Characterizing spatial and temporal variation in 18 O and 2 H content of New Zealand river water for better understanding of hydrologic processes

2020 ◽  
Vol 34 (26) ◽  
pp. 5474-5488
Author(s):  
Jing Yang ◽  
Bruce D. Dudley ◽  
Kelsey Montgomery ◽  
Will Hodgetts
Keyword(s):  
New Zealand ◽  
Temporal Variation ◽  
River Water ◽  
Spatial And Temporal Variation ◽  
Hydrologic Processes

scholarly journals Spatio-temporal variation analysis of hydrochemical characteristics in the Luanhe River Basin, China

2013 ◽  
Vol 67 (6) ◽  
pp. 1332-1338 ◽  
Author(s):  
Ying Xie ◽  
Xuyong Li ◽  
Huiliang Wang ◽  
Wenzan Li
Keyword(s):  
Water Pollution ◽  
Water Quality ◽  
Temporal Variation ◽  
River Water ◽  
River Basin ◽  
Pollution Control ◽  
Spatial And Temporal Variation ◽  
Hydrochemical Characteristics ◽  
Water Pollution Control ◽  
Luanhe River Basin

The analysis of river pollution and assessment of spatial and temporal variation in hydrochemistry are essential to river water pollution control in the context of rapid economic growth and growing pollution threats in China. In this study, we focused on hydrochemical characteristics of the Luanhe River Basin (China) and evaluation of 12 hydrochemical variables obtained from 32 monitoring stations during 2001–2010. In each study year, the streams were monitored in the three hydrological periods (April, August, and October) to observe differences in the impacts of agricultural activity and rainfall pattern. Multivariate statistical methods were applied to the data set, and the river water hydrochemical characteristics were assessed using the water quality identification index (WQIIM). The results showed that parameters had variable contribution to water quality status in different months except for ammonia nitrogen (NH4-N) and total nitrogen (TN), which were the most important parameters in contributing to water quality variations for all three periods. Results of WQIIM revealed that 18 sites were classified as 'meeting standard' while the other 14 sites were classified as 'not meeting standard', with most of the seriously polluted sites located in urban area, mainly due to discharge of wastewater from domestic and industrial sources. Sites with low pollution level were located primarily in smaller tributaries, whereas sites of medium and high pollution levels were in the main river channel and the larger tributaries. Our findings provide valuable information and guidance for water pollution control and water resource management in the Luanhe River Basin.

Evaluation of spatial and temporal variation in Karun River water quality during five decades (1968-2014)

2017 ◽  
Vol 27 (2) ◽  
pp. 71-75 ◽  
Author(s):  
Mehdi Ahmadmoazzam ◽  
Amal Saki Malehi ◽  
Sahand Jorfi ◽  
Bahman Ramavandi ◽  
Mehdi Ahmadi
Keyword(s):  
Water Quality ◽  
Temporal Variation ◽  
River Water ◽  
River Water Quality ◽  
Spatial And Temporal Variation ◽  
Karun River

scholarly journals Spatial and temporal variation in tree seed production and dispersal in a New Zealand temperate rainforest

Ecosphere ◽  
2014 ◽  
Vol 5 (4) ◽  
pp. art49 ◽  
Author(s):  
Charles D. Canham ◽  
Wendy A. Ruscoe ◽  
Elaine F. Wright ◽  
Deborah J. Wilson
Keyword(s):  
New Zealand ◽  
Temporal Variation ◽  
Seed Production ◽  
Spatial And Temporal Variation ◽  
Temperate Rainforest ◽  
Tree Seed

scholarly journals Assessment of Water Quality Using Chemometrics and Multivariate Statistics: A Case Study in Chaobai River Replenished by Reclaimed Water, North China

Water ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 2551
Author(s):  
Yilei Yu ◽  
Xianfang Song ◽  
Yinghua Zhang ◽  
Fandong Zheng
Keyword(s):  
Water Quality ◽  
Stable Isotope ◽  
Temporal Variation ◽  
River Water ◽  
Water Reuse ◽  
North China ◽  
Reclaimed Water ◽  
Spatial And Temporal Variation ◽  
Water Quality Criteria ◽  
Rock Interaction

Dry rivers could be effectively recovered by reclaimed water in North China, while river water quality would be an important issue. Therefore, it is important to understand the spatiotemporal variation and controlling factors of river water. Water samples were collected during March, May, July, September, and November in the year 2010, then 20 parameters were analyzed. The water environment was oxidizing and alkaline, which was beneficial for nitrification. Nitrate was the main nitrogen form. Depleted and enriched isotopes were found in reclaimed water and river water, respectively. Total nitrogen (TN) and total phosphorus (TP) of reclaimed water exceed the threshold of reclaimed water reuse standard and Class V in the surface water quality criteria. Most river water was at the severe eutrophication level. The sodium adsorption ratio indicated a medium harmful level for irrigation purpose. Significant spatial and temporal variation was explored by cluster analysis. Five months and nine stations were both classified into two distinct clusters. It was found that 6 parameters (chloride: Cl−, sulphate: SO42−, potassium: K+, sodium: Na+, magnesium: Mg2+, and total dissolved solids: TDS) had significant upward temporal variation, and 12 parameters (dissolved oxygen: DO, electric conductivity: EC, bicarbonate: HCO3−, K+, Na+, Ca2+, TDS, nitrite-nitrogen: NO2-N, nitrate nitrogen: NO3-N, TN, TP, and chlorophyll a: Chl.a) and 4 parameters (Mg2+, ammonia nitrogen: NH3-N, and the oxygen-18 and hydron-2 stable isotope: δ18O and δ2H) had a significant downward and upward spatial trend, respectively. The Gibbs plot showed that river water chemistry was mainly controlled by a water–rock interaction. The ionic relationship and principal component analysis showed that river water had undergone the dissolution of carbonate, calcite, and silicate minerals, cation exchange, a process of nitrification, photosynthesis of phytoplankton, and stable isotope enrichment. In addition, gypsum and salt rock have a potential dissolution process.

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