scholarly journals Spatial priority conservation areas for water yield ecosystem service under climate changes in Teshio watershed, northernmost Japan

2018 ◽  
Vol 11 (1) ◽  
pp. 106-129
Author(s):  
Min Fan ◽  
Hideaki Shibata ◽  
Li Chen
Keyword(s):  
Climate Change ◽  
Water Resources ◽  
Surface Runoff ◽  
Climate Changes ◽  
Yield Response ◽  
Water Yield ◽  
Conservation Areas ◽  
Average Water ◽  
Conservation Model ◽  
Optimal Protection

Abstract Effective information regarding water yield response to climate change provides useful support for decision making in water resources management. By integrating a hydrology model into a systematic conservation model, we developed an approach for modeling impacts of climate change on the water cycles and constructing spatial priority conservation areas for water yield ecosystem services in Teshio watershed located in northernmost Japan. The climate changes were projected to have impacts in increasing surface runoff, lateral flow, groundwater discharge and water yield. Surface runoff especially decreased in April and May and increased in March and September with rising temperature. We then investigated the spatial hotspots of water yields in typical periods (February, April and October, annual average water yield) to determine spatially priority conservation areas for water resources in terms of their different protection targets. The results also indicated that the areas of spatial optimal protection for water yields across different periods dynamically changed from spatial and temporal standpoints. The optimal priority conservation areas were concentrated in the southwest, north and southeast of Teshio watershed through comprehensively taking into account water yields in typical periods. Our results indicated that combination of hydrology and systematic conservation models would improve sustainable management of water resources across the watershed.

scholarly journals Spatial conservation areas for water yield hydrological ecosystem services with their economic values effects under climate change: a case study of Teshio watershed located in northernmost of Japan

2019 ◽  
Vol 50 (6) ◽  
pp. 1679-1709 ◽  
Author(s):  
Min Fan ◽  
Daniel Ocloo Mawuko ◽  
Hideaki Shibata ◽  
Wei Ou
Keyword(s):  
Climate Change ◽  
Ecosystem Services ◽  
Water Resources ◽  
Climate Changes ◽  
Economic Value ◽  
Electricity Production ◽  
Water Yield ◽  
Conservation Areas ◽  
Economic Values ◽  
Hydro Power

Abstract Water resources prioritization conservation planners are increasingly becoming aware of the economic value of water supply ecosystem services (ESs) under climate changes. Here we assessed how the water yield ES framework is implemented in the current spatial prioritization conservation of the water resources under climate change across the Teshio River watershed. We applied the systematic conservation model to optimize the area for water resources which satisfied the protection targets with and without considering economic values of the water yield provision service. The model indicated that the areas of spatial optimal ES protection for water yield with considering economic values were totally different from those without considering economic values of water resources. The optimal priority conservation areas were concentrated in southwestern, southeastern, and some northern areas of this watershed. These places could guarantee water resources sustainability from both environmental protection and socio-economic development standpoints. Moreover, the spatial priority conservation areas for water yield with economic value from hydro-power electricity production were traded off against the areas for water yield with economic values from resident water-use and irrigation for rice. Therefore, the systematic conservation planning of water yield with economic values under climate changes may provide a useful argument to promote the conservation of water resources.

scholarly journals Watershed Hydrological Response to Combined Land Use/Land Cover and Climate Change in Highland Ethiopia: Finchaa Catchment

Water ◽  
2020 ◽  
Vol 12 (6) ◽  
pp. 1801 ◽  
Author(s):  
Wakjira Takala Dibaba ◽  
Tamene Adugna Demissie ◽  
Konrad Miegel
Keyword(s):  
Climate Change ◽  
Land Use ◽  
Water Resources ◽  
Land Cover ◽  
Surface Runoff ◽  
Regional Climate ◽  
Water Yield ◽  
Land Use Land Cover ◽  
Ensemble Mean ◽  
The Future

Land use/land cover (LULC) and climate change affect the availability of water resources by altering the magnitude of surface runoff, aquifer recharge, and river flows. The evaluation helps to identify the level of water resources exposure to the changes that could help to plan for potential adaptive capacity. In this research, Cellular Automata (CA)-Markov in IDRISI software was used to predict the future LULC scenarios and the ensemble mean of four regional climate models (RCMs) in the coordinated regional climate downscaling experiment (CORDEX)-Africa was used for the future climate scenarios. Distribution mapping was used to bias correct the RCMs outputs, with respect to the observed precipitation and temperature. Then, the Soil and Water Assessment Tool (SWAT) model was used to evaluate the watershed hydrological responses of the catchment under separate, and combined, LULC and climate change. The result shows the ensemble mean of the four RCMs reported precipitation decline and increase in future temperature under both representative concentration pathways (RCP4.5 and RCP8.5). The increases in both maximum and minimum temperatures are higher for higher emission scenarios showing that RCP8.5 projection is warmer than RCP4.5. The changes in LULC brings an increase in surface runoff and water yield and a decline in groundwater, while the projected climate change shows a decrease in surface runoff, groundwater and water yield. The combined study of LULC and climate change shows that the effect of the combined scenario is similar to that of climate change only scenario. The overall decline of annual flow is due to the decline in the seasonal flows under combined scenarios. This could bring the reduced availability of water for crop production, which will be a chronic issue of subsistence agriculture. The possibility of surface water and groundwater reduction could also affect the availability of water resources in the catchment and further aggravate water stress in the downstream. The highly rising demands of water, owing to socio-economic progress, population growth and high demand for irrigation water downstream, in addition to the variability temperature and evaporation demands, amplify prolonged water scarcity. Consequently, strong land-use planning and climate-resilient water management policies will be indispensable to manage the risks.

scholarly journals Local climate change projections and impact on the surface hydrology in the Vea catchment, West Africa

2021 ◽  
Author(s):  
Isaac Larbi ◽  
Fabien C. C. Hountondji ◽  
Sam-Quarcoo Dotse ◽  
Daouda Mama ◽  
Clement Nyamekye ◽  
...  
Keyword(s):  
Climate Change ◽  
Water Resources ◽  
West Africa ◽  
Surface Runoff ◽  
Swat Model ◽  
Northern Ghana ◽  
Water Yield ◽  
Mean Annual Temperature ◽  
Ensemble Mean ◽  
The Impact

Abstract Water security has been a major challenge in the semi-arid area of West Africa including Northern Ghana, where climate change is projected to increase if appropriate measures are not taken. This study assessed rainfall and temperature projections and its impact on the water resources in the Vea catchment using an ensemble mean of four bias-corrected Regional Climate Models and Statistical Downscaling Model-Decision Centric (SDSM-DC) simulations. The ensemble mean of the bias-corrected climate simulations was used as input to an already calibrated and validated Soil and Water Assessment Tool (SWAT) model, to assess the impact of climate change on actual evapotranspiration (ET), surface runoff and water yield, relative to the baseline (1990–2017) period. The results showed that the mean annual temperature and actual ET would increase by 1.3 °C and 8.3%, respectively, for the period 2020–2049 under the medium CO2 emission (RCP4.5) scenario, indicating a trend towards a dryer climate. The surface runoff and water yield are projected to decrease by 42.7 and 38.7%, respectively. The projected decrease in water yield requires better planning and management of the water resources in the catchment.

scholarly journals Separate and Combined Impacts of Land Cover and Climate Changes on Hydrological Responses of Dhidhessa River Basin, Ethiopia

2020 ◽  
Author(s):  
Gizachew Kabite ◽  
Misgana Muleta ◽  
Berhan Gessesse
Keyword(s):  
Climate Change ◽  
Land Cover ◽  
Groundwater Recharge ◽  
Land Cover Change ◽  
River Basin ◽  
Surface Runoff ◽  
Climate Changes ◽  
Negative Impacts ◽  
Hydrologic Responses ◽  
Soil And Water

Land cover and climate changes greatly influence hydrologic responses of a basin. However, the response vary from basin to basin depending on the nature and severity of the changes and basin characteristics. Moreover, the combined impacts of the changes affect hydrologic responses of a basin in an offsetting or synergistic manner. This study quantified the separate and combined impacts, and the relative contributions of land cover and climate changes on multiple hydrological regimes (i.e., surface runoff, streamflow, groundwater recharge evapotranspiration) for the Dhidhessa Subbasin. Land cover and climate change data were obtained from a recent study completed for the basin. Calibrated Soil and Water Analysis Tool (SWAT) was used to quantify the impacts. The result showed that SWAT model performed well for the Dhidhessa Subbasin in predicting the water balance components. Substantial land cover change as well as an increasing temperature and rainfall trends were reported in the river basin during the past three decades. In response to these changes, surface runoff, streamflow and actual evapotranspiration (AET) increased while groundwater recharge declined. Surface runoff was more sensitive to land cover than to climate changes whereas streamflow and AET were more sensitive to climate change than to land cover change. The combined impacts played offsetting effect on groundwater recharge and AET while inconsistent effects within study periods for other hydrologic responses. Overall, the predicted hydrologic responses will have negative impacts on agricultural production and water resources availability. Therefore, the implementation of integrated watershed management strategies such as soil and water conservation and afforestation could reverse the negative impacts.

scholarly journals Hydrological Alteration Index as an Indicator of the Calibration Complexity of Water Quantity and Quality Modeling in the Context of Global Change

Water ◽  
2019 ◽  
Vol 12 (1) ◽  
pp. 115 ◽  
Author(s):  
Roxelane Cakir ◽  
Mélanie Raimonet ◽  
Sabine Sauvage ◽  
Javier Paredes-Arquiola ◽  
Youen Grusson ◽  
...  
Keyword(s):  
Climate Change ◽  
Water Quality ◽  
Water Resources ◽  
Stream Water ◽  
Swat Model ◽  
Water Yield ◽  
Observation Data ◽  
Hydrological Alteration ◽  
Water Quality And Quantity ◽  
The Impact

Modeling is a useful way to understand human and climate change impacts on the water resources of agricultural watersheds. Calibration and validation methodologies are crucial in forecasting assessments. This study explores the best calibration methodology depending on the level of hydrological alteration due to human-derived stressors. The Soil and Water Assessment Tool (SWAT) model is used to evaluate hydrology in South-West Europe in a context of intensive agriculture and water scarcity. The Index of Hydrological Alteration (IHA) is calculated using discharge observation data. A comparison of two SWAT calibration methodologies are done; a conventional calibration (CC) based on recorded in-stream water quality and quantity and an additional calibration (AC) adding crop managements practices. Even if the water quality and quantity trends are similar between CC and AC, water balance, irrigation and crop yields are different. In the context of rainfall decrease, water yield decreases in both CC and AC, while crop productions present opposite trends (+33% in CC and −31% in AC). Hydrological performance between CC and AC is correlated to IHA: When the level of IHA is under 80%, AC methodology is necessary. The combination of both calibrations appears essential to better constrain the model and to forecast the impact of climate change or anthropogenic influences on water resources.

scholarly journals Hydrological Responses to Climate and Land Use Changes in a Watershed of the Loess Plateau, China

2019 ◽  
Vol 11 (5) ◽  
pp. 1443 ◽  
Author(s):  
Rui Yan ◽  
Yanpeng Cai ◽  
Chunhui Li ◽  
Xuan Wang ◽  
Qiang Liu
Keyword(s):  
Climate Change ◽  
Land Use ◽  
Water Balance ◽  
Loess Plateau ◽  
Climate Changes ◽  
Land Use Changes ◽  
Water Yield ◽  
The Loess Plateau ◽  
Runoff Water ◽  
Lulc Change

This study researched the individual and combined impacts of future LULC and climate changes on water balance in the upper reaches of the Beiluo River basin on the Loess Plateau of China, using the scenarios of RCP4.5 and 8.5 of the Fifth Assessment Report of the Intergovernmental Panel on Climate Change (IPCC). The climate data indicated that both precipitation and temperature increased at seasonal and annual scales from 2020 to 2050 under RCP4.5 and 8.5 scenarios. The future land use changes were predicted through the CA-Markov model. The land use predictions of 2025, 2035, and 2045 indicated rising forest areas with decreased agricultural land and grassland. In this study, three scenarios including only LULC change, only climate change, and combined climate and LULC change were established. The SWAT model was calibrated, validated, and used to simulate the water balance under the three scenarios. The results showed that increased rainfall and temperature may lead to increased runoff, water yield, and ET in spring, summer, and autumn and to decreased runoff, water yield, and ET in winter from 2020 to 2050. However, LULC change, compared with climate change, may have a smaller impact on the water balance. On an annual scale, runoff and water yield may gradually decrease, but ET may increase. The combined effects of both LULC and climate changes on water balance in the future were similar to the variation trend of climate changes alone at both annual and seasonal scales. The results obtained in this study provide further insight into the availability of future streamflow and can aid in water resource management planning in the study area.

scholarly journals STUDI HIDROLOGI BERDASARKAN CLIMATE CHANGES MENGGUNAKAN MODEL SWAT DI DAERAH TANGKAPAN AIR WADUK JATILUHUR

2015 ◽  
Vol 16 (2) ◽  
pp. 55
Author(s):  
Budi Darmawan Supatmanto ◽  
Sri Malahayati Yusuf
Keyword(s):  
Climate Change ◽  
Catchment Area ◽  
Climate Changes ◽  
Water Yield ◽  
Model Parameters ◽  
Hydrological Process ◽  
Coverage Area ◽  
Catchment Areas ◽  
The Impact ◽  
Total Coverage

Daerah Tangkapan waduk Jatiluhur berada diantara 107011'36” - 107032'36" BT and 6029'50" - 6040'45" LS di Jawa Barat, Indonesia. Area dengan luas 380 km2 merupakan 8% dari seluruh total area Hulu Sungai Citarum seluas 4500 km2. Fungsi dari daerah ini untuk memenuhi kebutuhan air untuk pertanian di Karawang dan Bekasi dan memenuhi kebutuhan air di Jakarta. Tujuan dari penelitian ini untuk meneliti dampak dari perubahan ik (Climate Changes) terhadap hasil hidrologi di daerah tangkapan. Perubahan iklim ditentukan oleh beberapa scenario perubahan iklim yang disiapkan sebagai input dalam SWAT hidrologi model. Simulasi dilakukan sesudah model dikalibrasi untuk mendapatkan parameter model yang sesuai dengan model hidrologi. Setelah itu model divalidasi untuk mengetahui bahwa model menggambarkan keadaan lapangan. hasil penelitian menunjukkan bahwa nilai-nilai limpasan dan hasil air yang bervariasi berdasarkan perubahan iklim. Oleh karena itu, perlu adanya untuk mempertimbangkan faktor-faktor perubahan iklim untuk mempelajari proses hidrologi di Daerah Tangkapan Air.Kata Kunci: SWAT, hidrologi, skenario perubahan iklim dan area tangkapan=Jatiluhur Reservoir Catchment Area is located between 107011'36” - 107032'36" BT and 6029'50" - 6040'45" LS in West Java, Indonesia. The catchment area embraces 380 km2, which is 8% of the total coverage area in the upstream of Citarum River with the total area of 4500 km2. The functions of this catchment are essential for meeting the needs of water for agriculture in Karawang and Bekasi area, and drinking water needs for Jakarta area. The purpose of this study was to investigate the impact of climate change on hydrology yield in the catchment. Changes in climate are discovered by several different climate changes scenarios, prepared as input for hydrological model SWAT. Simulation scenarios conducted after the model is calibrated in order to obtain model parameters that are sensitive to the hydrological response. Afterwards models are validated to find out that the model has described the state of the field. The result showed that the values of runoff and water yield are varies based on climate change. Therefore, there is a need to consider the factors of climate change in order to study hydrological process of a watershed.Keywords: SWAT, hydrology, climate changes scenarios and catchment areas.

scholarly journals Land-use and climate change effects on water yield from East African Forested Water Towers

2021 ◽  
Author(s):  
Charles Nduhiu Wamucii ◽  
Pieter R. van Oel ◽  
Arend Ligtenberg ◽  
John Mwangi Gathenya ◽  
Adriaan J. Teuling
Keyword(s):  
Land Use ◽  
Water Resources ◽  
Climate Changes ◽  
Land Use Changes ◽  
Water Yield ◽  
Mountain Regions ◽  
East African ◽  
Strong Shift ◽  
Climate Change Effects ◽  
Effects Of Land Use

Abstract. East-African forested mountain regions are vital in generating and supplying water resources to adjacent arid and semi-arid lowlands. However, these ecosystems are under pressure from both climate and land-use changes. This study aimed to analyze the effects of climate and land-use changes on water yield using the Budyko conceptual framework. For 9 selected forested water towers in East Africa, the amount and distribution of water resources and their decadal changes were analyzed. Results show that most areas inside and outside the water towers are under pressure from human influences. Water yield was observed to be more sensitive to climate changes compared to land-use changes within the selected East African water towers themselves. However, for the surrounding lowlands, the effects of land-use changes have greater impacts on water yield. We conclude that the East-African water towers have seen a strong shift towards wetter conditions, especially in the period of 2011–2019 while at the same time, the atmospheric demand is gradually increasing. Given that majority of the water towers were identified as non-resilient to these changes, future water yield is likely to also experience more extreme variations.

scholarly journals Application of SWAT model to Assess Land Use and Climate Changes Impacts on Hydrology of Nam Rom River Basin in Vietnam

2020 ◽  
Author(s):  
Son Ngo ◽  
Huong Hoang ◽  
Phuong Tran ◽  
Loc Nguyen
Keyword(s):  
Climate Change ◽  
Land Use ◽  
Ground Water ◽  
River Basin ◽  
Climate Changes ◽  
Swat Model ◽  
Land Use Changes ◽  
Hydrological Processes ◽  
Water Yield ◽  
Hydrological Process

Land use/land cover (LULC) and climate changes are two main factors directly affecting hydrologic conditions. However, very few studies in Vietnam have investigated changes in hydrological process under the impact of climate and land use changes on a basin scale. The objective of this study is to assess the individual and combined impacts of land use and climate changes on hydrological processes for the Nam Rom river basin, Northwestern Viet Nam using Remote Sensing (RS) and Soil and Water Assessment Tools (SWAT) model. SWAT model was used for hydrological process simulation. Results indicated that SWAT proved to be a powerful tool in simulating the impacts of land use and climate change on catchment hydrology. The change in historical land use between 1992 and 2015 strongly contributed to increasing hydrological processes (ET, percolation, ground water, and water yield), whereas, climate change led to significant decrease of all hydrological components. The combination of land use and climate changes significantly reduced surface runoff (-16.9%), ground water (-5.7%), water yield (-9.2%), and sediment load (-4.9%). Overall climatic changes had more significant effect on hydrological components than land use changes in the Nam Rom river basin during the 1992–2015. Under impacts of projected land use and climate change scenarios in 2030 on hydrological process of the upper Nam Rom river basin indicate that ET and surface flow are more sensitive to the changes in land use and climate in the future. In conclusion, the findings of this study will basic knowledge of the effects of climate and land-use changes on the hydrology for future development of integrated land use and water management practices in Nam Rom river basin.

scholarly journals Future climate changes under different scenarios and their effects on runoff in the upper Taohe River Basin

2021 ◽  
Author(s):  
zhen wang ◽  
Meixue Yang ◽  
xuejia wang ◽  
lizhen cheng ◽  
guoning wan ◽  
...  
Keyword(s):  
Climate Change ◽  
Water Resources ◽  
River Basin ◽  
Average Method ◽  
Climate Changes ◽  
Hydrological Model ◽  
Moving Average ◽  
Future Climate ◽  
Annual Average ◽  
The Future

Climate changes may pose challenges to water management. Simulation and projection of climate-runoff processes through hydrological models are essential means to assess the impact of global climate change on runoff variations. This study focuses on the upper Taohe River Basin which is an important water sources for arid and semi-arid regions in Northwest China. In order to assess the impacts of environmental changes, outputs from a regional climate model and the SWAT hydrological model were used to analyze the future climate change scenarios to water resources quantitatively. The examined climate changes scenarios results showed that average annual temperature from 2020 to 2099 in this area exhibits a consistent warming trend with different warming rates, at rates of 0.10°C/10a, 0.20°C /10a and 0.54°C /10a under RCP2.6, RCP4.5 and RCP8.5(Representative Concentration Pathways, RCPs), The value of precipitation experiences different trends under different emission scenarios. Under the RCP2.6, average precipitation would decrease at a rate of 3.69 mm/10a, while under the RCP4.5 and RCP8.5, it would increase at rates of 4.97 mm/10a and 12.28 mm/10a, respectively. The calibration and validation results in three in-site observations (Luqu, Xiabagou and Minxian) in the upper Taohe River Basin showed that SWAT hydrological model is able to produce an acceptable simulation of runoff at monthly time-step. In response to future climate changes, projected runoff change would present different decreasing trends. Under RCP2.6, annual average runoff would experience a progress of fluctuating trend, with a rate of-0.6×108m3 by 5-year moving average method; Under the RCP4.5 and RCP8.5, annual average runoff would show steadily increasing trends, with rates of 0.23×108m3 and 0.16×108m3 by 5-year moving average method. The total runoff in the future would prone to drought and flood disasters. Overall, this research results would provide a scientific reference for reginal water resources management on the long term.

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