scholarly journals Modeling the hydrological effects of climate and land use/cover changes in Chinese lowland polder using an improved WALRUS model

2016 ◽  
Vol 47 (S1) ◽  
pp. 84-101 ◽  
Author(s):  
Renhua Yan ◽  
Junfeng Gao ◽  
Lingling Li
Keyword(s):  
Land Use ◽  
Land Use Changes ◽  
The Other ◽  
Hydrological Processes ◽  
Lake Basin ◽  
The Past ◽  
Poyang Lake Basin ◽  
Pumping Stations ◽  
Double Rice ◽  
Hydrological Effects

Hydrological processes in lowland polders, especially those for paddy rice planting, are affected by complicated factors. The improved Wageningen Lowland Runoff Simulator (WALRUS) model incorporates an irrigation and drainage scheme, and a new stage–discharge relationship to account for hydrological processes in multi-land-use polder with paddy fields and pumping stations. Here, this model was applied to assess how climate and land use changes affected the runoff of a Chinese polder in Poyang Lake basin in the past two decades. Simulated results showed that the runoff in the autumn–winter transition and midsummer months increased significantly, whereas those in the other months decreased slightly during the period of 1996–2005, primarily affected by climate change. For the period of 2006–2014, the runoff in the autumn–winter transition and midsummer increased, while that in the other months declined, affected by both climate and land use/cover changes. The land use/cover change resulting from the conversion of rice–wheat rotation to dominantly double-rice cropping and the expansion of residential area, increased the runoff during this period by demanding more irrigation water from the outside basin.

scholarly journals Classification of Land Use Changes (Model Area: Nitra Town)

2015 ◽  
Vol 34 (3) ◽  
pp. 249-259 ◽  
Author(s):  
Ivana Haladová ◽  
František Petrovič
Keyword(s):  
Land Use ◽  
Agricultural Land ◽  
Land Use Changes ◽  
The Other ◽  
New Classification ◽  
The Past ◽  
Industrial Parks ◽  
The Town

Abstract This paper deals with the new classification of land use changes. We chose Nitra town in Slovakia as a model area. We examined changes of land use for the period 2003-2013. The main result of this work is a table for types of land use changes and a map that shows the location of these changes in Nitra town. Nitra is constantly expanding its area and it is also significantly changing within its borders. Agriculturally used surroundings of the town are being transformed into build-up areas and industrial parks. This transformation causes a loss of agricultural land and vegetation, in general. Agriculture in this region has been gradually declining and disappearing in the past years. On the other side, urbanisation, technicisation and industrialisation are highly supported

scholarly journals Predicting Land Use/Land Cover Changes Using a CA-Markov Model under Two Different Scenarios

2018 ◽  
Vol 10 (10) ◽  
pp. 3421 ◽  
Author(s):  
Rahel Hamad ◽  
Heiko Balzter ◽  
Kamal Kolo
Keyword(s):  
Land Use ◽  
Markov Chain ◽  
Land Cover ◽  
Land Use Changes ◽  
Landsat 8 ◽  
Chain Model ◽  
Land Use Land Cover ◽  
Kurdistan Region ◽  
The Past ◽  
Past Trend

Multi-temporal Landsat images from Landsat 5 Thematic Mapper (TM) acquired in 1993, 1998, 2003 and 2008 and Landsat 8 Operational Land Imager (OLI) from 2017, are used for analysing and predicting the spatio-temporal distributions of land use/land cover (LULC) categories in the Halgurd-Sakran Core Zone (HSCZ) of the National Park in the Kurdistan region of Iraq. The aim of this article was to explore the LULC dynamics in the HSCZ to assess where LULC changes are expected to occur under two different business-as-usual (BAU) assumptions. Two scenarios have been assumed in the present study. The first scenario, addresses the BAU assumption to show what would happen if the past trend in 1993–1998–2003 has continued until 2023 under continuing the United Nations (UN) sanctions against Iraq and particularly Kurdistan region, which extended from 1990 to 2003. Whereas, the second scenario represents the BAU assumption to show what would happen if the past trend in 2003–2008–2017 has to continue until 2023, viz. after the end of UN sanctions. Future land use changes are simulated to the year 2023 using a Cellular Automata (CA)-Markov chain model under two different scenarios (Iraq under siege and Iraq after siege). Four LULC classes were classified from Landsat using Random Forest (RF). Their accuracy was evaluated using κ and overall accuracy. The CA-Markov chain method in TerrSet is applied based on the past trends of the land use changes from 1993 to 1998 for the first scenario and from 2003 to 2008 for the second scenario. Based on this model, predicted land use maps for the 2023 are generated. Changes between two BAU scenarios under two different conditions have been quantitatively as well as spatially analysed. Overall, the results suggest a trend towards stable and homogeneous areas in the next 6 years as shown in the second scenario. This situation will have positive implication on the park.

scholarly journals Impacts of land use changes on net ecosystem production in the Taihu Lake Basin of China from 1985 to 2010

2017 ◽  
Vol 122 (3) ◽  
pp. 690-707 ◽  
Author(s):  
Xibao Xu ◽  
Guishan Yang ◽  
Yan Tan ◽  
Xuguang Tang ◽  
Hong Jiang ◽  
...  
Keyword(s):  
Land Use ◽  
Taihu Lake ◽  
Land Use Changes ◽  
Net Ecosystem Production ◽  
Lake Basin ◽  
Taihu Lake Basin ◽  
Ecosystem Production

scholarly journals Mapping of Major Land-Use Changes in the Kolleru Lake Freshwater Ecosystem by Using Landsat Satellite Images in Google Earth Engine

Water ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2493 ◽  
Author(s):  
Meena Kumari Kolli ◽  
Christian Opp ◽  
Daniel Karthe ◽  
Michael Groll
Keyword(s):  
Land Use ◽  
Land Cover ◽  
Land Use Changes ◽  
Google Earth ◽  
Nutrient Concentrations ◽  
Freshwater Ecosystem ◽  
Lake Ecosystem ◽  
Lake Basin ◽  
Lake Area ◽  
Google Earth Engine

India’s largest freshwater ecosystem of the Kolleru Lake has experienced severe threats by land-use changes, including the construction of illegal fishponds around the lake area over the past five decades. Despite efforts to protect and restore the lake and its riparian zones, environmental pressures have increased over time. The present study provides a synthesis of human activities through major land-use changes around Kolleru Lake both before and after restoration measures. For this purpose, archives of all Landsat imageries from the last three decades were used to detect land cover changes. Using the Google Earth Engine cloud platform, three different land-use scenarios were classified for the year before restoration (1999), for 2008 immediately after the restoration, and for 2018, i.e., the current situation of the lake one decade afterward. Additionally, the NDVI (Normalized Difference Vegetation Index) and NDWI (Normalized Difference Water Index) indices were used to identify land cover dynamics. The results show that the restoration was successful; consequently, after a decade, the lake was transformed into the previous state of restoration (i.e., 1999 situation). In 1999, 29.7% of the Kolleru Lake ecosystem was occupied by fishponds, and, after a decade of sustainable restoration, 27.7% of the area was fishponds, almost reaching the extent of the 1999 situation. On the one hand, aquaculture is one of the most promising sources of income, but there is also limited awareness of its negative environmental impacts among local residents. On the other hand, political commitment to protect the lake is weak, and integrated approaches considering all stakeholders are lacking. Nevertheless, alterations of land and water use, increasing nutrient concentrations, and sediment inputs from the lake basin have reached a level at which they threaten the biodiversity and functionality of India’s largest wetland ecosystem to the degree that immediate action is necessary to prevent irreversible degradation.

scholarly journals What the past suggests about future development of ecosystem service values applicable to USDA agricultural program evaluations

2020 ◽  
Vol 49 (1) ◽  
pp. 7-22
Author(s):  
LeRoy T. Hansen
Keyword(s):  
Land Use ◽  
Spatial Resolution ◽  
Future Development ◽  
Ecosystem Service ◽  
Land Use Changes ◽  
Program Evaluations ◽  
The Past ◽  
Limited Applicability ◽  
Program Benefit

Much of the research on ecosystem service values (ESVs) has limited applicability to USDA program benefit analyses, largely because the models/data/results (1) lack spatial breadth and hence cannot be applied in national analyses of USDA programs, and (2) do not link land use changes to the changes in ESs. This article provides an overview of a set of 15 ESVs related to agriculture's impacts on erosion in order to identify (1) weaknesses in methods, data, and assumptions that limit the quality of the ESVs and means of avoiding such weaknesses in future ESV development, and (2) approaches that might improve the reliability and spatial resolution of future ESV estimates.

scholarly journals The impact of climate and land-use changes on the hydrological processes of Owabi catchment from SWAT analysis

2019 ◽  
Vol 25 ◽  
pp. 100620 ◽  
Author(s):  
Marian Amoakowaah Osei ◽  
Leonard Kofitse Amekudzi ◽  
David Dotse Wemegah ◽  
Kwasi Preko ◽  
Emmanuella Serwaa Gyawu ◽  
...  
Keyword(s):  
Land Use ◽  
Land Use Changes ◽  
Hydrological Processes ◽  
The Impact

scholarly journals Impact of Land Use Changes and Dynamic Vegetation Changes on Vascular Flora Diversity in Małków–Bartochów (the Warta River Valley)

2011 ◽  
Vol 7 ◽  
pp. 125-138 ◽  
Author(s):  
Beata Woziwoda ◽  
Dorota Michalska-Hejduk
Keyword(s):  
Land Use ◽  
Vascular Plant ◽  
Land Use Changes ◽  
River Valley ◽  
Special Focus ◽  
Vegetation Changes ◽  
Ecological Groups ◽  
The Past ◽  
Natural Factors ◽  
Flora Diversity

The paper presents the changes of vascular plant flora in the Małków–Bartochów peatland area (the Warta River valley) which took place over a 40-year period. Vanishing, permanent and new components of the flora are presented with a special focus on valuable (protected by the law, threatened and locally rare) species. Changes in the share of ecological groups are estimated and discussed. Anthropogenic and natural factors, directly or indirectly influencing (in the past and at present) flora composition, are noted and analyzed.

scholarly journals Aerosol size distribution and radiative forcing response to anthropogenically driven historical changes in biogenic secondary organic aerosol formation

2014 ◽  
Vol 14 (19) ◽  
pp. 26297-26348
Author(s):  
S. D. D'Andrea ◽  
J. C. Acosta Navarro ◽  
S. C. Farina ◽  
C. E. Scott ◽  
A. Rap ◽  
...  
Keyword(s):  
Land Use ◽  
Radiative Forcing ◽  
Secondary Organic Aerosol ◽  
Land Use Changes ◽  
Organic Aerosol ◽  
Anthropogenic Emissions ◽  
The Past ◽  
Year 2000 ◽  
Global Mean ◽  
Past Millennium

Abstract. Emissions of biogenic volatile organic compounds (BVOC) have changed in the past millennium due to changes in land use, temperature and CO2 concentrations. Recent model reconstructions of BVOC emissions over the past millennium predicted changes in dominant secondary organic aerosol (SOA) producing BVOC classes (isoprene, monoterpenes and sesquiterpenes). The reconstructions predicted that global isoprene emissions have decreased (land-use changes to crop/grazing land dominate the reduction), while monoterpene and sesquiterpene emissions have increased (temperature increases dominate the increases); however, all three show regional variability due to competition between the various influencing factors. These BVOC changes have largely been anthropogenic in nature, and land-use change was shown to have the most dramatic effect by decreasing isoprene emissions. In this work, we use two modeled estimates of BVOC emissions from the years 1000 to 2000 to test the effect of anthropogenic changes to BVOC emissions on SOA formation, global aerosol size distributions, and radiative effects using the GEOS-Chem-TOMAS global aerosol microphysics model. With anthropogenic emissions (e.g. SO2, NOx, primary aerosols) held at present day values and BVOC emissions changed from year 1000 to year 2000 values, decreases in the number concentration of particles of size Dp > 80 nm (N80) of >25% in year 2000 relative to year 1000 were predicted in regions with extensive land-use changes since year 1000 which led to regional increases in direct plus indirect aerosol radiative effect of >0.5 W m−2 in these regions. We test the sensitivity of our results to BVOC emissions inventory, SOA yields and the presence of anthropogenic emissions; however, the qualitative response of the model to historic BVOC changes remains the same in all cases. Accounting for these uncertainties, we estimate millennial changes in BVOC emissions cause a global mean direct effect of between +0.022 and +0.163 W m−2 and the global mean cloud-albedo aerosol indirect effect of between −0.008 and −0.056 W m−2. This change in aerosols, and the associated radiative forcing, could be a~largely overlooked and important anthropogenic aerosol effect on regional climates.

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