem dam watershed, which has a drainage area of 2660 km². Soil and Water Assessment Tool (SWAT, version 2009) integrated with ArcGIS software (version 9.3) was used to si...
Citations
... Land use and cover change (LUCC) is not only the most obvious indicator of human activity and the transformation of nature, but it is also one of the main driving factors of regional and global ecological hydrology change. Its effects, combined with other environmental factors, directly or indirectly impact the hydrological cycle of the world's basins [1]. Land-use changes have transformed the nature of the surfaces underlying watersheds, dramatically impacting the distribution of water resources both temporally and geographically, and causing a series of ecological and environmental problems [2][3][4]. ...
To study the response of runoff to extreme changes in land use, the Soil and Water Assessment Tool (SWAT) model was used to construct historical, extreme, and future scenarios for several major landscape types in a permafrost region of northeastern China. The results show that the SWAT model is applicable in the Tahe River Basin; forestlands, shrublands, wetlands, and grasslands are the main land-use types in this basin, and the transfers among them from 1980–2015 have impacted runoff by less than 5%. Under extreme land use-change scenarios, the simulated runoff decreased from grasslands, to wetlands, shrublands, and finally, forestlands. The conversion of extreme land-use scenarios produces different hydrological effects. When forestland is converted to grassland, runoff increases by 25.32%, when forestland is converted to wetland, runoff increases by 13.34%, and the conversion of shrubland to forestland reduces runoff by 13.25%. In addition, the sensitivity of runoff to different land-use changes was much greater during flood seasons than in dry seasons. Compared to the reference year of 2015, the annual simulated runoff under the two future land-use scenarios (shrublands to forestlands and shrublands to wetland) was less. Also, both future land-use scenarios showed effects to decrease flooding and increased dryness, This study provided important insight into the integrated management of land use and water resources in the Tahe River Basin and the permafrost region of northeastern China.
... Both SHAPE_MN and FRAC_MN describe the compactness of patch shapes and/or the geometric complexity. These two indices decreased from 1994 to 2007 for most classes, indicating that the shape of land use become simpler (Ma et al., 2018) to 2.58 with CV of 0.15 in 2007 (Fig. 3(e)). The decreases in variation from 1994 to 2007 indicate that the urban planning was applied in the watersheds, and the shapes of TRAN and HYDR became simpler. ...
Change in water quality is seen as a reflection of change in terrestrial and aquatic ecosystems that are degraded by anthropogenic activities, including inappropriate land use management, deforestation, and urbanization. As the inter-correlations among landscape structure and ecological process have great influences on the hydrological process, energy flow, and nutrient cycles, it is important to evaluate the impact of landscape configuration on water quality for individual basins. Spatio-temporal variations of water quality and correlations among land use/land cover and water quality across Taiwan have not been thoroughly investigated. In this study, 48 water quality stations within 10 basins across Taiwan are investigated to identify the relationships among various water quality indices, land use/land cover, and landscape metrics at two different time periods. A total of 12 water quality parameters are included: water temperature, pH value, electrical conductivity, dissolved oxygen, biological oxygen demand, chemical oxygen demand, total suspended sediment, total phosphorus, ammonia, nitrate, nitrite, and total nitrogen. Two years (1994 and 2007) of land use/land cover were characterized by using landscape metrics to quantify change in landscape configuration. The hypothesis is that individual basin has different characteristics resulting in different water quality – landscape metric relationships. The results showed that high degrees of landscape fragmentation and interspersion are correlated with degradation of water quality, in terms of high biological and chemical oxygen demands, and nitrogen loads, and such significant relationships are found in certain land use types as pollution sources. Only 3 out of 10 basins have strong or moderate impacts of landscape variation on water quality, indicating these findings could provide reference for developing an effective watershed planning and management with further investigations of landscape configuration at the class level.
... The humaninduced LULC change, especially through the development of croplands and built-up lands considerably affects hydrological processes (Hibbert 1967;Bosch & Hewlett 1982) and enhances runoff generation (Garg et al. 2018). The conversion of LULC usually has an unintended consequence on the natural environment (Regmi et al. 2017;Jaiswal & Amin 2020), especially in the form of enhanced runoff and soil erosion (Guzhaet et al. 2018;Ma et al. 2018;Messele & Moti 2019). Several studies conducted to envisage the role of LULC pattern on hydrological processes since the mid of the last century (Dwarakish & Ganasri 2015;Zhang et al. 2016) and many empirical and mathematical models developed for estimating hydrological processes, especially the surface runoff (Hjelmfelt 1991;Mishra & Singh 2003;Uwizeyimana et al. 2018;Matomela et al. 2019). ...
Alteration of land-use land cover pattern causes severe consequences on the hydrological system by modifying the rainfall-runoff pattern in a region. The study aimed to investigate the impact of land-use land-cover dynamics on runoff generation in different geomorphic divisions of Panchnoi River basin. The study used the Soil Conservation Service-Curve Number method to estimate runoff generation in the Panchnoi River basin in a GIS platform. This study observed that the conversion of the land-use pattern in the geomorphic zones significantly enhances runoff. The Piedmont experience highest land-use change, where 64.17 km ² forest cover lost to cropland and built-up lands, leads to a notable increase in runoff generation, i.e. from 1 076 mm (52.82% of rainfall) in 1990 to 1 467 mm (70.46% of rainfall) in 2015. The Flood plain and New alluvial plain generates high runoff in the basin as it mostly occupied by human-induced land-uses, i.e. 1 444 mm (72.72% of rainfall) and 1 360 mm (71.70% of rainfall) respectively in 1990, which increase to 1588 mm (79.20%) and 1507 mm (78.69%) runoff respectively in 2015, due to alteration of cropland to built-up lands. In the Old alluvial plain, a marginal land-use change observed resulted in moderate growth in runoff from 1 272 mm (62.35%) to 1 404 mm (66.79%). The study indicates land-use land-cover change invokes to increase runoff generation can give rise severe environmental and economic problems in the river basin, through the occurrence of flashflood and soil erosion.
Highlights for public administration, management and planning: • Evaluation of the impact of land-use land cover dynamics on runoff is essential for containing flash flood and water resource management on a basin scale.
• Alteration of natural land covers has severe implications in the form of flood, soil erosion, and loss of biodiversity.
• Enhanced runoff due to land-use dynamics reduces groundwater recharge rate that may cause drinking water scarcity in the dry season shortly.
