scholarly journals Geospatial Analysis of Wetland Land Use/Land Cover Dynamics On Lake Abaya-Chamo, Southern Rift-Valley of Ethiopia.

2021 ◽  
Author(s):  
Tariku Zekarias ◽  
Vanum Govindu ◽  
Yechale Kebede ◽  
Abren Gelaw
Keyword(s):  
Land Use ◽  
Agricultural Land ◽  
Legal Framework ◽  
Anthropogenic Factors ◽  
Southern Ethiopia ◽  
Land Use Land Cover ◽  
Land Cover Dynamics ◽  
Change Matrix ◽  
The Government ◽  
The Impact

Abstract Background: Wetlands worldwide and in Ethiopia have long been subject to severe degradation due to anthropogenic factors. This study was aimed at analyzing the impact of land use/cover dynamics on Lake Abaya-Chamo wetland in 1990 – 2019. Data were acquired via Landsat TM of 1990, ETM+ of 2000, and OLI of 2010 and 2019 images plus using interview. Supervised classifications (via ERDAS14 and ArcGIS10.5) were applied to detect land use/cover classes. Change matrix model and Kappa coefficients were used for analysis of the land use/cover dynamics in the lake-wetland.Result: It was found that forest; water, shrub land, agricultural land, settlement and swamp area were the main land use/cover classes. Wetland/swamp area has continuously declined throughout 1990 – 2000, 2000 – 2010 and 2010 – 2019 where its magnitude of shrinkage in the respective periods was 11.4 % (700 ha), 16 % (867 ha) and 31.3 % (1,424 ha). While ‘settlement’ and ‘water body’ of the lake-wetland increased at progressively increasing magnitudes of changes in three periods within 1990 – 2019, ‘shrub land’ and ‘swamp’ declined at progressively increasing magnitudes of loss in the same periods Siltation, rapid population growth-led expansion of settlement and irrigation-based farming were the main drivers of the land use/cover dynamics and degradation of the lake-wetland. Conclusion: Thus, consistent mapping and integrated actions should be taken to curb the threats on the sustainability of the lake-wetland in Southern Ethiopia. To curb the impact of LULC dynamics on wetlands, the government should: formulate clear policy, institutional and legal framework on the management of wetlands.

scholarly journals Geospatial Analysis of Land Use/Land Cover Dynamics on Lake Abaya-Chamo Wetland in Southern Rift-Valley of Ethiopia

2021 ◽  
Author(s):  
Tariku Zekarias ◽  
Vanum Govindu ◽  
Yechale Kebede ◽  
Abren Gelaw
Keyword(s):  
Land Use ◽  
Vegetation Index ◽  
Normalized Difference Vegetation Index ◽  
Agricultural Land ◽  
Anthropogenic Factors ◽  
Southern Ethiopia ◽  
Water Index ◽  
Normalized Difference Water Index ◽  
Change Matrix ◽  
The Impact

Abstract Wetlands worldwide and in Ethiopia have long been subject to severe degradation due to anthropogenic factors. This study was aimed at analyzing the impact of land use/cover dynamics on Lake Abaya-Chamo wetland in 1990–2019. Data were acquired via Landsat TM of 1990, ETM + of 2000, and OLI of 2010 and 2019 images plus using interview. Unsupervised and supervised classifications (via ERDAS14 and ArcGIS10.5) were applied to detect land use/cover classes. Normalized difference vegetation index, normalized difference water index, change matrix model and Kappa coefficients were used for analysis of the land use/cover dynamics in the lake-wetland. It was found that forest; water, shrub land, agricultural land, settlement and swamp area were the main land use/cover classes. While ‘settlement’ and ‘water body’ of the lake-wetland increased at progressively increasing magnitudes of changes in three periods within 1990–2019, ‘shrub land’ and ‘swamp’ declined at progressively increasing magnitudes of loss in the same periods. The NDWI result revealed that ‘swamp’ area shrank by 48.9% (2,991 ha) due to siltation-led expansion of the lake-water in three decades. Siltation, rapid population growth-led expansion of settlement and irrigation-based farming were the main drivers of the land use/cover dynamics and degradation of the lake-wetland. Thus, consistent mapping and integrated actions should be taken to curb the threats on the sustainability of the lake-wetland in Southern Ethiopia.

scholarly journals Sustainable Agricultural Land Management in Garut Regency, West Java Province, Indonesia

2021 ◽  
Author(s):  
Lia Warlina ◽  
◽  
Syach Berriant Restu Pradana ◽  
Keyword(s):  
Land Use ◽  
Land Management ◽  
Rice Field ◽  
Agricultural Land ◽  
Land Conversion ◽  
Online Questionnaire ◽  
The Government ◽  
Agricultural Land Management ◽  
The Impact ◽  
Field Area

The high land conversion rate to other sectors has led the government to issue Law No. 41 in 2009 concerning Protection of Sustainable Agricultural Land (SAL). The study aims to identify the distribution of sustainable agricultural land uses and determine agricultural land-use changes from 2016 to 2019 and determine farmers' understanding of sustainable agricultural land control in the strategic area of Garut Regency. We overlaid the land use maps of Garut Regency in 2016 and 2019 and conducted a survey using an online questionnaire with a Google form. The research location is in five districts in Garut Regency. The results showed no land conversion in the area of existing sustainable agricultural land in Garut Regency. The total rice field area is 6,081 hectares, with about 24% is sustainable agricultural land. From 2016 to 2019, the rice field area decreased by 12 hectares. The farmers' awareness of SAL tends to be more likely aware of the sustainable agricultural land area, as many as 39% of farmers aware of sustainable agricultural land. The incentives given to farmers who control sustainable agricultural land are tax deduction, agricultural infrastructure supply, agricultural production facilities subsidies, and land certification facilities. The majority of the respondents are aware of these incentives. In conclusion, no sustainable agricultural land is converted, even though changes occur in non-sustainable agricultural land. The impact of this study is for recommendations to the government in sustainable agricultural land management.

scholarly journals Degradation of Wetlands and Livelihood Dependence on Lake Abaya-Chamo Wetland, Southern Ethiopia.

2021 ◽  
Author(s):  
Tariku Zekarias ◽  
Vanum Govindu ◽  
Yechale Kebede ◽  
Abren Gelaw
Keyword(s):  
Land Degradation ◽  
Driving Forces ◽  
Carbon Sink ◽  
Legal Framework ◽  
Anthropogenic Factors ◽  
Southern Ethiopia ◽  
Wetland Degradation ◽  
Local Climate ◽  
Salty Water ◽  
The Government

Abstract Abaya-Chamo and other wetlands of Ethiopia provide multiple ecosystem services, they are extremely affected by various anthropogenic factors. The unsustainable use of wetlands stems from the negligence of the users about the wetland degradation and the limited policy attention by decision-makers. This study was aimed at analyzing the livelihood benefits of Abaya-chamo lake-wetland and the driving forces of its degradation. Data were gathered using questionnaire survey of 384 households (selected via systematic random sampling), focus group discussion, interview and field observation. Percent, regression, etc., were used for data analysis. It was found that Abaya-chamo lake-wetland offers fish, timber, firewood, fodder, irrigation water, farmland, rainfall, recreation, tourism, aesthetic, carbon sink, air quality and climate regulation, etc., services to local people. Farm expansion, sedimentation, irrigation, invasive plants (e.g. emboch), open access and overuse of resources, lack of legal framework and rapid population growth were the main causes of the wetland degradation. Applying the lakes’ salty-water for irrigation is expected to lead to chemical land degradation in the next few decades. The invasive emboch-plant results in dwindling aquatic resources (e.g. fish), loss of economic and tour benefits, and change in local climate thereby depleting the lake water, and the dissolved O2 and CO2 storage capacity of the lake-wetland rapidly. The lakes’ salty-water based irrigation is expected to result in chemical land degradation to the extent of abandoning crop farming in the next few decades unless some actions are taken. Thus, the government should formulate clear policy and legal framework about sustainable management of wetland resources.

scholarly journals Land Use/Land Cover Change Impact on Hydrological Process in the Upper Baro Basin, Ethiopia

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Tewodros Getu Engida ◽  
Tewodros Assefa Nigussie ◽  
Abreham Berta Aneseyee ◽  
John Barnabas
Keyword(s):  
Land Use ◽  
Land Cover ◽  
Agricultural Land ◽  
Swat Model ◽  
The United States ◽  
United States Geological Survey ◽  
Hydrological Process ◽  
Land Use Land Cover ◽  
Validation Period ◽  
The Impact

Understanding the hydrological process associated with Land Use/Land Cover (LU/LC) change is vital for decision-makers in improving human wellbeing. LU/LC change significantly affects the hydrology of the landscape, caused by anthropogenic activities. The scope of this study is to investigate the impact of LU/LC change on the hydrological process of Upper Baro Basin for the years 1987, 2002, and 2017. The Soil Water Assessment Tool (SWAT) model was used for the simulation of the streamflow. The required data for the SWAT model are soils obtained from the Food and Agriculture Organization; Digital Elevation Model (DEM) and LU/LC were obtained from the United States Geological Survey (USGS). The meteorological data such as Rainfall, Temperature, Sunshine, Humidity, and Wind Speeds were obtained from the Ethiopian National Meteorological Agency. Data on discharge were obtained from Ministry of Water, Irrigation and Electricity. Ecosystems are deemed vital. Landsat images were used to classify the LU/LC pattern using ERDAS Imagine 2014 software and the LU/LC were classified using the Maximum Likelihood Algorithm of Supervised Classification. The Sequential Uncertainty Fitting (SUFI-2) global sensitivity method within SWAT Calibration and Uncertainty Procedures (SWAT-CUP) was used to identify the most sensitive streamflow parameters. The calibration was carried out using observed streamflow data from 01 January 1990 to 31 December 2002 and a validation period from 01 January 2003 to 31 December 2009. LU/LC analysis shows that there was a drastic decrease of grassland by 15.64% and shrubland by 9.56% while an increase of agricultural land and settlement by 18.01% and 13.01%, respectively, for 30 years. The evaluation of the SWAT model presented that the annual surface runoff increased by 43.53 mm, groundwater flow declined by 27.58 mm, and lateral flow declined by 5.63 mm. The model results showed that the streamflow characteristics changed due to the LU/LC change during the study periods 1987–2017 such as change of flood frequency, increased peak flows, base flow, soil erosion, and annual mean discharge. Curve number, an available water capacity of the soil layer, and soil evaporation composition factor were the most sensitive parameters identified for the streamflow. Both the calibration and validation results disclosed a good agreement between measured and simulated streamflow. The performance of the model statistical test shows the coefficient of determination (R2) and Nash–Sutcliffe (NS) efficiency values 0.87 and 0.81 for calibration periods of 1990–2002 and 0.84 and 0.76 for the validation period of 2003 to 2009, respectively. Overall, LU/LC significantly affected the hydrological condition of the watershed. Therefore, different conservation strategies to maintain the stability and resilience of the ecosystem are vital.

scholarly journals The impact of incentives on the decision to transfer agricultural land functions to non-agricultural uses

2021 ◽  
Vol 916 (1) ◽  
pp. 012029
Author(s):  
G Prayitno ◽  
D Dinanti ◽  
N Sari ◽  
I I Hidayana ◽  
F A A Azizi
Keyword(s):  
Land Use ◽  
Land Use Change ◽  
Rural Areas ◽  
Agricultural Land ◽  
Descriptive Analysis ◽  
The Government ◽  
People’S Attitudes ◽  
Agricultural Yields ◽  
The Impact ◽  
Land Policies

Abstract The influence of incentives on landowner’s decision-making regarding land-use change is an intriguing consideration when developing sustainable agricultural land policies. Owners of agricultural land in rural areas with varying characteristics and varying agricultural yields each year have varying views on changing or maintaining their land. The purpose of this study was to determine the effect of incentives on people’s attitudes toward maintaining or selling land (land-use change from agricultural land to non-agricultural land). This study employed a descriptive analysis to calculate the impact of incentives from the government on the decision to change or keep the land. The responses of 500 respondents were categorized as follows: 20-46.67 in favor of land change, 46.67-73.33 neutral, and 73.4-100 in favor of maintaining land. The analysis revealed that additional factors influence the decision to sell or maintain the land. However, some villages seek to preserve land through government incentives.

Water quality in two Icelandic rivers: the influence of impoundment, agriculture, glaciation and permafrost

2014 ◽  
Vol 46 (3) ◽  
pp. 429-445 ◽  
Author(s):  
Nicholas Jones ◽  
Chris Parker
Keyword(s):  
Water Quality ◽  
Land Use ◽  
Agricultural Land ◽  
Anthropogenic Factors ◽  
Agricultural Land Use ◽  
Significant Drop ◽  
Spatial And Temporal Scales ◽  
Permafrost Soils ◽  
The Impact

The water quality of Icelandic rivers is controlled by a number of natural and anthropogenic factors interacting at complex spatial and temporal scales. This article presents the findings of a study into the water quality of two Icelandic rivers; the Blanda and the Skjálfandafljót. The study investigated the impact of three of the factors influencing water quality in these rivers: impoundment for hydro-electric power generation; agricultural land use; and the presence of glacial and periglacial areas. The results indicate that impoundment within a reservoir was responsible for a significant reduction in turbidity and a significant drop in aluminium concentrations as the reservoir acted as a sediment trap and chemical sink. Agricultural land use was found to have no significant effect on the nitrate or phosphate concentrations. Increasing glacial influence was found to be associated with increased turbidity but decreased total dissolved solids. Finally, the presence of permafrost soils in the periglacial highlands of the Blanda was positively associated with aluminium concentrations.

scholarly journals DPSIR MODEL AS A TOOL TO ASSES LAND CONVERSION TARIFF POLICY IN YOGYAKARTA

2015 ◽  
Vol 10 (2) ◽  
pp. 101
Author(s):  
Nina Novira ◽  
Syarifah Aini Dalimunthe ◽  
Aditya Pandu Wicaksono ◽  
Nur Indah Sari Dewi ◽  
Triana Sefti Rahayu
Keyword(s):  
Land Use ◽  
Land Use Change ◽  
Agricultural Land ◽  
Land Use Changes ◽  
Social Dimension ◽  
Tariff Policy ◽  
Land Utilization ◽  
Economic Dimension ◽  
The Government ◽  
The Impact

Land use change from agricultural land to non-agricultural purposes in Yogyakarta Special Province (DIY) is the main factor leading to the decrease of agricultural land. The increasing population growth has led to a higher demand for land, which is contributing to the rapid land use changes. Land scarcity has led to a change in land utilization within the city and in the surrounding area. The DPSIR Model is used as the basis for the impact assessment analysis on the tariff policy implementation regarding to the controlling of the land use change. Driving force in this model is migration and the pressure is land use change. The state is divided into three categories, state of economic dimension, environmental dimension, and social dimension. These have caused impacts on land degradation, threats to food security, and pollution. As the response to this, the government introduced the policy PERDA No. 53 Year 2007 about authorizing land use in DIY. This paper is intended to explain how the DPSIR model is used to assess the policy implementation.Keywords: DPSIR, Assessment, Land Use Change, Land Use Policy.

scholarly journals Impact of land-use land cover dynamics on runoff in Panchnoi River basin, North East India

GeoScape ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 19-29
Author(s):  
Monoj Kumar Jaiswal ◽  
Nurul Amin
Keyword(s):  
Land Use ◽  
Soil Erosion ◽  
Land Use Change ◽  
Land Cover ◽  
River Basin ◽  
Alluvial Plain ◽  
Land Use Land Cover ◽  
Runoff Generation ◽  
Land Cover Dynamics ◽  
The Impact

Abstract Alteration of land-use land cover pattern causes severe consequences on the hydrological system by modifying the rainfall-runoff pattern in a region. The study aimed to investigate the impact of land-use land-cover dynamics on runoff generation in different geomorphic divisions of Panchnoi River basin. The study used the Soil Conservation Service-Curve Number method to estimate runoff generation in the Panchnoi River basin in a GIS platform. This study observed that the conversion of the land-use pattern in the geomorphic zones significantly enhances runoff. The Piedmont experience highest land-use change, where 64.17 km2 forest cover lost to cropland and built-up lands, leads to a notable increase in runoff generation, i.e. from 1 076 mm (52.82% of rainfall) in 1990 to 1 467 mm (70.46% of rainfall) in 2015. The Flood plain and New alluvial plain generates high runoff in the basin as it mostly occupied by human-induced land-uses, i.e. 1 444 mm (72.72% of rainfall) and 1 360 mm (71.70% of rainfall) respectively in 1990, which increase to 1588 mm (79.20%) and 1507 mm (78.69%) runoff respectively in 2015, due to alteration of cropland to built-up lands. In the Old alluvial plain, a marginal land-use change observed resulted in moderate growth in runoff from 1 272 mm (62.35%) to 1 404 mm (66.79%). The study indicates land-use land-cover change invokes to increase runoff generation can give rise severe environmental and economic problems in the river basin, through the occurrence of flashflood and soil erosion. Highlights for public administration, management and planning: • Evaluation of the impact of land-use land cover dynamics on runoff is essential for containing flash flood and water resource management on a basin scale. • Alteration of natural land covers has severe implications in the form of flood, soil erosion, and loss of biodiversity. • Enhanced runoff due to land-use dynamics reduces groundwater recharge rate that may cause drinking water scarcity in the dry season shortly.

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