The study of water resources at watershed scale is widely adopted as approach to manage, assess and simulate these important natural resources. The development of remote sensing and GIS techniques has allowed the use ...The study of water resources at watershed scale is widely adopted as approach to manage, assess and simulate these important natural resources. The development of remote sensing and GIS techniques has allowed the use of spatially and physically based hydrologic models to simulate as simply and realistically as possible the functioning of watershed systems. Indeed, the major constraint that has hindered the expansion use of these tools was the unavailability or scarcity of data especially in the developing countries. In this context, the objective of this study is to model the hydrology in the Bouregreg basin, located at the north-central of Morocco, using the Soil and Water Assessment Tool (SWAT) in order to understand and determine the different watershed hydrological processes. Thus, it aims to simulate the stream flow, establish the water balance and estimate the monthly volume inflow to SMBA dam situated at the basin outlet. The ArcSWAT interface implemented in the ArcGIS software was used to delineate the basin and its sub-components, combine the data layers and edit the model database. The model parameters were analyzed, ranked and adjusted for hydrologic modeling purposes using daily temporal data series. They were calibrated using an auto-calibration method based on a Shuffled Complex Evolution Algorithm from 1989 to 1997 and validated from 1998 to 2005. Based on statistical indicators, the evaluation indicates that SWAT model had a good performance for both calibration and validation periods in Bouregreg Watershed. In fact, the model showed a good correlation between the observed and simulated monthly average river discharge with R2 and Nash coefficient of about 0.8. The water balance components were correctly estimated and the SMBA dam inflow was successfully reproduced with R2 of 0.9. These results revealed that if properly calibrated, SWAT model can be used efficiently in semi-arid regions to support water management policies.展开更多
Water is undoubtedly the most vital natural resource. Water use management is one of the greatest challenges that face humanity. The demand for water is continuously growing because of the population growth, the inten...Water is undoubtedly the most vital natural resource. Water use management is one of the greatest challenges that face humanity. The demand for water is continuously growing because of the population growth, the intensive urbanization and the development of industrial and agricultural activities. To face the increasing pressure on this vital resource, it is so necessary to set up the adequate instruments to ensure a rational and efficient management of this resource. In this context, the hydrological modeling is largely used as an instrument to assess the functioning of these resources at watershed scale. In addition, the use of spatial models let to depict and simulate the watershed processes at small spatial and heterogeneous scales that reflect the field reality more accurate and more realistic as possible. However, the use of spatial models requires geospatial data that must be gathered at very fine scales. The aim of this study is to highlight the contribution of geospatial data to assess the hydrologic modeling of watershed by using a spatial hydro-agricultural model, notably the SWAT model (Soil and water Assessment Tool). The study area is the Basin of Low Oum Er Rbiaa River which extends from the Al Massira dam to its outlet in the Atlantic Ocean. This watershed includes a set of dams (Daourat, Imfout and Sidi Maachou) built in waterfall fashion along the river. The objective was to simulate the hydrological functioning of this area that had never been modeled in order to assess the management of these reservoirs used essentially to produce electricity and fresh water. The implementation of the SWAT model required a spatial database that was built from topography, soil, land use and climate data. The calibration and validation of the model was carried out on a daily basis over several years (2001-2010) using The ArcSWAT tool integrated in ArcGIS software and the Parasol optimization method. The calibration of SWAT model was successfully done with 0.6 as value of Nash coefficient used commonly in hydrolog展开更多
洪水灾害的发生会危害人们的生命和财产安全,对于洪水的研究一直以来被广泛重视,研究方法也在不断创新。本文根据SWAT(Soil and Water Assessment Tool)模型结合地理信息系统(Geographic Information System,简称GIS)以ArcSWAT工具为主...洪水灾害的发生会危害人们的生命和财产安全,对于洪水的研究一直以来被广泛重视,研究方法也在不断创新。本文根据SWAT(Soil and Water Assessment Tool)模型结合地理信息系统(Geographic Information System,简称GIS)以ArcSWAT工具为主从子流域、河道、水文响应单元三个方面模拟2019年、2020年的7、8、9三个月珲春河流域水文特征并且取六个月时间的均值进行分析,为洪水灾害研究提供参考数据。展开更多
Understanding urban wetland ecosystem services structure allows managers to base restoration efforts on multiple user end-benefits.Ary Creek can provide the coupled function of improving water quality and mitigating f...Understanding urban wetland ecosystem services structure allows managers to base restoration efforts on multiple user end-benefits.Ary Creek can provide the coupled function of improving water quality and mitigating floods through delayed stormwater flow.It is fundamental to identify areas surrounded by water for the safety of individual should in case the water level raise beyond a reasonable doubt and might cause a flood.For many years,the Ary Creek catchment in Inverloch has been flooding and causing great problems for the inhabitants as well as the environment.The procedure is to develop models of the area around the catchment or watershed using Victorian Coastal LiDAR and other input data from the GIS(geographic information system).This study uses the real-time simulation in ArcSWAT—ArcGIS 10.3 and 3D in ArcScene 10.3,and the variables obtained from the soil and water assessment tool ArcSWAT such as the land use,soil and slope are the parameters measured to induce the flood.When certain portions of the Hydrologic response unit HRU,land use,soil or slope is changed due to temporal adjustment and climate change,then the model can predict zones of low,moderate and high flood risk.The 3D simulations appear to produce a visual model for decision-making,planning,management,and mitigation.The simulation helps in determining the extent of the flood by using animation.展开更多
广东开平大沙河水库为开平市主要供水源,其入库河流都受到不同程度的污染,水库呈富营养化状态需控制外源营养盐的输入。为了探究SWAT(Soil and Water Assessment Tool)模型在亚热带地区的适用性,为流域污染管理提供参考,运用ArcSWAT200...广东开平大沙河水库为开平市主要供水源,其入库河流都受到不同程度的污染,水库呈富营养化状态需控制外源营养盐的输入。为了探究SWAT(Soil and Water Assessment Tool)模型在亚热带地区的适用性,为流域污染管理提供参考,运用ArcSWAT2009对大沙河水库流域进行了径流模拟和评价研究。用LH-OAT方法进行参数敏感性分析,找出对径流模拟影响较大的15个参数,采用2003—2012年的水库总入流数据对模型进行率定和验证。结果表明,LH-OAT敏感性分析方法可准确地找出模型的敏感参数;将时间尺度分别为日和月的率定和验证结果进行比较,月模拟效果明显较好,其与实测数据的相关系数R2分别为0.884和0.911,纳什系数(NSE)分别为0.879和0.907;模型的自动率定SCE-UA方法在大沙河水库流域的水量模拟中较适用,值得进一步研究应用,为水质水量管理工作提供参考。展开更多
文摘The study of water resources at watershed scale is widely adopted as approach to manage, assess and simulate these important natural resources. The development of remote sensing and GIS techniques has allowed the use of spatially and physically based hydrologic models to simulate as simply and realistically as possible the functioning of watershed systems. Indeed, the major constraint that has hindered the expansion use of these tools was the unavailability or scarcity of data especially in the developing countries. In this context, the objective of this study is to model the hydrology in the Bouregreg basin, located at the north-central of Morocco, using the Soil and Water Assessment Tool (SWAT) in order to understand and determine the different watershed hydrological processes. Thus, it aims to simulate the stream flow, establish the water balance and estimate the monthly volume inflow to SMBA dam situated at the basin outlet. The ArcSWAT interface implemented in the ArcGIS software was used to delineate the basin and its sub-components, combine the data layers and edit the model database. The model parameters were analyzed, ranked and adjusted for hydrologic modeling purposes using daily temporal data series. They were calibrated using an auto-calibration method based on a Shuffled Complex Evolution Algorithm from 1989 to 1997 and validated from 1998 to 2005. Based on statistical indicators, the evaluation indicates that SWAT model had a good performance for both calibration and validation periods in Bouregreg Watershed. In fact, the model showed a good correlation between the observed and simulated monthly average river discharge with R2 and Nash coefficient of about 0.8. The water balance components were correctly estimated and the SMBA dam inflow was successfully reproduced with R2 of 0.9. These results revealed that if properly calibrated, SWAT model can be used efficiently in semi-arid regions to support water management policies.
文摘Water is undoubtedly the most vital natural resource. Water use management is one of the greatest challenges that face humanity. The demand for water is continuously growing because of the population growth, the intensive urbanization and the development of industrial and agricultural activities. To face the increasing pressure on this vital resource, it is so necessary to set up the adequate instruments to ensure a rational and efficient management of this resource. In this context, the hydrological modeling is largely used as an instrument to assess the functioning of these resources at watershed scale. In addition, the use of spatial models let to depict and simulate the watershed processes at small spatial and heterogeneous scales that reflect the field reality more accurate and more realistic as possible. However, the use of spatial models requires geospatial data that must be gathered at very fine scales. The aim of this study is to highlight the contribution of geospatial data to assess the hydrologic modeling of watershed by using a spatial hydro-agricultural model, notably the SWAT model (Soil and water Assessment Tool). The study area is the Basin of Low Oum Er Rbiaa River which extends from the Al Massira dam to its outlet in the Atlantic Ocean. This watershed includes a set of dams (Daourat, Imfout and Sidi Maachou) built in waterfall fashion along the river. The objective was to simulate the hydrological functioning of this area that had never been modeled in order to assess the management of these reservoirs used essentially to produce electricity and fresh water. The implementation of the SWAT model required a spatial database that was built from topography, soil, land use and climate data. The calibration and validation of the model was carried out on a daily basis over several years (2001-2010) using The ArcSWAT tool integrated in ArcGIS software and the Parasol optimization method. The calibration of SWAT model was successfully done with 0.6 as value of Nash coefficient used commonly in hydrolog
文摘洪水灾害的发生会危害人们的生命和财产安全,对于洪水的研究一直以来被广泛重视,研究方法也在不断创新。本文根据SWAT(Soil and Water Assessment Tool)模型结合地理信息系统(Geographic Information System,简称GIS)以ArcSWAT工具为主从子流域、河道、水文响应单元三个方面模拟2019年、2020年的7、8、9三个月珲春河流域水文特征并且取六个月时间的均值进行分析,为洪水灾害研究提供参考数据。
文摘Understanding urban wetland ecosystem services structure allows managers to base restoration efforts on multiple user end-benefits.Ary Creek can provide the coupled function of improving water quality and mitigating floods through delayed stormwater flow.It is fundamental to identify areas surrounded by water for the safety of individual should in case the water level raise beyond a reasonable doubt and might cause a flood.For many years,the Ary Creek catchment in Inverloch has been flooding and causing great problems for the inhabitants as well as the environment.The procedure is to develop models of the area around the catchment or watershed using Victorian Coastal LiDAR and other input data from the GIS(geographic information system).This study uses the real-time simulation in ArcSWAT—ArcGIS 10.3 and 3D in ArcScene 10.3,and the variables obtained from the soil and water assessment tool ArcSWAT such as the land use,soil and slope are the parameters measured to induce the flood.When certain portions of the Hydrologic response unit HRU,land use,soil or slope is changed due to temporal adjustment and climate change,then the model can predict zones of low,moderate and high flood risk.The 3D simulations appear to produce a visual model for decision-making,planning,management,and mitigation.The simulation helps in determining the extent of the flood by using animation.
文摘广东开平大沙河水库为开平市主要供水源,其入库河流都受到不同程度的污染,水库呈富营养化状态需控制外源营养盐的输入。为了探究SWAT(Soil and Water Assessment Tool)模型在亚热带地区的适用性,为流域污染管理提供参考,运用ArcSWAT2009对大沙河水库流域进行了径流模拟和评价研究。用LH-OAT方法进行参数敏感性分析,找出对径流模拟影响较大的15个参数,采用2003—2012年的水库总入流数据对模型进行率定和验证。结果表明,LH-OAT敏感性分析方法可准确地找出模型的敏感参数;将时间尺度分别为日和月的率定和验证结果进行比较,月模拟效果明显较好,其与实测数据的相关系数R2分别为0.884和0.911,纳什系数(NSE)分别为0.879和0.907;模型的自动率定SCE-UA方法在大沙河水库流域的水量模拟中较适用,值得进一步研究应用,为水质水量管理工作提供参考。
