scholarly journals Trends of Temperature and Rainfall in Pokhara

2020 ◽  
Vol 3 ◽  
pp. 22-32
Author(s):  
Upendra Paudel
Keyword(s):  
Water Resources ◽  
Human Activities ◽  
Climatic Condition ◽  
Air Pressure ◽  
Natural Processes ◽  
Increasing Trend ◽  
Average Condition ◽  
Meteorological Elements ◽  
Vital Element

 Climate is an average condition of temperature, humidity, air pressure, wind, precipitation and other meteorological elements. It is a changing phenomenon. Natural processes and human activities have helped change the climate. Temperature is a vital element of climate, which fluctuates in the course of time and leads to change other elements of the whole climate. An attempt has been made to analyze the pattern of temperature and rainfall of Pokhara with the help of the two decades’ temperature and rainfall conditions obtained from the station of Pokhara airport. The increasing trend of temperature and the decreasing trend of rainfall might be the symbol of climatic modification. This trend refers to some changes in the climatic condition that may affect water resources, vegetation, forests and agriculture.

scholarly journals Assessment of the Impacts of Climate Change and Human Activities on Runoff Using Climate Elasticity Method and General Circulation Model (GCM) in the Buqtyrma River Basin, Kazakhstan

2020 ◽  
Vol 12 (12) ◽  
pp. 4968 ◽  
Author(s):  
Moldir Rakhimova ◽  
Tie Liu ◽  
Sanim Bissenbayeva ◽  
Yerbolat Mukanov ◽  
Khusen Sh. Gafforov ◽  
...  
Keyword(s):  
Climate Change ◽  
Water Resources ◽  
Human Activities ◽  
General Circulation ◽  
Potential Evapotranspiration ◽  
Runoff Change ◽  
Runoff Changes ◽  
Increasing Trend ◽  
Rcp 8.5 ◽  
Downstream Area

The variations of climate and water resources in the Buqtyrma River Basin (BRB), which is located at the cross-section of the Altai Mountains, Eurasian Steppe and Tian Shan Mountains, have a great significance for agriculture and ecosystems in the region. Changing climatic conditions will change the hydrological cycle in the whole basin. In this study, we examined the historical trends and change points of the climate and hydrological variables, the contributions of climate change and human activities to runoff changes, and the relative changes in the runoff to the precipitation and potential evapotranspiration from 1950 to 2015 by using the Mann–Kendall trend test, Pettitt test, double cumulative curve and elasticities methods. In addition, a multi-model ensemble (MME) of the six general circulation models (GCMs) for two future periods (2036–2065 and 2071–2100) was assessed to estimate the spatio-temporal variations in precipitation and temperature under two representative concentration pathways (RCPs 4.5 and 8.5) scenarios. Our study detected that the runoff change-point occurred in 1982. The impacts induced by climate change on runoff change were as follows—70% in the upstream, 62.11% in the midstream and 15.34% in the downstream area. The impacts of human activity on runoff change were greater in the downstream area (84.66%) than in the upstream and midstream areas. A continuously increasing trend was indicated regarding average annual temperature under RCP 4.5 (from 0.37 to 0.33 °C/decade) and under RCP 8.5 (from 0.50 to 0.61 °C/decade) during two future periods. Additionally, an increasing trend in predicted precipitation was exhibited under RCP 4.5 (13.6% and 19.9%) and under RCP 8.5 (10.5% and 18.1%) during both future periods. The results of the relative runoff changes to the predicted precipitation and potential evapotranspiration were expected to increase during two future time periods under RCP 4.5 (18.53% and 25.40%) and under RCP 8.5 (8.91% and 13.38%) relative to the base period. The present work can provide a reference for the utilization and management of regional water resources and for ecological environment protection.

scholarly journals Simulating impact of over-grazing on grassland degradation using GIS: a case study in the Heihe River Basin, China

2019 ◽  
Vol 1 ◽  
pp. 1-2
Author(s):  
Bingyu Wang ◽  
Takashi Oguchi ◽  
Lin Zhang
Keyword(s):  
Sustainable Development ◽  
Water Resources ◽  
Human Activities ◽  
Arid Regions ◽  
River Basins ◽  
Heihe River ◽  
Grassland Degradation ◽  
Inland River ◽  
The Impact ◽  
The Heihe River Basin

<p><strong>Abstract.</strong> Inland river basins in arid to semi-arid regions are widely distributed in Northwest China, Central Asia, Central Australia, and North Africa, and are often subject to significant human activities. The most distinctive natural feature of such basins is the shortage of water resources, and the pivotal reasons involve less precipitation and heavy evapotranspiration (ET). In recent years, intensive human activities also damage the natural environment of the basins. They result in many problems especially the deterioration of ecological environment which will lead to severe consequences such as desertification, sandstorm, the disappearance of wetlands, reduction of forest and grassland degradation. They prevent us from achieving the goal of sustainable development. How to balance economic development and ecosystem conservation and to realize the sense of sustainability in inland river basins will be vitally important.</p><p>The Heihe River is the second largest inland river in the Northwest of China with a long history development by human (Figure 1). Water resources from the river are crucial not only for the ecosystem but also for local human societies. The Heihe River Basin (HRB) is divided into three zones with different landscapes and natural environments. The upstream of HRB is the headstream which generates water resources mainly from glaciers and snow in Qilian Mountain. A large population of nomadic national minorities inhabits here and keeps animal husbandry as the primary production activity. In the early times, the Chinese government encouraged production activities to stimulate economic growth, and significant over-grazing and resultant severe grassland degradation occurred. Grassland is crucial for maintaining water resources especially in arid regions, without grasses most water will quickly evaporate into the air. Therefore, land resource management about grassland and the impact of human activities on the natural environment are of high research value in the HRB.</p><p>This research aims to investigate the impact of over-grazing on grassland degradation in the inland ecosystem of the HRB. The changes of grassland distribution were simulated under different over-grazing scenarios to provide a reference for resource management and the related decision-making process and to contribute to the sustainable development of the region.</p>

scholarly journals FAKTOR-FAKTOR PENYEBAB TERJADINYA PENCEMARAN AIR DI SUNGAI BINDU

2021 ◽  
Vol 3 (2) ◽  
pp. 122-135
Author(s):  
I Wayan Eka Artajaya, Ni Kadek Felyanita Purnama Putri
Keyword(s):  
Water Pollution ◽  
Water Resources ◽  
Natural Resources ◽  
Human Activities ◽  
Human Life ◽  
Surrounding Environment ◽  
Living Things ◽  
Renewable Natural Resources

Indonesia is a very large and wide country, consisting of many islands and abundant natural resources. Natural resources in Indonesia are everything that comes from nature that is used to meet the needs of human life. Generally, natural resources in Indonesia can be classified based on their nature, namely renewable natural resources and non-renewable natural resources. Humans are very dependent on natural resources and the sustainability of natural resources is strongly influenced by human activities. Watershed is one of the natural resources that is very complex and consists of various components that make it up. The functions and benefits of water resources themselves, including rivers, require various efforts to improve and protect water so that it is efficient and effective for living things and the surrounding environment. One of them is the Bindu river in the Kesiman Traditional Village. The Bindu River is widely used by the community, causing water pollution in the Bindu river, such as the Kesiman Traditional Village which has an important role in suppressing the occurrence of water pollution that occurs in the Bindu river.   Negara Indonesia merupakan negara yang sangat besar dan luas, terdiri dari banyak pulau dan sumber daya alam yang melimpah. Sumber daya alam di Indonesia merupakan segala sesuatu yang berasal dari alam yang digunakan untuk memenuhi kebutuhan hidup manusia. Umumnya sumber daya alam di Indonesia dapat digolongkan berdasarkan sifatnya yaitu sumber daya alam yang dapat diperbaharui dan sumber daya alam yang tidak dapat diperbaharui. Manusia sangat bergantung pada sumber daya alam dan kelestarian sumber daya alam sangat dipengaruhi oleh aktivitas manusia. Daerah aliran sungai merupakan salah satu sumber daya alam yang sangat kompleks dan terdiri dari berbagai komponen yang menyusunnya. Fungsi dan manfaat sumber daya air sendiri termasuk sungai memerlukan berbagai upaya untuk peningkatan dan perlindungan air agar berdaya guna dan berhasil guna bagi makhluk hidup dan lingkungan sekitar. Salah satunya adalah sungai Bindu yang berada di Desa Adat Kesiman. Sungai Bindu banyak dimanfaatkan oleh masyarakat sehingga menyebabkan terjadinya pencemaran air di sungai Bindu, seperti Desa Adat Kesiman memiliki peranan penting dalam menekan terjadinya pencemaran air yang terjadi di sungai Bindu.

Fluvial sediment fluxes response to modern climate change and human activities in the Tibetan Plateau and its margins

2021 ◽  
Author(s):  
Dongfeng Li ◽  
Xixi Lu ◽  
Ting Zhang
Keyword(s):  
Climate Change ◽  
Water Resources ◽  
Tibetan Plateau ◽  
Air Temperature ◽  
Human Activities ◽  
Sediment Flux ◽  
The Tibetan Plateau ◽  
Fluvial Sediment ◽  
Sediment Fluxes ◽  
Cold Environments

&lt;p&gt;Sediment flux in cold environments is a crucial proxy to link glacial, periglacial, and fluvial systems and highly relevant to hydropower operation, water quality, and the riverine carbon cycle. However, the long-term impacts of climate change and multiple human activities on sediment flux changes in cold environments remain insufficiently investigated due to the lack of monitoring and the complexity of the sediment cascade. Here we examine the multi-decadal changes in the in-situ observed fluvial sediment fluxes from two types of basins, namely, pristine basins and disturbed basins, in the Tibetan Plateau and its margins. The results show that the fluvial sediment fluxes in the pristine Tuotuohe headwater have substantially increased over the past three decades (i.e., a net increase of 135% from 1985&amp;#8211;1997 to 1998&amp;#8211;2017) due to the warming and wetting climate. We also quantify the relative impacts of air temperature and precipitation on the increases in the sediment fluxes with a novel attribution approach and finds that climate warming and intensified glacier-snow-permafrost melting is the primary cause of the increased sediment fluxes in the pristine cold environment (Tuotuohe headwater), with precipitation increase and its associated pluvial processes being the secondary driver. By contrast, the sediment fluxes in the downstream disturbed Jinsha River (southeastern margin of the Tibetan Plateau) exhibit a net increase of 42% from 1966-1984 to 1985-2010 mainly due to human activities such as deforestation and mineral extraction (contribution of 82%) and secondly because of climate change (contribution of 18%). Then the sediment fluxes dropped by 76% during the period of 2011-2015 because of the operations of six cascade reservoirs since 2010. In an expected warming and wetting climate for the region, we predict that the sediment fluxes in the pristine headwaters of the Tibetan Plateau will continue to increase throughout the 21st century, but the rising sediment fluxes from the Tibetan Plateau would be mostly trapped in its marginal reservoirs.&lt;/p&gt;&lt;p&gt;Overall, this work has provided the sedimentary evidence of modern climate change through robust observational sediment flux data over multiple decades. It demonstrates that sediment fluxes in pristine cold environments are more sensitive to air temperature and thermal-driven geomorphic processes than to precipitation and pluvial-driven processes. It also provides a guide to assess the relative impacts of human activities and climate change on fluvial sediment flux changes and has significant implications for water resources stakeholders to better design and manage the hydropower dams in a changing climate. Such findings may also have implications for other cold environments such as the Arctic, Antarctic, and other high mountainous basins.&lt;/p&gt;&lt;p&gt;Furthermore, this research is under the project of &quot;Water and Sediment Fluxes Response to Climate Change in the Headwater Rivers of Asian Highlands&quot; (supported by the IPCC and the Cuomo Foundation) and the project of &quot;Sediment Load Responses to Climate Change in High Mountain Asia&quot; (supported by the Ministry of Education of Singapore). Part of the results are also published in Li et al., 2018 Geomorphology, Li et al., 2020 Geophysical Research Letters, and Li et al., 2021 Water Resources Research.&lt;/p&gt;

scholarly journals Impact of Climate Variabilities and Human Activities on Surface Water Extents in Reservoirs of Yongding River Basin, China, from 1985 to 2016 Based on Landsat Observations and Time Series Analysis

2019 ◽  
Vol 11 (5) ◽  
pp. 560 ◽  
Author(s):  
Mingli Wang ◽  
Longjiang Du ◽  
Yinghai Ke ◽  
Maoyi Huang ◽  
Jing Zhang ◽  
...  
Keyword(s):  
Time Series ◽  
Surface Water ◽  
Water Resources ◽  
River Basin ◽  
Change Point ◽  
Human Activities ◽  
Reservoir Water ◽  
Change Period ◽  
Statistical Time ◽  
Yongding River

Yongding River is the largest river flowing through Beijing, the capital city of China. In recent years, Yongding River Basin (YDRB) has witnessed increasing human impacts on water resources, posing serious challenges in hydrological and ecological health. In this study, remote sensing techniques and statistical time series approaches for hydrological studies were combined to characterize the dynamics and driving factors of reservoir water extents in YDRB during 1985–2016. First, 107 Landsat 4, 5, 7 and 8 images were used to extract surface water extents in YDRB during 1985–2016 using a combination of water indices and Otsu threshold algorithm. Significant positive correlation was found between water extents and the annual inflow for the two biggest reservoirs, the downstream Guanting and upstream Cetian reservoirs, proving their representativeness of surface water availability in this basin. Then, statistical time series approaches including trend-free pre-whitening Mann-Kendall trend test, Pettit change-point test and double mass curve method, which are frequently used in hydrological studies, were adopted to quantify the trend of reservoir water extents dynamics and the relative contributions of climate variability and human activities. Results showed that the water extents in both reservoirs exhibited significant downward trend with change point occurring in 2001 and 2005 for Guanting and Cetian, respectively. About 74%~75% of the shrinkage during the post-change period can be attributed to human activities, among which GDP, population, electricity power production, raw coal production, steel and crude iron production, value of agriculture output, and urban area were the major human drivers. Hydrological connectivity between the upstream Cetian and downstream Guanting reservoirs declined during the post-change period. Since 2012, water extents in both reservoirs recovered as a result of various governmental water management policies including the South-to-North Water Diversion Project. The methodology presented in this study can be used for analyzing the dynamics and driving mechanism of surface water resources, especially for un-gauged or poorly-gauged watersheds.

scholarly journals Major groundwater reservoir nr 112 in the coast of Gdańsk Bay

2018 ◽  
Vol 54 ◽  
pp. 00015
Author(s):  
Zbigniew Kordalski ◽  
Andrzej Sadurski
Keyword(s):  
Water Management ◽  
Water Resources ◽  
Human Activities ◽  
Groundwater Resources ◽  
Physical Planning ◽  
Groundwater Reservoir ◽  
Water Resources Protection

The main groundwater reservoirs (MGR) in Poland have been established during last 9 years and finished in 2017 yr. (Mikołajków, Sadurski edit.). The most reach in groundwater resources hydrogeological structures in the country where deliminated and the scope of limited and forbidden human activities for their protection where established. Area of main groundwater reservoir nr 112 , named - Żuławy Gdańskie - comprises predominantly City of Gdańsk and area of Gdańsk and Pruszcz Gdański Counts and slightly exceeds 100 km2. The area undertaken for the investigation and modelling was 363.8 km2. The aim of MGR delimitation and hydrogeological documentation was the water resources protection based on physical planning proper, responsible water management (Herbich et al., 2009). The methods of hydrogeological researches, groundwater resources calculation and delimitation of MGR is presented in the paper.

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