scholarly journals The Response of Groundwater Level to Climate Change and Human Activities in Baotou City, China

Water ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 1078
Author(s):  
Yingjie Cui ◽  
Zilong Liao ◽  
Yongfu Wei ◽  
Xiaomin Xu ◽  
Yifan Song ◽  
...  
Keyword(s):  
Climate Change ◽  
Human Activities ◽  
Groundwater Resources ◽  
Reduction Rate ◽  
Northern China ◽  
Groundwater Depth ◽  
Wavelet Coherence ◽  
Confined Water ◽  
Groundwater Exploitation ◽  
Decrease Rate

The response mechanism of groundwater to climate change and human activities in cities within arid and semi-arid regions, such as the Urban Planning Area of Baotou City (UPABC), northern China, is a complicated problem to understand. We analyzed the climate change relationships, including precipitation and temperature, and analyzed changes in human activities, such as groundwater consumption, and then statistically analyzed the main factors affecting groundwater depth. Furthermore, cross-wavelet and wavelet coherence methods were used to analyze the response relationship and hysteresis of groundwater depth to precipitation to better understand the groundwater depth response law. The results showed that the annual precipitation in the UPABC reduction rate was 3.3 mm/10 yr, and the annual average temperature increase rate was 0.43 °C/10 yr, from 1981 to 2017. The unconfined water decrease rate was 0.50 m/yr, and the confined water decrease rate was 0.7 m/yr. The unconfined and confined water depths were affected by precipitation and groundwater exploitation, respectively, with correlation coefficients of 0.58 and 0.57, respectively. The hysteresis of groundwater depth to precipitation was about 9–14 months. However, changes in groundwater depth, especially confined water depth, were greatly affected by groundwater exploitation. This reflected the imbalance in consumption and recharges in the UPABC, highlighting the long-term risk in areas relying on access to this resource. Therefore, arid inland zones of northern China, such as the UPABC, should pay more attention to the rational development of groundwater and strengthen the management and protection of groundwater resources.

scholarly journals A framework for quantifying the impacts of climate change and human activities on hydrological drought in a semiarid basin of Northern China

2019 ◽  
Vol 33 (7) ◽  
pp. 1075-1088 ◽  
Author(s):  
Shanhu Jiang ◽  
Menghao Wang ◽  
Liliang Ren ◽  
Chong‐Yu Xu ◽  
Fei Yuan ◽  
...  
Keyword(s):  
Climate Change ◽  
Human Activities ◽  
Northern China ◽  
Hydrological Drought ◽  
Impacts Of Climate Change

scholarly journals Direct or indirect recharge on groundwater in the middle-latitude desert of Otindag, China?

2018 ◽  
Author(s):  
Bing-Qi Zhu ◽  
Xiao-Zong Ren ◽  
Patrick Rioual
Keyword(s):  
Asian Summer Monsoon ◽  
Groundwater Resources ◽  
Atmospheric Precipitation ◽  
Middle Latitude ◽  
Northern China ◽  
Suture Zone ◽  
Mountain Areas ◽  
Fresh Groundwater ◽  
Groundwater Exploitation ◽  
Desert Zone

Abstract. The Otindag Desert in the middle-latitude desert zone of northern Hemisphere (NH) is essential to livestock-economy and ecoenvironment of northern China. Many areas in this zone are unexpectedly rich with groundwater resources although they have been under arid or hyper-arid climate for a long time. Widespread fresh groundwater deep to 60 m was found at the eastern part of the Otindag Desert. The occurrence of this massive fresh groundwater raises doubts on the long-lasting hypothesis in academic circles that regional atmospheric precipitation or palaeowater, namely the direct recharge, is the source of water in the middle-latitude desert aquifers of northern China. Understanding of the recharge of this fresh groundwater is important in evaluating the feasibility of groundwater exploitation and utilization. In this study we conducted hydrogeochemical and isotopical analyses to assess possible origin and recharge of these groundwaters. The analytical results indicate that the fresh groundwater is neither originated from regional atmospheric precipitation derived from the Asian Summer Monsoon system, nor from palaeowater that formed during the last glacial period. These findings suggest that the groundwater in this desert is possible to originate from remote mountain areas via the faults of the Solonker Suture zone, including the Daxing’Anlin and Yinshan Mountains. In addition, it is concluded that the hygeodrological linkage between desert aquifers and mountain systems through the suture zone is crucial to the hydrological functioning of the Otindag aquifer. This suggests that the modern indirect recharge mechanism, instead of the direct recharge and the palaeo-water recharge, is the most significant for groundwaterrecharge in the Otindag Desert. This study provides a new perspective into the origin and evolution of groundwater resources in the middle-latitude desert zone of HA.

scholarly journals Assessment of groundwater quantitative vulnerability to climate change in Slovenia

Geologija ◽  
2021 ◽  
Vol 64 (1) ◽  
pp. 81-94
Author(s):  
Jože UHAN ◽  
Mišo ANDJELOV
Keyword(s):  
Climate Change ◽  
Groundwater Recharge ◽  
Adaptive Capacity ◽  
Groundwater Resources ◽  
Groundwater Vulnerability ◽  
Adaptive Planning ◽  
Groundwater Exploitation ◽  
Vulnerability To Climate Change ◽  
Potential Impact ◽  
Negative Impacts

Assessment ofthe potential impact of climate change on groundwater recharge and availability of groundwater resources is as essential in Slovenia as it is elsewhere. Adaptive planning is of immense importance when aiming for reduction of negative impacts, even more so in areas with the highest groundwater exploitation levels and the lowest adaptive capacity. We have assessed quantitative groundwater vulnerability to climate change through potential impact and adaptive capacity indicators for all groundwater bodies in Slovenia. High and moderatly high quantitative groundwater vulnerability can be observed in merely 9 % of Slovenian territory. The highest quantitative vulnerability was accounted to shallow alluvial groundwater bodies in the northeastern part of the country, where the annual change in groundwater recharge due to climate change until the middle of this century is expected to represent more than a quarter of the current average annual groundwater extraction.

scholarly journals Mechanism of Land Subsidence Mutation in Beijing Plain under the Background of Urban Expansion

2021 ◽  
Vol 13 (16) ◽  
pp. 3086
Author(s):  
Lin Guo ◽  
Huili Gong ◽  
Yinghai Ke ◽  
Lin Zhu ◽  
Xiaojuan Li ◽  
...  
Keyword(s):  
Water Level ◽  
Land Subsidence ◽  
Human Activities ◽  
Urban Expansion ◽  
Regional Scale ◽  
Confined Water ◽  
Groundwater Exploitation ◽  
Beijing Plain ◽  
Subsidence Rate ◽  
Geological Conditions

Under the background of over-exploitation of groundwater and urban expansion, the land subsidence in the Beijing Plain has dramatically increased recently, and has demonstrated obvious mutation characteristics. Firstly, this paper used the land-use transfer matrix (LUTM) to quantify the urban expansion of Beijing, from 1990 to 2015. Secondly, the gravity center migration model (GCM) and standard deviation ellipse (SDE) methods were employed in order to quantitatively reveal the response relationship between urban expansion and land subsidence in the study area. Finally, the research innovatively combines multi-disciplinary (remote sensing, geophysical prospecting, spatial analysis, and hydrogeology), to analyze the mechanism of land subsidence mutation in the Beijing Plain, at multiple scales. The results showed the following: 1. The development direction of the urban expansion and the subsidence bowl (subsidence rate > 50 mm/year) were highly consistent, with values of 116.8° and 113.3°, respectively. 2. At the regional scale, the overall spatial distribution of subsidence mutations is controlled by the geological conditions, and the subsidence mutation time was mainly in 2005 and 2015. The area where mutation occurred in 2005 was basically located in the subsidence bowls, and the correlation between the confined water level and the subsidence rate was relatively high (r > 0.62). The area where the settlement mutation occurred in 2015, was mainly located outside the subsidence bowls, and the correlation between the confined water level and the subsidence rate was relatively low (r < 0.71). 3. In the typical subsidence area, the subsidence mutation occurred mostly in the places where the stratigraphic density is reduced, due to human activities (such as groundwater exploitation). Human activities caused the reduction in stratigraphic density, at 20 m and 90 m vertical depth in urban and rural areas, respectively. 4. At the local scale, clusters of subsidence mutation were located in the fault buffer zone, with a lateral influence range of nearly 1 km in Tongzhou. The scattered settlement mutation is distributed as a spot pattern, and the affected area is relatively small, which basically includes high-rise buildings.

scholarly journals Probabilistic analysis of the controls on groundwater depth using Copula Functions

2020 ◽  
Vol 51 (3) ◽  
pp. 406-422 ◽  
Author(s):  
Yifei Bai ◽  
Yi Wang ◽  
Yaning Chen ◽  
Leyuan Zhang
Keyword(s):  
Water Table ◽  
Joint Distribution ◽  
Time Series Data ◽  
Groundwater Resources ◽  
Distribution Functions ◽  
Groundwater Depth ◽  
Irrigation District ◽  
Series Data ◽  
Copula Functions ◽  
Groundwater Exploitation

Abstract Groundwater is an essential water resource in the Yarkant River Basin Irrigation District, which is the largest oasis in Xinjiang, China. This study used a novel approach to analyze the relationship between groundwater depth and three driving factors by developing Copula Functions from monthly time series data collected from 16 monitoring wells. More specifically, marginal distribution and joint distribution functions were established, and the conditional probabilities for three data ranges were calculated using both two- and three-dimensional Copula Functions. The developed statistical models showed that groundwater exploitation, runoff, and surface water irrigation significantly affected groundwater depth. The most significant effect on water table declines was associated with groundwater exploitation and lagged 1-month behind the groundwater withdrawals. The amount of runoff and irrigation were both inversely related to water table depth due to groundwater recharge. Frank Copula Functions were found to produce the best fit to the joint distribution of the variables and were used herein, allowing for the establishment of a detailed probability distribution of the change in groundwater depth under the combined effect of multiple controlling factors. The results provided key insights into how irrigation and groundwater withdrawals can be adjusted to effectively manage groundwater resources.

scholarly journals Quantitative analysis on sensitive factors of runoff change in Fenhe watershed based on integration approach

2018 ◽  
Vol 379 ◽  
pp. 371-380 ◽  
Author(s):  
Deng Wang ◽  
Shengqi Jian ◽  
Zening Wu ◽  
Zhaoxi Zhang ◽  
Caihong Hu
Keyword(s):  
Climate Change ◽  
Water Resources ◽  
Human Activities ◽  
Yellow River ◽  
Shanxi Province ◽  
The Yellow River ◽  
Groundwater Exploitation ◽  
Total Reduction ◽  
Runoff Change ◽  
The Impact

Abstract. The runoff of the Fenhe River flowed into the Yellow River (RRY) is reducing significantly due to the influence of climate change and human activities. It is generating bad situation of shortage of water resources and led to the deterioration of ecological environment of Shanxi Province. At the same time, the reduction in RRY causes the runoff reduction in Yellow River and exacerbated the water resources shortage of the middle area of the Yellow River. Therefore, it is important to alleviate water shortage and develop the soil and water conservation measurements and regional water policy by analyzing the influence of human activities and climate change on the RRY. The existing study quantified the reduction in amount of RRY which caused by human activities and climate change using statistical methods and watershed hydrological model. The main results of the study were as follow: Using hydrological variation diagnosis system, the variation characteristics of long time series of measured annual runoff were analyzed in Hejin station that is the Fenhe River control station. The results showed that the runoff of Fenhe River run into Yellow River declined year by year, in 1971, fell the most obviously. The impact of LUCC on runoff was calculated using the method of area ratio in the Fenhe River basin. Human activities were major factor in the reduction of RRY than the climate change, contributed 83.09 % of the total reduction in RRY, Groundwater exploitation gave the greatest contribution to the decrease in RRY in the scope of several kinds of human activity (30.09 %), followed by coal mining (26.03 %), climate changed contributed 19.17 % of the total reduction of RRY, and the decrease of precipitation contributed 20.81 %. But the variation of air temperature and wind speed would result in the increase of the amount of RRY.

scholarly journals Seasonal and Inter-Annual Variability of Groundwater and Their Responses to Climate Change and Human Activities in Arid and Desert Areas: A Case Study in Yaoba Oasis, Northwest China

Water ◽  
2020 ◽  
Vol 12 (1) ◽  
pp. 303 ◽  
Author(s):  
Huanhuan Li ◽  
Yudong Lu ◽  
Ce Zheng ◽  
Xiaonan Zhang ◽  
Bao Zhou ◽  
...  
Keyword(s):  
Climate Change ◽  
Groundwater Level ◽  
Human Activities ◽  
Climatic Factors ◽  
Groundwater Resources ◽  
Principal Component ◽  
Northwest China ◽  
Warming Trend ◽  
Trend Test ◽  
Quantitative Calculation

Climate change and human activities have profound effects on the characteristics of groundwater in arid oases. Analyzing the change of groundwater level and quantifying the contributions of influencing factors are essential for mastering the groundwater dynamic variation and providing scientific guidance for the rational utilization and management of groundwater resources. In this study, the characteristics and causes of groundwater level in an arid oasis of Northwest China were explored using the Mann–Kendall trend test, Morlet wavelet analysis, and principal component analysis. Results showed that the groundwater level every year exhibited tremendous regular characteristics with the seasonal exploitation. Meanwhile, the inter-annual groundwater level dropped continuously from 1982 to 2018, with a cumulative decline depth that exceeded 12 m, thereby causing the cone of depression. In addition, the monthly groundwater level had an evident cyclical variation on the two time scales of 17–35 and 7–15 months, and the main periodicity of monthly level was 12 months. Analysis results of the climatic factors from 1954 to 2018 observed a significant warming trend in temperature, an indistinctive increase in rainfall, an inconspicuous decrease in evaporation, and an insignificant reduction in relative humidity. The human factors such as exploitation amount, irrigated area, and population quantity rose substantially since the development of the oasis in the 1970s. In accordance with the quantitative calculation, human activities were decisive factors on groundwater level reduction, accounting for 87.79%. However, climate change, including rainfall and evaporation, which contributed to 12.21%, still had the driving force to change the groundwater level in the study area. The groundwater level of Yaoba Oasis has been greatly diminished and the ecological environment has deteriorated further due to the combined effect of climate change and human activities.

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