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Conservative solute transport from soil to runoff flow in a steep slope area
Nguyen N.A.T.a, Sudjono P.a, Kusuma G.T.a, Gunawan A.Y.a, Muntalif B.S.a
a Department of Environmental Engineering, Faculty of Civil and Environmental, Bandung Institute of Technology, Bandung, 40132, Indonesia
[vc_row][vc_column][vc_row_inner][vc_column_inner][vc_separator css=”.vc_custom_1624529070653{padding-top: 30px !important;padding-bottom: 30px !important;}”][/vc_column_inner][/vc_row_inner][vc_row_inner layout=”boxed”][vc_column_inner width=”3/4″ css=”.vc_custom_1624695412187{border-right-width: 1px !important;border-right-color: #dddddd !important;border-right-style: solid !important;border-radius: 1px !important;}”][vc_empty_space][megatron_heading title=”Abstract” size=”size-sm” text_align=”text-left”][vc_column_text]© IJTech 2018.Solute transport through soil is the major source of nonpoint pollution. Overland flow development in a steep slope area is a complex and nonlinear system that can be influenced by infiltration excess, saturation excess, and subsurface flow. Variations in rainfall intensity, slope, and land cover can also affect the soil moisture dynamics leading to overland flow formation. This study aims to define the dominant mechanism of runoff generation in a steep slope area. A computational model is developed to estimate the quantities of runoff flow and salinity concentration in soil layers at different depths. For this purpose, field research was conducted with several rainfall heights and land cover types in an area of 57 m2 with average slope of 46.7%. Field experiments indicated that the surface and subsurface flows in a soil depth of up to 30 cm were not dominant mechanisms in clay soil with steep slope even under high rainfall intensity. The output of the flow quantitative model showed that overland flow generation in the field plot was dominated by the saturation excess mechanism. The natural grass plot showed the lowest overland flow percentage; by contrast, removed grass and without grass plots showed percentages of 19.49% and 19.18% for rainfall height of 24.9 and 21.8 mm, respectively. Land cover was identified as an important factor affecting runoff generation. The output of the solute transport model for rainfall height of 24.9 mm with salt addition indicated that natural grass and removed grass plots had the lowest salinity concentrations of 55.45 and 33.62 ppm, respectively. Salinity transport was slowest on the natural grass plot, and it started only 45-50 min after artificial rain was applied.[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Author keywords” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Indexed keywords” size=”size-sm” text_align=”text-left”][vc_column_text]Overland flow,Rainfall intensity,Soil characteristics,Solute transport,Steep slope area[/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”Funding details” size=”size-sm” text_align=”text-left”][vc_column_text][/vc_column_text][vc_empty_space][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][vc_empty_space][megatron_heading title=”DOI” size=”size-sm” text_align=”text-left”][vc_column_text]https://doi.org/10.14716/ijtech.v9i7.2458[/vc_column_text][/vc_column_inner][vc_column_inner width=”1/4″][vc_column_text]Widget Plumx[/vc_column_text][/vc_column_inner][/vc_row_inner][/vc_column][/vc_row][vc_row][vc_column][vc_separator css=”.vc_custom_1624528584150{padding-top: 25px !important;padding-bottom: 25px !important;}”][/vc_column][/vc_row]