Papers by Srilert Chotpantarat
ISPRS international journal of geo-information, Jan 10, 2022
Spatial evolution can be traced by land-use change (LUC), which is a frontier issue in the field ... more Spatial evolution can be traced by land-use change (LUC), which is a frontier issue in the field of geography. Using the limited areas of Koh Chang in Thailand as the research case, this study analyzed the simulation of its spatial evolution from a multi-scenario perspective on the basis of the 1900-2020 thematic mapper/operational land imager (TM/OLI) remote sensing data obtained through the transfer matrix model, and modified LUC and the dynamic land-use change model (Dyna-CLUE). Over the past 30 years, the expansion of recreation areas and urban and built-up land has been very high (2944.44% and 486.99%, respectively) along the western coast of Koh Chang, which replaced the original mangrove forests, orchards, and communities. Logistic regression analysis of important variables affecting LUC revealed that population density variables and coastal plain topography significantly affected LUC, which showed strong β coefficients prominently in the context of a coastal tourist city. The results of the LUC and logistic regression analyses were used to predict future LUCs in the Dyna-CLUE model to simulate 2050 land-use in three scenarios: (1) natural evolution scenario, where a large patch expansion of agricultural land extends along the edge of the entire forest boundary around the island, particularly the southwestern areas of the island that should be monitored; (2) reserved area protection scenario, where the boundary of the conservation area is incorporated into the model, enabling forest preservation in conjunction with tourism development; and (3) recreation area growth scenario, where the southern area is the most susceptible to change at the new road crossing between Khlong Kloi village to Salak Phet village, and where land-use of the recreation area type is expanding. The model-projected LUC maps provide insights into possible changes under multiple pathways, which could help local communities, government agencies, and stakeholders jointly allocate resource planning in a systematic way, so that the development of various infrastructures to realize the potential impact on the environment is a sustainable coastal tourist city development.
In Thailand, pesticide use has increased exponentially over the past 15 years causing critical pu... more In Thailand, pesticide use has increased exponentially over the past 15 years causing critical public health concern. We used a geographic information system and applied a remote sensing method in an integrated manner on land use data to model the spatial patterns of pesticide exposure. We also used toxicological data to quantify the health effects in terms of disability-adjusted life years (DALYs) attributed to pesticide use in Thailand. We found that 56%of the total population (35,144,284 persons) had potential pesticide drift at their residences. Pesticide exposure was mostly due to glyphosate and paraquat applied to rice farms and atrazine applied to sugarcane farms, which were more widespread in the central and northeastern regions of the country. The total burden caused by pesticide use equated to 10,045 DALYs, of which more than half (52%) was due to use of paraquat. Regarding policy implications, all relevant sectors should work on reducing paraquat use in crop fields. Reduction of pesticide exposure should be placed as the top priority for making health-related pesticide management policies.
Water, Apr 15, 2020
Due to the continuous expansion in agriculture production and industry for many years, groundwate... more Due to the continuous expansion in agriculture production and industry for many years, groundwater usage has been increasing, with a decrease in groundwater levels in many cases. In addition, in some areas, groundwater quality has degraded due to agrochemical contamination from agricultural areas. The aims of this research pertains to aquifers as follows: (1) to evaluate hydrochemical characteristics of groundwater using multivariate statistical analysis, including principal component analysis (PCA) and hierarchical cluster analysis (HCA), and (2) to integrate the stable isotopes 18 O and 2 H with hydrochemical data to evaluate the origin of the groundwater and indirectly identify the pollution sources of groundwater contaminated with nitrate (NO 3 ). Water samples were collected from 60 groundwater wells with different hydrogeological characteristics and land use types in both the rainy season (in October) and the summer seasons (in February) in the Cha Am district of Phetchaburi Province. The groundwater was separated into 3 types: Ca-Na-Cl, Ca-Na-HCO 3 -Cl, and Na-Cl. Two groundwater wells (no. 19 and 41), which were located southeast and southwest of the study area, had relatively high NO 3 -concentrations (47 mg/L NO 3 and 50 mg/L NO 3 , respectively) that were higher than the groundwater quality standards. These two wells corresponded to the second group that was exposed by HCA. The PCA results revealed the influence of seawater intrusion. Furthermore, multivariate statistical analysis (PC 2) revealed that the NO 3 that is mainly released from potassium nitrate (KNO 3 ), for example, during pineapple cultivation, directly contaminated the groundwater system.
Scientific Reports, Jul 6, 2021
Human biomarkers were used to evaluate the lead (Pb) and arsenic (As) exposure of local people wh... more Human biomarkers were used to evaluate the lead (Pb) and arsenic (As) exposure of local people who lived in an agricultural area with intense agrochemical usage and who consumed groundwater. Although the heavy metals/metalloids in the groundwater were at low concentrations, they could cause adverse effects due to a high daily water intake rate over the long term. Biomarkers (hair, fingernails and urine) were collected from 100 subjects along with the local shallow groundwater and tap water, which is the treated deep groundwater, and investigated for the concentrations of As and Pb. Shallow groundwater had an average pH of 5.21 ± 1.90, ranging from 3.77 to 8.34, with average concentrations of As and Pb of 1.311 µg/L and 6.882 µg/L, respectively. Tap water had an average pH of 5.24 ± 1.63, ranging from 3.86 to 8.89, with the average concentrations of As and Pb of 0.77 µg/L and 0.004 µg/L, respectively. The levels of both As and Pb in the hair, fingernails and urine of shallow groundwater-consuming residents were greater than those in the hair, fingernails and urine of tap water-consuming residents. Interestingly, the As level in urine showed a linear relationship with the As concentration in groundwater (R 2 = 0.91). The average water consumption rate was approximately two-fold higher than the standard; thus, its consumption posed a health risk even at the low As and Pb levels in the groundwater. The hazard index (HI) ranged from 0.01 to 16.34 (average of 1.20 ± 2.50), which was higher than the acceptable level. Finally, the concomitant factors for As and Pb in the urine, hair and nails from both binary logistic regression and odds ratio (OR) analysis indicated that groundwater consumption was the major concomitant risk factor. This study suggested that direct consumption of this groundwater should be avoided and that the groundwater should be treated, especially before consumption. In conclusion, urine is suggested to be a biomarker of daily exposure to As and Pb, while for long-term exposure to these metals, fingernails are suggested as a better biomarker than hair. Heavy metal/metalloid contamination in freshwater supplies, especially groundwater, is a major concern worldwide . Heavy metals/metalloids have high toxicity, even at low concentrations, and can persist in groundwater for a long time. Local people in many countries still use groundwater as their major water supply and thus, could be exposed to heavy metals by consuming this water. Risk assessment can be used to predict health effects to prevent health risks from high exposure to heavy metals/metalloids. Heavy metals mostly found in environment such as arsenic (As), lead (Pb), copper (Cu), cadmium (Cd), zinc (Zn), etc. 9-11 . These heavy metals can be accumulated through blood circulation system in human body after exposure and can cause adverse
Dìqiú kēxué jíkān, 2016
Batch sorption and column transport experiments were used to investigate kaolinite colloids and C... more Batch sorption and column transport experiments were used to investigate kaolinite colloids and Cd(II) ions (Cd 2+ ) cotransport in water-saturated sand media. Batch sorption was used to evaluate Cd 2+ sorption onto kaolinite clay as a function of the initial Cd 2+ concentrations and solution ionic strengths as well as determining the equilibrium sorption isotherms. For very low ionic strength (~0 mM), the Langmuir isotherm was the more suitable isotherm for the experimental results while at higher ionic strength (> 0.45 mM) the Freundlich isotherm was the more suitable isotherm. The sorption parameters, K F , K L , n, and q m , were found to decrease with increasing ionic strength. For column transport experiments, Cd 2+ -bearing kaolinite colloids were found to be retained more in the column for an increase in the solution ionic strength. For example, the steady state breakthrough rate of Cd 2+ -bearing kaolinite colloids was 0.2 C i /C 0 for an ionic strength of 0.0 mM compared to about 0.05 C i /C 0 for ionic strengths of 0.45 and 0.9 mM. This increased Cd 2+ -bearing kaolinite colloid retention trend with increased solution ionic strength was likely due to the reduced zeta-potential and increased size of the colloid particles at higher ionic strengths. Consequently, the kaolinite-facilitated Cd 2+ concentration decreased with increasing solution ionic strength. In summary, solution ionic strength had a strong effect on the transport behavior of kaolinite-facilitated Cd 2+ and Cd 2+ -bearing kaolinite colloids through the sand column.
Water, May 30, 2020
During 29-31 September 2019, tropical storm Podul moved into the Kaeng Lawa sub-watershed (KLs), ... more During 29-31 September 2019, tropical storm Podul moved into the Kaeng Lawa sub-watershed (KLs), the upstream area of the Chi watershed, causing the worst flooding in 40 years. This study was carried out to analyze the watershed characteristic (WC) variables and prioritize the risks of land-use patterns in KLs, Khon Kaen Province, using a watershed delineation approach. As a result of this study, of the 11 sub-watersheds in the Kaeng Lawa watershed, only KL03 and KL04 were deemed medium priority within their drainage and storage capacity systems. KL01, in the upstream sub-watershed, displayed very low priority. The pattern of land-use that appeared most in KL01 sub-watershed was deforestation, where the upper forest area appeared to show a 63% decrease from 2002 to 2017. The decreased forest area was replaced with agricultural area, for crops such as sugarcane and para-rubber, and fruit farms. Moreover, increases in urban area expansion were found in the downstream area in the north of KLs. The findings of this study reveal that severe flooding in this area was caused not only by tropical storm Podul, but also by the low prioritization of watershed characteristics and patterns of land-use that resulted in decreasing forested area in this watershed area. Consequently, these factors have influenced watershed storage and caused an accumulation of water volume, which regularly results in floods. Thus, flood mitigation should be implemented urgently, in the very low priority areas of the study area first.
American Journal of Applied Sciences, Apr 1, 2011
Acid mine drainage from waste rocks, tailings and other mine components, is one of the most impor... more Acid mine drainage from waste rocks, tailings and other mine components, is one of the most important environmental concerns at mining sites. To attempt to determine the balance between the acid and neutralization potentials of the material and evaluate the possible acid-forming potential of mine waste, many static prediction tests have been developed to evaluate the acid-forming potentials of samples in recent years. Approach: This study attempts to highlight and summarize their essential issues and collates the mining projects that have used such static tests. Results: The advantages and disadvantages of each technique are compared to formulate and present guidelines for the appropriate selection and application of these tests. According to many studies, although several test methods have been modified in recent years, the ABA, NAG and paste pH methods are the most commonly static tests reported for initially indicating the acid-generating and neutralizing potential of samples. Conclusion/Recommendations: To provide confident acidforming predictions and consequently, the best waste management plans, at least several different techniques needs to be applied together in order to classify the acid generating potential of a sample more reliably.
Hydrological model of landslide risk in Huai Nam Phung subbasin, Thailand
Bulletin of Engineering Geology and the Environment
Determination of conditioning factors for mapping nickel contamination susceptibility in groundwater in Kanchanaburi Province, Thailand, using random forest and maximum entropy
Environmental Geochemistry and Health
The risk assessment of arsenic contamination in the urbanized coastal aquifer of Rayong groundwater basin, Thailand using the machine learning approach
Ecotoxicology and Environmental Safety
Biodiversitas Journal of Biological Diversity
Acanthamoeba is widely distributed in water, soil, dust and air. Beaches are popular tourist dest... more Acanthamoeba is widely distributed in water, soil, dust and air. Beaches are popular tourist destinations for water-related activities while they can also be reservoirs for Acanthamoeba to humans. This study aimed to determine the genotyping of Acanthamoeba in the beach environment and characterized their pathogenicity potential. A total of 63 samples were collected from six beaches in Phuket Province, Thailand. Twenty-one samples of each source including wet sand, dry sand and seawater, were collected and cultivated on 2% non-nutrient agar coated with heat-killed Escherichia coli. Acanthamoeba was found in 100% (n=21) wet sand, 52.4% (n=11) dry sand and 14.3% (n=3) seawater. Sequence analysis of the GTSA.B1 region in 18S rRNA revealed that 83.9% of sequenced isolates belonged to the T5 genotype and 16.1% belonged to the T4 genotype. The T5 genotype was predominant, differing from other reports of Acanthamoeba prevalence in natural sources. In vitro thermal and salt-tolerance showed that all isolates had growth rates similar to clinical Acanthamoeba isolates. This research was undertaken to increase awareness of human eye and brain infections caused by Acanthamoeba on beaches. Further studies on these Acanthamoeba isolates are still required such as co-culture assay between the trophozoites and human cell lines to confirm their pathogenicity as well as their susceptibility to the chemotherapeutic agents.
Mapping groundwater potential zones in Kanchanaburi Province, Thailand by integrating of analytic hierarchy process, frequency ratio, and random forest
Ecological Indicators
Global review of groundwater potential models in the last decade: Parameters, model techniques, and validation
Journal of Hydrology
Energies
Ground source heat pump (GSHP) systems have been used worldwide in buildings because of their adv... more Ground source heat pump (GSHP) systems have been used worldwide in buildings because of their advantages of highly efficient performance in terms of energy and environment for space cooling and heating; however, cooling demand is predominant in tropical climates. This paper reviews of the GSHP systems applications in Southeast Asia; several applications of GSHP in Thailand, Indonesia, Malaysia, Singapore, and Vietnam have been addressed. Experiments were initiated in 2006 in Kamphaengphet; the latest experiment found in the Scopus searching tool is the GSHP simulation in Kuantan in 2019 using EnergyPlus using the ground loop design software. GSHP systems have the potential to be used in Southeast Asia despite the dominance of cooling demand, leading to a thermal imbalance within the subsurface. This imbalance can reduce the performance of the system; however, groundwater flow is considered as a key factor in preventing the effect of thermal distribution owing to GSHP operation. Thes...
Frontiers in Earth Science
Groundwater has been widely used in Thailand for many purposes, including agricultural activities... more Groundwater has been widely used in Thailand for many purposes, including agricultural activities; therefore, groundwater can be contaminated and affect the environment and human health. One of the most commonly applied and imported pesticides is atrazine, which is an herbicide used to control annual broadleaf and grass weeds in sugarcane. Monitoring and reducing the atrazine leaching potential into groundwater would play an important role in preventing this problem. The aim of this study is to evaluate the leaching potential of atrazine in Song Phi Nong District, Suphan Buri Province, via the attenuation/retardation factor model (AF/RF model) and the groundwater ubiquity score (GUS). It was found that most of the agricultural areas, especially the sugarcane fields, had high leaching potential due to the low adsorption and water holding capacity of the soil. The performance of the model was then evaluated by the result of nitrate (NO3−) detection in groundwater, which has been repor...
Assessment of groundwater dynamics in Quaternary aquifers of the Phrae Basin, northern Thailand, using isotope techniques
Hydrogeology Journal
The Quaternary sequences in the Phrae Basin, northern Thailand, can be classified into three aqui... more The Quaternary sequences in the Phrae Basin, northern Thailand, can be classified into three aquifers based on depth. The groundwater dynamics and recharge of these aquifers were assessed using isotope techniques, and flow directions were acquired using groundwater level of selected wells. Groundwater flows from northwest and west to the centre of the basin on the western side of the Yom River, while flow is from northeast and east to centre on the eastern side. The groundwater mean residence time (MRT) within the shallow aquifer is 1–30 years using 3H time series, estimated by the exponential piston-flow model (EPM), which is one option of the selected lumped-parameter model (TracerLPM). Groundwater in the shallow aquifer mainly originated from local rainfall and surface water. Recharge rates were estimated using MRT and chloride mass balance, with results of 305 mm year−1 and 301–309 mm year−1, respectively. The groundwater age range (1,087–22,920 years BP) was determined by 14C dating and corrected using 14C-DIC models. The horizontal velocities of the deep aquifer were between 3 and 5 m year−1, and vertical velocity was ~0.0235 m year−1 based on 14C ages and depth. Groundwater in the intermediate and deep aquifers was recharged mainly from local rainfall at 220–300 m above mean sea level. Interactions between groundwater and river water were detected close to the Yom River when it was in full flow. These findings on groundwater dynamics and quantity could aid water resource management within the Phrae Basin.
The relationship between geochemical parameters and the communities of arsenite-oxidizing bacteria in Rayong groundwater basin
As is one of toxic metalloid commonly found on the earth's surface. In groundwater, arsenite ... more As is one of toxic metalloid commonly found on the earth's surface. In groundwater, arsenite (As3+) and arsenate (As5+) are most predominant As species. Arsenite is more toxic than arsenate. As removal through bioremediation technique can be applied as an alternative method. This study aimed to investigate the community of arsenite-oxidizing bacteria in As-contaminated groundwater and to correlated them to the geochemical parameters. Nineteen groundwater samples were collected from Ban-khai and Muang districts, Rayong province, Thailand. The communities of arsenite-oxidizing bacteria were detected by using PCR-cloning-sequencing techniques, targeting aioA gene. The results showed that the detected arsenite-oxidizing bacteria were associated with α-, β-, and γ-Protebacteria. The γ-Protebacterial cluster was detected in groundwater with low to moderate As concentrations, while it was undetected in groundwater with high As concentration. PHREEQC geochemical model was used to identi...
Water balance and safe yield in the quaternary aquifer of phrae basin
Phrae province has experienced a drought problem, especially in dry season. The aims of this rese... more Phrae province has experienced a drought problem, especially in dry season. The aims of this research were to evaluate the spatio-temporal distribution of groundwater recharge into the Quaternary unconsolidated sedimentary aquifers as well as to assess groundwater balance and suitable safe yield of the aquifers. The research was divided into two main parts as follows: in the first part, surface water modeling, namely, SWAT. The results showed that runoff after land use changes from 2003 to 2009 appeared to be significantly increased in all sub-watersheds in a range from 4.94% (station Y.38) to 77.64% (station Y.24). The groundwater recharge of each sub-watershed was in a range from 14.62 mm/yr to 433.86 mm/yr. Interestingly, not only the impact of land use causes the increase of runoff hydrograph, but it also results in gradually decreasing in the percentage of groundwater recharge (as compared to total annual rainfall) of each sub-watershed, ranging from 0.26% (station Y.6) to 5.12...
Determination of rainfall data for direct runoff prediction in monsoon region: a case study in the Upper Yom basin, Thailand
Natural Hazards, 2022
In a monsoon region, flooding is usually caused by heavy rainfall events in conjunction with satu... more In a monsoon region, flooding is usually caused by heavy rainfall events in conjunction with saturated soil. A hydrograph in the wet season consists of multiple flood waves from periods of direct runoff lying on a wave of seasonal baseflow from groundwater. This study determined which rainfall duration and occurrence time were most correlated with direct runoff in the Upper Yom basin, Thailand. First, correlation coefficients (CCs) between basin discharge and rainfall under various durations throughout wet seasons during 2009–2018 were calculated. The discharges were correlated with 48 h rainfall ending 12 h before. However, the CCs were not very good (0.35–0.60, except in 2011). Therefore, the CCs only during saturated soil periods were calculated and this produced better results (0.50–0.79). Next, the baseflow was removed from the basin discharge to determine the direct runoff. The CCs between direct runoff and rainfall were even better (0.59–0.83). Therefore, after the removal of the unsaturated soil period and the baseflow, the direct runoff could be predicted from the 48 h rainfall that began 60 h before and ended 12 h before. This duration was associated with basin characteristics and overall spatial distribution pattern of rainfall.
ISPRS International Journal of Geo-Information, 2022
Spatial evolution can be traced by land-use change (LUC), which is a frontier issue in the field ... more Spatial evolution can be traced by land-use change (LUC), which is a frontier issue in the field of geography. Using the limited areas of Koh Chang in Thailand as the research case, this study analyzed the simulation of its spatial evolution from a multi-scenario perspective on the basis of the 1900–2020 thematic mapper/operational land imager (TM/OLI) remote sensing data obtained through the transfer matrix model, and modified LUC and the dynamic land-use change model (Dyna-CLUE). Over the past 30 years, the expansion of recreation areas and urban and built-up land has been very high (2944.44% and 486.99%, respectively) along the western coast of Koh Chang, which replaced the original mangrove forests, orchards, and communities. Logistic regression analysis of important variables affecting LUC revealed that population density variables and coastal plain topography significantly affected LUC, which showed strong β coefficients prominently in the context of a coastal tourist city. Th...
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Papers by Srilert Chotpantarat