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Frontiers of Earth Science

ISSN 2095-0195

ISSN 2095-0209(Online)

CN 11-5982/P

Postal Subscription Code 80-963

2018 Impact Factor: 1.205

Front Earth Sci    0, Vol. Issue () : 207-216    https://doi.org/10.1007/s11707-011-0168-z
RESEARCH ARTICLE
Sediment yield assessment by EPM and PSIAC models using GIS data in semi-arid region
Ali Bagherzadeh1(), Mohammad Reza Mansouri Daneshvar2
1. Department of Agriculture, Islamic Azad University-Mashhad Branch, Mashhad 91735-413, Iran; 2. Department of Geography, Islamic Azad University-Mashhad Branch, Mashhad 91735-413, Iran
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Abstract

Among land degradation processes, soil erosion is the most serious threat to soil and water conservation in semi-arid regions. At the present study, the sedimentation hazard and the erosion zonation were investigated at Kardeh watershed, north-east of Iran by Erosion Potential Method (EPM) and Pacific Sonth-west Inter Agency Committee (PSIAC) models, in combination with the geographical information system (GIS) data, satellite data and field observations. According to our investigation the study area can be categorized into heavy, moderate and slight erosion zones with the total sediment yield of 147859 and 148078 m3/a estimated by EPM and PSIAC models, respectively. The sub-basins located at the middle and south parts of the watershed are highly eroded due to the geology formation and soil erodibility conditions, while the sub-basins at the north parts are moderately eroded because of the intensive land cover. The amounts of the sediment yield in most areas are found to be consistent between the EPM and PSIAC models (R2 = 0.95). Our data suggest the applicability of both empirical models in evaluating the sediment yield in arid and semi-arid watersheds.

Keywords erosion      Erosion Potential Method (EPM) model      Pacific Sonth-west Inter Agency Committee (PSIAC) model      geographical information system (GIS)      sediment yield     
Corresponding Author(s): Bagherzadeh Ali,Email:abagher_ch@yahoo.com   
Issue Date: 05 June 2011
 Cite this article:   
Ali Bagherzadeh,Mohammad Reza Mansouri Daneshvar. Sediment yield assessment by EPM and PSIAC models using GIS data in semi-arid region[J]. Front Earth Sci, 0, (): 207-216.
 URL:  
https://academic.hep.com.cn/fesci/EN/10.1007/s11707-011-0168-z
https://academic.hep.com.cn/fesci/EN/Y0/V/I/207
Sub-basin (abbr.)Length /kmArea/km2Physiographic unitAverage slope gradient /%Annual temperature /°CAnnual precipitation /mm
Balghur (Bl)22.2193.09Mounts5.2810354.7
Kharkat (Kh)22.6897.39Mounts5.299374.4
Karimabad (Kr)19.0169.16Mounts6.269.5367.3
Kushkabad (Ku)22.0791.30Mounts4.0812311.7
Sijoal (Sj)27.31146.47Mounts4.7611325.3
Mareshk (Ma)12.0144.49Mounts6.0010.5341.5
Firuzabad (Fr)6.767.08Hills7.6912.5279.4
Dam Surrounding area (Su)3.976.92Hills6.5512.5279.4
Tab.1  Characteristics of sub-basins at the study area
Fig.1  Location and geographical position of the study area
Fig.2  The satellite image including the sub-basins of the study area
No.FactorsRanking value
1Geology0-10
2Soils0-10
3Climate0-10
4Runoff0-10
5Topography0-20
6Land cove-10-10
7Land use-10-10
8Upland erosion0-25
9Channel erosion0-25
Tab.2  Effective factors on the erosion and the sediment yield and their ranking values in PSIAC model
Geological formationSymbolMain lithologyy-coefficientΨ- coefficientX1- factorX8- factor
KashafrudJksSandstone, shale, siltstone1.200.55816
Mozduran1Jmz1Alternation of limestone and shale1.150.50715
Mozduran2Jmz2Limestone thick bedded, dolomite1.000.45510
ShurijehKshGypsum, brown marl, siltstone1.250.60818
NeogeneNgcConglomerate, sandy marl, mudstone1.600.651022
Tab.3  The EPM and PSIAC coefficients derived from geological formations including rock and soil resistance to the erosion (-coefficient), observed erosion processes (-coefficient), the susceptibility of surface geology to weathering and erosion (X-factor) and upland erosion (X-factor)
Soil typeTexturey- coefficientX2-factorX4-factor
Calcaric Regosols, Lithic leptosolsLoam, sandy loam1.0052
Calcaric Regosols, Haplic calcisolsLoam, sandy clay loam1.2086
Tab.4  The evaluated coefficient of rock and soil resistance to the erosion (- coefficient) used in EPM model and soil types (X-factor) and runoff (X-factor) coefficient used in the PSIAC model
Land use/coverXa-coefficientX6-factorX7-factor
Residential area0.6088
Compact pasture land0.55-10-5
Semi-compact pasture land0.30-80
Scattered pasture land0.6505
Rock0.5010-8
Semi-compact wood land0.50-80
Scattered wood land0.5525
Irrigated farming and garden0.7002
Farm land0.4554
Tab.5  The land use coefficient (X) used in the EPM model, and the land cover (X-factor) and land use (X-factor) coefficients applied in the PSIAC model
Slope classSlope gradient/%Mean/%IX5-Psiac
1Less than 15%7.50.078
2More than 15%350.3518
Tab.6  Slope classes and the assigned ‘-factor’ for each map class used in the EPM model, and ‘X-PSIAC’ used in the PSIAC model
Fig.3  The geology amp, soil type's distribution, elevation and slope gradient of the study area
Fig.4  Isohypse, isotherm, land use/cover, channels and streams maps of the study area
Rainfall/mmHX3-PSIAC
Less than 300287.55
300-325312.56
325-350337.56
350-375362.57
375-400387.57
400-425412.58
More than 425437.58
Tab.7  Rainfall classes and evaluated ‘H’ and ‘X-factor’ used in the EPM and PSIAC models, respectively
ErosionZR
ClassCategoryRanking valueMean value of basinRanking valueMean value of basin
5SevereZ>1.00100-150
4Heavy0.71<Z<1.0075-100
3Moderate0.41<Z<0.7050-7553.13
2Slight0.20<Z<0.400. 3825-50
1Very SlightZ<0.190-25
Tab.8  The EPM erosion coefficient and the PSIAC total ranking values R of the nine factors for the study area
Temperature/°CT
≤90.95
9-111.05
11-131.14
≥131.22
Tab.9  Mean annual temperature intervals and the calculated ‘T’ parameter used in the EPM model
Sediment yield after the EPM and PSIAC modelsErosion classSub basinsArea /km2Percentage from total basin area
Wsp/(m3·km-2·a-1)x>275HeavyKh-Kr- Ku-Ma302.3354.39
225<x≤275ModerateSj-Fr-Su160.4728.87
x≤225SlightBl93.0916.75
Qs /(m3·km-2·a-1)x>275HeavyKu-Sj-Ma282.2650.78
225<x≤275ModerateBl-Kh-Kr259.6346.71
x≤225SlightFr-Su14.002.52
Tab.10  The estimated sediment yield ( and ), the area and the percentage of each erosion class from total basin area calculated after the EPM and PSIAC models, respectively
Fig.5  Annual specific production of sediment () derived from the EPM model and the rate of sediment yield () derived from the PSIAC model
ModelBlKhKrKuSjMaFrSuTotal
EPM18827278001953226362390301292117481640147859
PSIAC23064224971597627907417421408214211390148078
Tab.11  Total sediment production at each sub-basin after EPM and PSIAC models/(m·a)
Statistical analyzeTotal sediment production (PSIAC model)
Total sediment production (EPM model)Pearson Correlation (R)0.97**
R20.95
Sig. (2-tailed)0.00
Tab.12  Correlation between EPM and PSIAC models on total sediment production in eight sub-basins of the study area
Fig.6  Percentage of total sediment production in the PSIAC and EPM models at Kardeh sub-basins
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