Evaluating the influence of spatial resolutions of DEM on watershed runoff and sediment yield using SWAT

Reddy, A. Siva; Reddy, M. Janga

doi:10.1007/s12040-015-0617-2

Cited by 41 publications

(8 citation statements)

References 28 publications

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“…Moreover, the minimum altitudes increase and the maximum altitudes decrease as the DEM resolution decrease (coarser). These results are consistent with the finding of Reddy et al, (2015) [27] and Mou et al, (2015) [19]. Results of applying the LC/LU of 30, 300, 500, and 1000 m in SWAT hydrologic model for Adhaim watershed, Table 4, show that there is no considerable relationship between the resolution of the LC/LU layer and the number of classes.…”

Section: Resultssupporting

confidence: 91%

Effect of DEM and Land Cover Resolutions on Simulated Runoff of Adhaim Watershed by SWAT Model

Al-Khafaji¹,

Saeed²

2018

ETJ

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Accurate estimation of surface runoff by using Soil and Water Assessment Tool (SWAT) model is highly depends on the accuracy of the Digital Elevation Model (DEM), Land Cove and Land Use (LC/LU), soil and weather data as input variables. The interactive and complementary effects of the DEM and LC/LU resolutions on the estimated runoff were not taken into consideration in previous studies. This research aims to study these effects on the accuracy of runoff estimation of Adhaim Watershed by using SWAT Model. Twenty surface runoff estimation SWAT models of Adhaim Watershed were implemented using five DEMs with spatial resolution of 30, 50, 90, 250 and 1000m in conjunction with four LC/LUs with spatial resolution of 30, 300, 500 and 1000 m. These models were calibrated and verified on daily time step with the adoption of maximizing Nash and Sutcliffe Efficiency (NS) as an objective function. The results of SWAT models show that specifying the watershed boundary and the total area is highly affected by the DEM resolution without considerable trend. Also, the estimated minimum altitude is inversely related to the DEM resolution, whereas the maximum altitude has a direct relationship. Furthermore, LC/LU resolution is highly affected the number and area of classes that can be distinguished in the LC/LU image. Although, the number of hydrologic response units (HRUs) depends on LC/LU resolution, it was found that this number increases with the increase in LC/LU resolution to a maximum number of HRUs and then it gradually decreases. Whereas, the HRUs has a direct relationship with the DEM resolution and the number of subbasins irregularly changed with the increase of DEM resolution. Results of runoff estimation by using SWAT models show that the estimated runoff is not directly or inversely related to the DEM and LC/LU resolutions. Moreover, the most accurate runoff was not estimated with the highest DEM and LC/LU resolutions, where it is obtained with DEM and LC/LU resolutions of 250 m and 1000 m respectively with NS of 0.74. Accordingly, it is recommended to use these resolutions for estimating the surface runoff of Adhaim Watershed. The relationship between the HRUs and estimated runoff is very complex therefore; more extensive studies are required to comprehend this relationship.

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Section: Resultssupporting

confidence: 91%

Effect of DEM and Land Cover Resolutions on Simulated Runoff of Adhaim Watershed by SWAT Model

Al-Khafaji¹,

Saeed²

2018

ETJ

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“…The major input geospatial data used for the SWAT simulation included: (1) a 1:1,000,000 China Soil Map; (2) land-use maps (1: 25,000) for the 1980s and 2000; (3) a 90 m Digital Elevation Model (DEM); (4) daily climate data of 1969-2012 from 11 meteorological stations and 25 rain gauges ( Supplementary Table S2). These geospatial datasets of different resolutions were converted to a common resolution raster of 90 m using the Resample Tool in ArcGIS 9.3 software package [30,31]. Monthly observed runoff data for years 1969-2012 at the Zhangjiafen stream-gauging station in the Bai River and Xiahui stream-gauging station in the Chao River, respectively, were also collected.…”

Section: Datasets Used In This Studymentioning

confidence: 99%

SWAT-Simulated Streamflow Responses to Climate Variability and Human Activities in the Miyun Reservoir Basin by Considering Streamflow Components

Yan

Bai

Yi³

et al. 2018

Sustainability

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The streamflow into Miyun Reservoir, the only surface drinking water source for Beijing City, has declined dramatically over the past five decades. Thus, the impacts of climate variability and human activities (direct and indirect human activities) on streamflow and its components (baseflow and quickflow) needs to be quantitatively estimated for the sustainability of regional water resources management. Based on a heuristic segmentation algorithm, the chosen study period (1969–2012) was segmented into three subseries: a baseline period (1969–1979) and two impact periods I (1980–1998) and II (1999–2012). The Soil and Water Assessment Tool (SWAT) was adopted to investigate the attributions for streamflow change. Our results indicated that the baseflow accounted for almost 63.5% of the annual streamflow based on baseflow separation. The contributions of climate variability and human activities to streamflow decrease varied with different stages. During impact period I, human activities was accountable for 54.3% of the streamflow decrease. In impact period II, climate variability was responsible for 64.9%, and about 8.3 mm of baseflow was extracted from the stream on average based on the comparison of the observed streamflow and simulated baseflow. The results in this study could provide necessary information for water resources management in the watershed.

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“…Zhang et al (2014) considered the Xiangxi River as the study area to assess the impact of DEM spatial resolution on the accuracy of the SWAT model results at 17 DEM spatial resolutions ranging from 30 to 1000 m, concluding that the DEM resolution essentially does not affect the streamflow. Reddy and Reddy (2015) found out that NHRUs, subbasin areas, reach slopes and reach lengths varied substantially because of DEM resolutions. Furthermore, with decreasing DEM resolution, the minimum altitude increases and the maximum altitude decreases.…”

Section: Introductionmentioning

confidence: 99%

The Interactive Impact of Land Cover and DEM Resolution on the Accuracy of Computed Streamflow Using the SWAT Model

Al-Khafaji

Saeed

Al‐Ansari

2020

Water Air Soil Pollut

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Twenty daily time step-based SWAT simulation models for the Duhok, Adhaim and Dokan dam watersheds, in Iraq, were implemented using five land cover (LC) and digital elevation model (DEM) of different resolutions. The optimal LC and DEM for computing the most accurate streamflow for each watershed were specified. Results indicated that delineation of the flat watersheds is significantly affected by the DEM resolution and there was no evident trend on the computation of watersheds' total areas, boundaries, number of subbasins and stream networks. Moreover, there is no significant trend between the increase in LC and DEM resolutions and accuracy of the computed streamflow. The most accurate streamflows for the Duhok, Adhaim and Dokan watersheds were computed using LC (DEM) of 30 m, 1000 m and 1000 m.

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Evaluating the influence of spatial resolutions of DEM on watershed runoff and sediment yield using SWAT

Cited by 41 publications

References 28 publications

Effect of DEM and Land Cover Resolutions on Simulated Runoff of Adhaim Watershed by SWAT Model

Effect of DEM and Land Cover Resolutions on Simulated Runoff of Adhaim Watershed by SWAT Model

SWAT-Simulated Streamflow Responses to Climate Variability and Human Activities in the Miyun Reservoir Basin by Considering Streamflow Components

The Interactive Impact of Land Cover and DEM Resolution on the Accuracy of Computed Streamflow Using the SWAT Model

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