{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/99260"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/99260","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Effective Green and Ampt parameters for two layered soils","abstract":"Green-Ampt method is a physically based model for partitioning rainfall into surface runoff and infiltration. This method is widely used in infiltration practice because of its simplicity and the ease of obtaining required hydraulic soil properties. The method assumes that soil is homogeneous, therefore it is difficult to apply to layered soils. In this paper, simple procedures for applying Green-Ampt method to layered soils are examined both under steady and unsteady rain. For a given design storm, the maximum saturated depth of the top layer can be estimated. Because the uppermost layer controls the behavior until the wetting front reaches the boundary of the layers, if the thickness of the top layer is greater than maximum saturated depth, considering only the uppermost layer makes no difference in terms of infiltration process. However, if this is not the case, the bottom layer should be considered. To consider two-layered soils, overall effective Green-Ampt parameters of layered soils are estimated considering different parameters such as rainfall characteristics, the hydraulic properties of both layers, the thickness of the top layer and the maximum saturated depth. Runoff and infiltrated volumes with effective Green-Ampt parameters were compared with MIKE SHE simulation results based on Richards equation for different layer thicknesses, soil properties, and rainfall hyetographs. These results show that the proposed simple and quick procedures for estimating effective soil parameters show good agreement in terms of the volume of runoff and infiltration water. Therefore, this approach will help researchers and engineers to save time and effort dealing with layered soils using Green-Ampt method.","abstract_html":"Green-Ampt method is a physically based model for partitioning rainfall into surface runoff and infiltration. This method is widely used in infiltration practice because of its simplicity and the ease of obtaining required hydraulic soil properties. The method assumes that soil is homogeneous, therefore it is difficult to apply to layered soils. In this paper, simple procedures for applying Green-Ampt method to layered soils are examined both under steady and unsteady rain. For a given design storm, the maximum saturated depth of the top layer can be estimated. Because the uppermost layer controls the behavior until the wetting front reaches the boundary of the layers, if the thickness of the top layer is greater than maximum saturated depth, considering only the uppermost layer makes no difference in terms of infiltration process. However, if this is not the case, the bottom layer should be considered. To consider two-layered soils, overall effective Green-Ampt parameters of layered soils are estimated considering different parameters such as rainfall characteristics, the hydraulic properties of both layers, the thickness of the top layer and the maximum saturated depth. Runoff and infiltrated volumes with effective Green-Ampt parameters were compared with MIKE SHE simulation results based on Richards equation for different layer thicknesses, soil properties, and rainfall hyetographs. These results show that the proposed simple and quick procedures for estimating effective soil parameters show good agreement in terms of the volume of runoff and infiltration water. Therefore, this approach will help researchers and engineers to save time and effort dealing with layered soils using Green-Ampt method.","abstract_has_math":false,"creators":["Lee, Sang-Hyun"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Civil Engineering","degree_department":null,"school":null,"contributors":["Schmidt, Arthur R."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2018,"date_issued":"2018-03-13T15:28:44Z","date_published":"2018-03-13T15:28:44Z","updated_at":"2026-07-22T22:24:37Z","subjects":["Infiltration into layered soils","Effective Green-Ampt parameters"],"languages":["en"],"rights":["Copyright 2017 Sanghyun Lee"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/99260","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Schmidt, Arthur R."]},{"key":"dc:creator","label":"Author","values":["Lee, Sang-Hyun"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2018-03-13T15:28:44Z","2020-03-14T09:15:28Z","2017-12-13","2017-12"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Civil Engineering"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Infiltration into layered soils","Effective Green-Ampt parameters"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2017 Sanghyun Lee"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/99260"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Green-Ampt method is a physically based model for partitioning rainfall into surface runoff and infiltration. This method is widely used in infiltration practice because of its simplicity and the ease of obtaining required hydraulic soil properties. The method assumes that soil is homogeneous, therefore it is difficult to apply to layered soils. In this paper, simple procedures for applying Green-Ampt method to layered soils are examined both under steady and unsteady rain. For a given design storm, the maximum saturated depth of the top layer can be estimated. Because the uppermost layer controls the behavior until the wetting front reaches the boundary of the layers, if the thickness of the top layer is greater than maximum saturated depth, considering only the uppermost layer makes no difference in terms of infiltration process. However, if this is not the case, the bottom layer should be considered. To consider two-layered soils, overall effective Green-Ampt parameters of layered soils are estimated considering different parameters such as rainfall characteristics, the hydraulic properties of both layers, the thickness of the top layer and the maximum saturated depth. Runoff and infiltrated volumes with effective Green-Ampt parameters were compared with MIKE SHE simulation results based on Richards equation for different layer thicknesses, soil properties, and rainfall hyetographs. These results show that the proposed simple and quick procedures for estimating effective soil parameters show good agreement in terms of the volume of runoff and infiltration water. Therefore, this approach will help researchers and engineers to save time and effort dealing with layered soils using Green-Ampt method.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2019-12-01","The student, Sanghyun Lee, accepted the attached license on 2017-12-13 at 10:27.","The student, Sanghyun Lee, submitted this Thesis for approval on 2017-12-13 at 11:16.","This Thesis was approved for publication on 2017-12-13 at 14:32.","DSpace SAF Submission Ingestion Package generated from Vireo submission #11966 on 2018-03-13 at 09:57:49","Made available in DSpace on 2018-03-13T15:28:44Z (GMT). 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This method is widely used in infiltration practice because of its simplicity and the ease of obtaining required hydraulic soil properties. The method assumes that soil is homogeneous, therefore it is difficult to apply to layered soils. In this paper, simple procedures for applying Green-Ampt method to layered soils are examined both under steady and unsteady rain. For a given design storm, the maximum saturated depth of the top layer can be estimated. Because the uppermost layer controls the behavior until the wetting front reaches the boundary of the layers, if the thickness of the top layer is greater than maximum saturated depth, considering only the uppermost layer makes no difference in terms of infiltration process. However, if this is not the case, the bottom layer should be considered. To consider two-layered soils, overall effective Green-Ampt parameters of layered soils are estimated considering different parameters such as rainfall characteristics, the hydraulic properties of both layers, the thickness of the top layer and the maximum saturated depth. Runoff and infiltrated volumes with effective Green-Ampt parameters were compared with MIKE SHE simulation results based on Richards equation for different layer thicknesses, soil properties, and rainfall hyetographs. These results show that the proposed simple and quick procedures for estimating effective soil parameters show good agreement in terms of the volume of runoff and infiltration water. Therefore, this approach will help researchers and engineers to save time and effort dealing with layered soils using Green-Ampt method.","Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2019-12-01","The student, Sanghyun Lee, accepted the attached license on 2017-12-13 at 10:27.","The student, Sanghyun Lee, submitted this Thesis for approval on 2017-12-13 at 11:16.","This Thesis was approved for publication on 2017-12-13 at 14:32.","DSpace SAF Submission Ingestion Package generated from Vireo submission #11966 on 2018-03-13 at 09:57:49","Made available in DSpace on 2018-03-13T15:28:44Z (GMT). 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