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Environmental Effects of Natural Processes and Human Activities on the Water Environment in Watershed

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A special issue of Water (ISSN 2073-4441). This special issue belongs to the section "Water and Climate Change".

Deadline for manuscript submissions: 20 August 2024 | Viewed by 17531

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Prof. Dr. Guilin Han

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Guest Editor

Institute of Earth Sciences, China University of Geosciences (Beijing), Beijing 100083, China
Interests: hydrology; hydro-geochemistry; water chemistry; water quality; aquatic geochemistry; isotopic geochemistry
Special Issues, Collections and Topics in MDPI journals

Dr. Xiaolong Liu

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Guest Editor

Tianjin Key Laboratory of Water Resources and Environment, Tianjin Normal University, Tianjin 300387, China
Interests: water chemistry; environmental geochemistry; isotopic geochemistry; hydrogeochemistry

Special Issue Information

Dear Colleagues,

As an essential contributor to global biodiversity and ecological productivity, watershed aquatic ecosystems provide a broad range of services for all life on Earth, including water for drinking, irrigation, power generation and industry, biological habitat, and food and recreation places. However, the water environment and hydrology of the watershed have been increasingly threatened or changed, both directly and indirectly, by human activities and natural processes.

Globally, the environmental problems resulting from water and hydrology changes in watershed have been a cause for concern for over a century. In addition to water-quality deterioration, water environment changes such as eutrophication, pollutants exposure and migration, nutrients biogeochemical cycling, and greenhouse gas emissions in watershed are ongoing research hotspots, since they are essential to current water protection and management policymakers.

A watershed is the most important water-resource unit in the surface system, supporting social and economic development in most parts of the world. Despite the extensive time and financial resources dedicated to the identification of nonpoint sources of nutrients and pollutants in watersheds, many watersheds have not seen substantial improvement in water quality. Specific assessment of the fate and transformation of nutrients and other pollutants in different watershed scales and the influence of anthropogenic and natural processes remains critical. Considering hydrological changes in different-scale watershed, targeted studies of the cycling and transformation of the nutrients and pollutants under the influence of human activities and natural processes, and their environmental effects would provide useful implications for future watershed water environment and hydrology assessment and water management. Hydrologically, dam construction and changing the land use in the watershed, river impoundments for hydroelectric power generation and irrigation supply purposes alters or intercepts the nutrients and pollutants.

This Special Issue aims to present studies on water environment and hydrology changes in watershed under the influence of human activities and natural processes, and clarify the biogeochemical processes and influencing factors of the nutrients and pollutions in different watershed. This Special Issue intends to share innovative ideas from various perspectives within the field, and the topic could be addressed from several different viewpoints:

Watershed-scale transformation and migration mechanisms of nutrients and other pollutants influenced by human activities and natural progress.
Mechanisms of different kinds of water pollution and deterioration in watershed, including eutrophication, hypoxia, and greenhouse gas emissions.
Quantitative and qualitative identification of the contribution of potential sources of nutrients and pollutants.
Assessment of the environmental effects of human activities coupled with natural processes on biogeochemical cycling and transformations of nutrients and pollutants in watershed.

Prof. Dr. Guilin Han
Dr. Xiaolong Liu
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Water is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

watershed water environment
nutrient pollution
element cycle
source identification
agriculture
urban sewage
river impoundment
weathering
water-air interface
greenhouse gas emission

Published Papers (9 papers)

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Research

27 pages, 10717 KiB

Open AccessArticle

Sustaining the Pearl River: A Critical Review of Changes in Fluvial Geomorphological Processes and the Driving Forces in the Pearl River Basin

by Haidong Ou, Shirong Cai, Wei Fan, Junliang Qiu, Xiaolin Mu, Tao Zhou, Xiankun Yang and Lorenzo Picco

Water 2024, 16(7), 1001; https://doi.org/10.3390/w16071001 - 29 Mar 2024

Viewed by 707

Abstract

The Pearl River is one of China’s large rivers, the second-largest river and the fourth-longest river in China. Its unique geography, landform, and climate conditions create unique fluvial geomorphological processes. Affected by human activities and climate change, the fluvial geomorphological processes in the Pearl River Basin have undergone significant changes in recent decades, seriously affecting the river’s sustainable development. This paper critically reviews changes in fluvial geomorphological processes and analyzes influencing factors in the Pearl River Basin with a focus on possibilities for policy overhaul and strategic adjustments. Full article

(This article belongs to the Special Issue Environmental Effects of Natural Processes and Human Activities on the Water Environment in Watershed)

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13 pages, 5760 KiB

Open AccessArticle

Evolution Characteristics of Water Quality in Plain Reservoirs and Its Relationship with the Economic Development Response: A Case Study of Daheiting Reservoir in Northern China

by Budong Li, Kaiqi Chen, Xiaobo Liu, Chang Liu and Shiyan Wang

Water 2023, 15(18), 3229; https://doi.org/10.3390/w15183229 - 11 Sep 2023

Viewed by 876

Abstract

In order to explore the evolution characteristics of TP and NH₃-N in Daheiting reservoir since its construction, and their response to economic development, the monitoring data of water quality from 1992 to 2018 and statistical data of socio-economic development in Qianxi County were analyzed to examine the interannual evolution of TP and NH₃-N and their correlation with upstream water quality, various economic indicators, and the scale of cage fish culture. The results show that, influenced by economic development, the evolution process of TP and NH₃-N in Daheiting reservoir can be divided into three stages. In Stage I, the economic development of Qianxi County was slow, and the water quality of upstream water and the reservoir was good, with TP and NH₃-N concentrations remaining relatively stable. In Stage II, Qianxi County entered a period of rapid economic development, and the TP and NH₃-N in upstream water and Daheiting reservoir both increased significantly, with TP exceeding the standard limit. In Stage III, the intensity of external pollution control increased, and all cages were removed from the reservoir. Both TP and NH₃-N showed a downward trend, but TP still exceeded the standard limit. Pearson correlation analysis and RDA analysis revealed that the levels of TP and NH₃-N in Daheiting reservoir were mainly affected by the water quality of upstream water and the development of primary industry (including cage fish culture). Full article

(This article belongs to the Special Issue Environmental Effects of Natural Processes and Human Activities on the Water Environment in Watershed)

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14 pages, 7257 KiB

Open AccessArticle

Hydrochemical Characteristics, Water Quality, and Evolution of Groundwater in Northeast China

by Tao Zhang, Pei Wang, Jin He, Dandan Liu, Min Wang, Mingguo Wang and Shibin Xia

Water 2023, 15(14), 2669; https://doi.org/10.3390/w15142669 - 24 Jul 2023

Cited by 6 | Viewed by 1911

Abstract

Groundwater is vital to local human life and agricultural irrigation, and the quality of the water is critical to human health. As a result, it is critical to investigate the hydrochemical evolution and water quality of groundwater in the Sanjiang Plain. There were 259 samples obtained. Furthermore, hydrogeochemical simulation was performed to highlight groundwater’s hydrochemical features, evolution process, and water quality. The analytical results show that the groundwater in the study area is somewhat alkaline with a mean TDS of 285.94 mgL⁻¹ and the primary contributing ions being Ca²⁺ and HCO₃⁻. The closer the concentration of TDS and NO₃⁻ is to the city, the higher the concentration, indicating that the chemical composition of the water body has been affected by certain human activities. The Piper diagram, Gibbs diagram, and correlation analysis results demonstrate that the chemical type of groundwater is mostly HCO₃-Ca and the hydrochemistry is primarily regulated by weathering and carbonate and silicate dissolution. According to the entropy-weighted water quality index, the groundwater quality in this location is pretty acceptable. This study could help strengthen groundwater quality monitoring based on local conditions, identify the source of nitrate, provide data support for the safe use of local water resources, and serve as a reference for global water chemical evolution and water quality evaluation in cold regions. Full article

(This article belongs to the Special Issue Environmental Effects of Natural Processes and Human Activities on the Water Environment in Watershed)

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15 pages, 9790 KiB

Open AccessArticle

Distribution Characteristics and Genesis of Iron and Manganese Ions in Groundwater of Eastern Sanjiang Plain, China

by Mingguo Wang, Min Wang, Li Yang, Tao Yang, Jingjie Li and Yuanming Chen

Water 2023, 15(11), 2068; https://doi.org/10.3390/w15112068 - 30 May 2023

Cited by 3 | Viewed by 1676

Abstract

Groundwater resources are an essential component of global water resources. Long-term consumption of groundwater exceeding the standard levels for iron and manganese can lead to chronic diseases, posing a threat to human health. The Sanjiang Plain is the largest swamp wetland area in China and has high levels of iron and manganese in the groundwater, but the cause still needs to be clarified. Based on the results of water quality tests of 41 groundwater samples in the Eastern Sanjiang Plain, this paper analyzes the distribution characteristics and causes of iron and manganese from the perspectives of the original strata environment, redox conditions, pH conditions, and hydrochemical indicator factors in the research area, using statistical methods and GIS technology. The results show that high iron and manganese content in groundwater is prevalent in the Eastern Sanjiang Plain, and the exceedance rate of manganese is higher than that of iron (87.80% and 82.90%, respectively). The primary sources of iron and manganese in groundwater are iron and manganese minerals in the original strata environment. Influenced by factors such as acidic conditions, reducing environment, and rich organic matter, insoluble high-valent iron and manganese oxides are reduced to low-valent and soluble divalent iron and manganese. At the same time, groundwater’s high mineralization and evaporation concentration are conducive to increased iron and manganese content, while the influence of human activities is small. Full article

(This article belongs to the Special Issue Environmental Effects of Natural Processes and Human Activities on the Water Environment in Watershed)

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15 pages, 4235 KiB

Open AccessArticle

Hydrochemical Characteristics and Risk Assessment of Tongzi River, Guizhou Province, Southwest China

by Jiemei Lü and Yanling An

Water 2023, 15(4), 802; https://doi.org/10.3390/w15040802 - 18 Feb 2023

Cited by 2 | Viewed by 1745

Abstract

This study collected 31 water samples from the Tongzi River, Guizhou Province, Southwest China to conduct a risk assessment to understand the hydrochemical characteristics and major ion sources of irrigation and drinking water quality and their effects on human health. The results showed that ion abundance in the Tongzi River is Ca²⁺ (66%) > Mg²⁺ (24%) > K⁺+Na⁺ (10%) for cations and HCO₃⁻ (75%) > SO₄²⁻(21%) > Cl⁻ (4%) for anions. Additionally, the hydrochemical type of the water is Ca-Mg-HCO₃, controlled by carbonate weathering. Methods including ion ratios, principal component analysis (PCA), and correlation analysis (CA) were used to analyze the source of main ions in the river water. PC1, with the most significant variance (54.9%), decides the hydrochemical characteristics and is affected by the positive loadings of SO₄²⁻ (0.92), pH (0.85), Ca²⁺ (0.80), Cl⁻ (0.72), Na⁺(0.66), NO₃⁻ (0.65), and K⁺ (0.57). PC2 explains 19.2% of the total variance, with strong positive loadings of Na⁺ (0.75), K⁺ (0.63) and Cl⁻ (0.59). Mg²⁺ (0.84) and HCO₃⁻ (0.85) exhibits high loadings in PC3, explaining 9.3% of the variance. The results showed that intensive agricultural activities in the basin were the main source of nitrate NO₃⁻, whereas SO₄²⁻ was mainly derived from mining activities. The lower concentrations of Na⁺, K⁺, and Cl⁻ were from coal combustion, domestic wastewater discharge, and agricultural fertilizer applications. The study area was mainly affected by carbonate rock weathering; natural processes (mainly the weathering of carbonate rocks) were still the main origin of Ca²⁺, Mg²⁺, and HCO₃⁻. Moreover, the United States Salinity Laboratory (USSL) diagram and the Wilcox diagram showed that 100% of the samples fell in the C2S1 zones, and the water quality had good suitability for irrigation. The health risk assessment (HRA) results showed that HQ_NO₃⁻ was much larger than HQ_NH4+ and indicated that nitrate pollution dominated non-health hazards. About 6.5% of the samples in the tributaries represented an unacceptable risk for infants and children, and the HQ value for infants and children was always higher than that for adults. Additionally, the non-carcinogenic health risk of riverine ions for infants and children in the Tongzi River was very noteworthy, especially in the tributaries. Full article

(This article belongs to the Special Issue Environmental Effects of Natural Processes and Human Activities on the Water Environment in Watershed)

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16 pages, 18525 KiB

Open AccessArticle

Spatial Distribution and Sources of Rare Earth Elements in Urban River Water: The Indicators of Anthropogenic Inputs

by Xi Gao, Guilin Han, Jinke Liu and Shitong Zhang

Water 2023, 15(4), 654; https://doi.org/10.3390/w15040654 - 8 Feb 2023

Cited by 9 | Viewed by 2380

Abstract

Rare earth element (REE) concentrations in river water reflect both local geological background and the intensity of anthropogenic activities. The increasing demand for high-tech applications is accompanied by an increase in REEs in water environments, especially in urban regions. Therefore, the dissolved REEs in a typical urban river (Yongding River) were analyzed to reveal the influence of anthropogenic inputs. It was found that the sum of dissolved REE (ΣREE) concentrations in river water were 6.27~86.26 ng L⁻¹ (mean 31.05 ng L⁻¹). The spatial distribution of REEs is significantly affected by both natural processes and human activities. To eliminate the effect of upstream land use on downstream measurements, this study established a 500 m buffer zone alongside the river and identified the anthropogenic origin of REEs through correlations among land use proportions within the buffer zone, the population density, and REEs. The Post-Archean Australian Shale (PAAS)-normalized REEs revealed pronouncedly positive Gd anomalies in the range 0.30~20.16 in all river samples. Spearman correlation analysis indicated that the proportion of cultivated land was positively correlated with most of the REEs. A three-dimensional tracer system was established via Gd_anth, NO₃⁻/Na⁺ and Cl⁻/Na⁺ to characterize the impact of sewage treatment plants, hospitals and agricultural activities on river water. The results indicate that with the acceleration of urbanization, abnormal REEs can be considered as a sensitive indicator to assess the influence of anthropogenic activities on water ecosystems. Full article

(This article belongs to the Special Issue Environmental Effects of Natural Processes and Human Activities on the Water Environment in Watershed)

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19 pages, 3510 KiB

Open AccessArticle

Geochemistry and Sources Apportionment of Major Ions and Dissolved Heavy Metals in a Small Watershed on the Tibetan Plateau

by Wencong Xing, Lai Wei, Wenmin Ma, Jun Li, Xiaolong Liu, Jian Hu and Xiaoxia Wang

Water 2022, 14(23), 3856; https://doi.org/10.3390/w14233856 - 26 Nov 2022

Cited by 6 | Viewed by 1966

Abstract

Due to environmental sensibility and fragility, the water chemistry revolution and heavy metals accumulation influenced by natural and anthropogenic processes in the rivers on the Tibetan Plateau have recently become a global concern. However, targeted studies in small watersheds on the Tibetan Plateau are relatively limited. A study of surface waters in Duilong Qu (DLQ), a small watershed located on the Tibetan Plateau, have been conducted to assess the impact of natural and anthropogenic activities on the water environment of the DLQ by analyzing the major ions and heavy metals (Cd, Cr, Mn, Fe, Ni, Cu, Zn, Pb, and As) in the river waters. The results of the analysis of major ions showed that

{SO}_{4}^{2 -}

and

{HCO}_{3}^{-}

were the dominant anions and Ca²⁺ was the dominant cation, indicating that the water chemistry of the river waters was mainly of the HCO₃-Ca type. The results of Piper diagram and Gibbs diagram analysis indicate that the water solute is mainly controlled by the weathering of carbonate rocks, followed by the influence of geothermal water confluence. Compared to the world river average, the concentrations of Cr, Pb, and As in the studied rivers were relatively high. The heavy metal concentrations satisfy the standards of WHO and GB (Chinese national standard) guidelines. The PCA-APCS-MLR model has been employed and evidenced as a reliable tool to identify the sources of the heavy metals in this study. The results revealed that the heavy metals in the DLQ are caused by natural sources, geothermal water, and mining operations. The primary sources of As (93.63%), Cr (93.07%), Mn (73.53%), Fe (59.54%), and Pb (58.28%) in the DLQ were geothermal water, while Zn (91.41%), Mn (20.67%), Fe (40.46%), and Pb (26.15%) originated mainly from natural sources. Additionally, Cu (91.41%) was primarily influenced by mining operations, and Ni originated from mining (53.61%) and geothermal water sources (46.39%), while Cd (97.88%) originated from unknown sources. In the high-flow season periods from 1992 to 2017, the As concentrations in the DLQ decreased significantly, which might result from increasing precipitation and runoff. Overall, the results of this study suggest that both natural and anthropogenic activities have jointly affected the solutes in small rivers on the Tibetan Plateau, and heavy metal pollution should be emphasized in the future. Full article

(This article belongs to the Special Issue Environmental Effects of Natural Processes and Human Activities on the Water Environment in Watershed)

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22 pages, 5978 KiB

Open AccessArticle

Pollutants Source Assessment and Load Calculation in Baiyangdian Lake Using Multi-Model Statistical Analysis

by Guangwei Wang, Cuicui Lv, Congke Gu, Yang Yu, Zhenglun Yang, Zhixiong Zhang and Changyuan Tang

Water 2022, 14(21), 3386; https://doi.org/10.3390/w14213386 - 26 Oct 2022

Cited by 2 | Viewed by 1923

Abstract

Baiyangdian lake, the largest fresh lake on the Haihe Basin in North China, has attracted wide attention on account of the distinguished ecological water bodies in Xiong’an New Area. Although remarkable achievements have been made in pollution control in Baiyangdian lake, the problem facing the overall water environment remains serious. The complex pollutant sources, drastic pollutant flux changes, and the unclear impact of the role of pollutants pose great challenges to the water quality, water environment management, and long-term restoration of the ecological environment. Here, the potential pollution sources, their contribution ratio, and the influence of the pollution load of different sources on the water quality in the priority source areas of Baiyangdian lake are discussed in detail based on collected and existing monitoring data. It is proven that the primary pollution sources of for nitrogen, phosphorus, and organic pollutants are from agricultural and rural non-point source pollution; the load contribution rates exceed 50%, of which the contribution rate to the total phosphorus load reaches 73.37%. The total load contribution of runoff to the three pollutants was small, although the contribution of soil erosion to total nitrogen was 22.95%. The contribution of point source pollution to COD was high, with a rate of 22.33%. In order to ensure the environmental quality of Baiyangdian lake, it is obligatory to strengthen the control of agricultural and rural pollution discharge and to standardize the pollution discharge of livestock and poultry breeding. This study provides a helpful support for protecting the water ecology of the national Xiong’an New Area. Full article

(This article belongs to the Special Issue Environmental Effects of Natural Processes and Human Activities on the Water Environment in Watershed)

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16 pages, 4358 KiB

Open AccessArticle

Are UK Rivers Getting Saltier and More Alkaline?

by Shan Jiang, Xuan Wu, Sichan Du, Qin Wang and Dawei Han

Water 2022, 14(18), 2813; https://doi.org/10.3390/w14182813 - 9 Sep 2022

Cited by 6 | Viewed by 3055

Abstract

River salinisation and alkalinisation have become one of the major environmental problems threatening the safety of global freshwater resources. With the accelerated climate change and aggravating anthropogenic influences, it is important to identify the trends and causes of river salinisation and alkalinisation so that better mitigation measures could be taken. This study has focused on the UK rivers because there has been insufficient investigation on this topic. To understand the salinisation and alkalinisation trends and causes of rivers in the UK over the past 20 years from a vertical (analysis of each river) and horizontal (comparison of all rivers) perspective, this study uses the Theil-Sen regression and Mann-Kendall test to deal with the trends of conductivity (proxy on salinisation) and pH (proxy on alkalinisation), obtains outliers of conductivity and pH by boxplot, and calculates the Pearson’s and the Kendall’s Tau correlation coefficients (α = 0.05) between the water quality data and the potential factors (potential road salting, normalized difference vegetation index (NDVI), river discharge, agricultural and urban lands). The results show that the UK rivers are becoming more alkaline with a median pH increase of 0.05 to 0.40, but less salty with a median conductivity decrease of 0.06 to 0.11 mS/cm. And the changes in conductivity and pH have seasonality and regionality, which shows that there are usually greater changes in trends and medians of them in winter or through reaches with more anthropogenic disturbance. Furthermore, from a vertical perspective, the conductivity of more than 50% of rivers in this study is negatively correlated with NDVI and river discharge, and positively correlated with potential road salting, and the pH of that is positively correlated with agricultural lands. While from a horizontal perspective, NDVI and agricultural lands are positively correlated with pH, and potential road salting and urban lands are positively correlated with conductivity. Therefore, road salting, urbanisation, agricultural lands, river discharge and vegetation cover can be considered to affect river salinisation and alkalinisation in the UK. Full article

(This article belongs to the Special Issue Environmental Effects of Natural Processes and Human Activities on the Water Environment in Watershed)

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