scholarly journals Study on Relationship of Land Cover Changes and Ecohydrological Processes of the Tuul River Basin

2021 ◽  
Vol 13 (3) ◽  
pp. 1153
Author(s):  
Batsuren Dorjsuren ◽  
Nyamdavaa Batsaikhan ◽  
Denghua Yan ◽  
Otgonbayar Yadamjav ◽  
Sonomdagva Chonokhuu ◽  
...  
Keyword(s):  
Land Cover ◽  
River Basin ◽  
Air Temperature ◽  
River Discharge ◽  
Water Bodies ◽  
Annual Precipitation ◽  
Land Cover Changes ◽  
Hydrometeorological Parameters ◽  
Satellite Analysis ◽  
Ecohydrological Processes

The Tuul River Basin is the most important socioeconomic and political base area of Mongolia. Therefore, studying the interrelationships between changes in the ecohydrological processes of this basin and its land cover is of great importance for maintaining sustainability and the environment. This study investigated the annual average air temperature, total annual precipitation, and river discharge variability, and land cover changes at selected stations of the basin by using the hydrometeorological analysis, satellite analysis, and land cover determination statistical analysis. During the study period, the average annual air temperature rose from −1.5 °C to +0.3 °C (1.8 °C 361 °C). The average annual precipitation exhibits relatively low change during this period. River discharge varied during the study period. A significant decreasing trend in river discharge was observed at the Terelj (φ = −2.72) and Ulaanbaatar (φ = −5.63) stations, whereas the other stations, Altanbulag, Lun, and Orkhontuul, showed a significant increasing trend. During the study period, changes in land cover were directly related to main hydrometeorological parameters. Between 2000 and 2020, the amount of grassland decreased by 319.67 km2, while the area of water bodies increased by 28.36 km2. In the study area, mainly water bodies and sensitive areas of the land cover types were changed due to changes in precipitation. Studies in the arid and semiarid regions of Central Asia show that changes of ecohydrological processes have a significant impact on land cover changes.

scholarly journals Modeling the Effects of Anthropogenic Land Cover Changes to the Main Hydrometeorological Factors in a Regional Watershed, Central Greece

Climate ◽  
2019 ◽  
Vol 7 (11) ◽  
pp. 129 ◽  
Author(s):  
Angeliki Mentzafou ◽  
George Varlas ◽  
Elias Dimitriou ◽  
Anastasios Papadopoulos ◽  
Ioannis Pytharoulis ◽  
...  
Keyword(s):  
Climate Change ◽  
Land Cover ◽  
Case Studies ◽  
Air Temperature ◽  
River Discharge ◽  
Agricultural Land ◽  
Actual Evapotranspiration ◽  
Land Cover Changes ◽  
Central Greece ◽  
The Impact

In this study, the physically-based hydrological model MIKE SHE was employed to investigate the effects of anthropogenic land cover changes to the hydrological cycle components of a regional watershed in Central Greece. Three case studies based on the land cover of the years 1960, 1990, and 2018 were examined. Copernicus Climate Change Service E-OBS gridded meteorological data for 45 hydrological years were used as forcing for the model. Evaluation against observational data yielded sufficient quality for daily air temperature and precipitation. Simulation results demonstrated that the climatic variabilities primarily in precipitation and secondarily in air temperature affected basin-averaged annual actual evapotranspiration and average annual river discharge. Nevertheless, land cover effects can locally outflank the impact of climatic variability as indicated by the low interannual variabilities of differences in annual actual evapotranspiration among case studies. The transition from forest to pastures or agricultural land reduced annual actual evapotranspiration and increased average annual river discharge while intensifying the vulnerability to hydrometeorological-related hazards such as droughts or floods. Hence, the quantitative assessment of land cover effects presented in this study can contribute to the design and implementation of successful land cover and climate change mitigation and adaptation policies.

scholarly journals Assessment of Spatio-Temporal Changes of Land Use and Land Cover over South-Western African Basins and Their Relations with Variations of Discharges

Hydrology ◽  
2018 ◽  
Vol 5 (4) ◽  
pp. 56 ◽  
Author(s):  
Salomon Obahoundje ◽  
Arona Diedhiou ◽  
Eric Antwi Ofosu ◽  
Sandrine Anquetin ◽  
Baptiste François ◽  
...  
Keyword(s):  
Land Use ◽  
Land Cover ◽  
Agricultural Land ◽  
Water Bodies ◽  
Annual Precipitation ◽  
Land Cover Changes ◽  
Climate Services ◽  
Discharge Data ◽  
Spatio Temporal ◽  
Annual Discharge

West African basins play a vital role in the socio-economic development of the region. They are mostly trans-boundary and sources of different land use practices. This work attempts to assess the spatio-temporal land use and land cover changes over three South Western African basins (Volta, Mono and Sassandra basins) and their influence on discharge. The land use and land cover maps of each basin were developed for 1988, 2002 and 2016. The results show that all the studied basins present an increase in water bodies, built-up, agricultural land and a decline in vegetative areas. These increases in water bodies and land use are as a result of an increase in small reservoirs, of dugouts and of dam constructions. However, the decline in some vegetative clusters could be attributed to the demographic and socio-economic growth as expressed by the expansion of agriculture and urbanization. The basic statistical analysis of precipitation and discharge data reveals that the mean annual discharge varies much more than the total annual precipitation at the three basins. For instance, in the entire Volta basin, the annual precipitation coefficient of variation (CV) is 10% while the annual discharge CV of Nawuni, Saboba and Bui are 43.6%, 36.51% and 47.43%, respectively. In Mono basin, the annual precipitation CV is 11.5% while the Nangbeto and Athieme annual discharge CV are 37.15% and 46.60%, respectively. The annual precipitation CV in Sassandra basin is 7.64% while the annual discharge CV of Soubre and Dakpadou are 29.41% and 37%, respectively. The discharge varies at least three times much more than the precipitation in the studied basins. The same conclusion was found for all months except the driest months (December and January). We showed that this great variation in discharge is mainly due to land use and land cover changes. Beside the hydrological modification of the land use and land cover changes, the climate of the region as well as the water quality and availability and the hydropower generation may be impacted by these changes in land surfaces conditions. Therefore, these impacts should be further assessed to implement appropriate climate services and measures for a sustainable land use and water management.

Impacts of land-use and land-cover changes on river runoff in Yellow River basin for period of 1956–2012

2017 ◽  
Vol 27 (1) ◽  
pp. 13-24 ◽  
Author(s):  
Fang Wang ◽  
Quansheng Ge ◽  
Qibiao Yu ◽  
Huaxin Wang ◽  
Xinliang Xu
Keyword(s):  
Land Use ◽  
Land Cover ◽  
River Basin ◽  
River Runoff ◽  
Yellow River ◽  
Yellow River Basin ◽  
Land Cover Changes

scholarly journals Impacts of Land Cover Changes on Ecosystem Carbon Stocks Over the Transboundary Tumen River Basin in Northeast Asia

2018 ◽  
Vol 28 (6) ◽  
pp. 973-985 ◽  
Author(s):  
Hengxing Xiang ◽  
Mingming Jia ◽  
Zongming Wang ◽  
Lin Li ◽  
Dehua Mao ◽  
...  
Keyword(s):  
Land Cover ◽  
River Basin ◽  
Northeast Asia ◽  
Carbon Stocks ◽  
Land Cover Changes ◽  
Tumen River ◽  
Ecosystem Carbon ◽  
Ecosystem Carbon Stocks

The «rainfall-runoff» system and its long-term fluctuations in the Siverskyi Donets River Basin (Ukraine)

2021 ◽  
Author(s):  
Hanna Bolbot ◽  
Vasyl Grebin
Keyword(s):  
Climate Change ◽  
Water Resources ◽  
River Basin ◽  
Air Temperature ◽  
River Runoff ◽  
Annual Runoff ◽  
Annual Precipitation ◽  
Spring Flood ◽  
Current Period

<p>The current patterns estimation of the water regime under climate change is one of the most urgent tasks in Ukraine and the world. Such changes are determined by fluctuations in the main climatic characteristics - precipitation and air temperature, which are defined the value of evaporation. These parameters influence on the annual runoff distribution and long-term runoff fluctuations. In particular, the annual precipitation redistribution is reflected in the corresponding changes in the river runoff.<br>The assessment of the current state and nature of changes in precipitation and river runoff of the Siverskyi Donets River Basin was made by comparing the current period (1991-2018) with the period of the climatological normal (1961-1990).<br>In general, for this area, it was defined the close relationship between the amount of precipitation and the annual runoff. Against the background of insignificant (about 1%) increase of annual precipitation in recent decades, it was revealed their redistribution by seasons and separate months. There is a decrease in precipitation in the cold period (November-February). This causes (along with other factors) a decrease in the amount of snow and, accordingly, the spring flood runoff. There are frequent cases of unexpressed spring floods of the Siverskyi Donets River Basin. The runoff during March-April (the period of spring flood within the Ukrainian part of the basin) decreased by almost a third.<br>The increase of precipitation during May-June causes a corresponding (insignificant) increase in runoff in these months. The shift of the maximum monthly amount of precipitation from May (for the period 1961-1990) to June (in the current period) is observed.<br>There is a certain threat to water supply in the region due to the shift in the minimum monthly amount of precipitation in the warm period from October to August. Compared with October, there is a higher air temperature and, accordingly, higher evaporation in August, which reduces the runoff. Such a situation is solved by rational water resources management of the basin. The possibility of replenishing water resources in the basin through the transfer runoff from the Dnieper (Dnieper-Siverskyi Donets channel) and the annual runoff redistribution in the reservoir system causes some increase in the river runoff of summer months in recent decades. This is also contributed by the activities of the river basin management structures, which control the maintenance water users' of minimum ecological flow downstream the water intakes and hydraulic structures in the rivers of the basin.<br>Therefore, in the period of current climate change, the annual runoff distribution of the Siverskyi Donets River Basin has undergone significant changes, which is related to the annual precipitation redistribution and anthropogenic load on the basin.</p>

Increased evapotranspiration from land cover changes intensified water crisis in an arid river basin in northwest China

2019 ◽  
Vol 574 ◽  
pp. 383-397 ◽  
Author(s):  
Yaoliang Chen ◽  
Shusen Wang ◽  
Zhiguo Ren ◽  
Jingfeng Huang ◽  
Xiuzhen Wang ◽  
...  
Keyword(s):  
Land Cover ◽  
River Basin ◽  
Northwest China ◽  
Land Cover Changes ◽  
Water Crisis

Assessment of land-cover changes in a sub-catchment of the Oti basin (West Africa): A case study of the Kara River basin

2014 ◽  
Vol 2014 (1) ◽  
pp. 151-170 ◽  
Author(s):  
Hèou Maléki Badjana ◽  
Peter Selsam ◽  
Kpérkouma Wala ◽  
Wolfgang-Albert Flügel ◽  
Manfred Fink ◽  
...  
Keyword(s):  
Land Cover ◽  
West Africa ◽  
River Basin ◽  
Land Cover Changes
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