Innovative polygon trend analysis for salinity trend detection in Ho Chi Minh City, Vietnam

IF 2.8 4区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES Environmental Earth Sciences Pub Date : 2025-01-30 DOI:10.1007/s12665-025-12096-5

Phan Thi Ha, Pham Quoc Khanh, Le Hoang Tu, Nguyen Thi Huyen, Vo Ngoc Quynh Tram, Nguyen Duy Liem, Nguyen Kim Loi

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Abstract

Detecting past characteristic of hydro-climatic variables can provide a deeper understanding of the effects of climate change on water resources. Among the hydro-meteorological parameters, salinity is one of the most critical factors. This study explored the average monthly salinity trends of the six stations in Ho Chi Minh City for the period from 2007 to 2021, using the Innovative Polygon Trend Analysis (IPTA). IPTA is a simple approach that allows for fine-trend interpretation and avoids the fundamental assumptions in classical methods, such as normality, independence, and pre-whitening. Polygon graphics for monthly salinity data were analyzed using arithmetic mean and standard deviation to assess trend length and slope. The outcomes showed that most of the statistically significant transitions (April–May, November–December) occurred in consecutive months between dry and rainy seasons, with the highest average trend length values of 9.88 g/l and 8.31 g/l at Ong Thin and Nha Be stations, respectively. Particularly, the maximum length trend in the dry season also highlighted a characteristic of the salinity transition over time. Therefore, the application of IPTA provides insights into many months’ cycles, which are essential for the salinization management of the study area.

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越南胡志明市盐度趋势检测的创新多边形趋势分析

探测水文气候变量的过去特征可以更深入地了解气候变化对水资源的影响。在水文气象参数中，盐度是最关键的因素之一。本研究利用创新多边形趋势分析（IPTA）对2007 - 2021年胡志明市6个站点的月平均盐度趋势进行了研究。IPTA是一种简单的方法，允许精细趋势解释，避免了经典方法中的基本假设，如正态性、独立性和预白化。利用算术平均值和标准偏差对每月盐度数据的多边形图形进行分析，以评估趋势长度和斜率。结果表明：4 ~ 5月、11 ~ 12月的显著变化主要发生在旱季和雨季之间的连续月份，其中翁淡站和芽别站的平均趋势长度最高，分别为9.88 g/l和8.31 g/l；特别是，旱季的最大长度趋势也突出了盐度随时间变化的特征。因此，IPTA的应用提供了许多月周期的见解，这对研究地区的盐渍化管理至关重要。

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来源期刊

Environmental Earth Sciences 环境科学-地球科学综合

CiteScore

5.10

自引率

3.60%

发文量

494

审稿时长

8.3 months

期刊介绍： Environmental Earth Sciences is an international multidisciplinary journal concerned with all aspects of interaction between humans, natural resources, ecosystems, special climates or unique geographic zones, and the earth: Water and soil contamination caused by waste management and disposal practices Environmental problems associated with transportation by land, air, or water Geological processes that may impact biosystems or humans Man-made or naturally occurring geological or hydrological hazards Environmental problems associated with the recovery of materials from the earth Environmental problems caused by extraction of minerals, coal, and ores, as well as oil and gas, water and alternative energy sources Environmental impacts of exploration and recultivation – Environmental impacts of hazardous materials Management of environmental data and information in data banks and information systems Dissemination of knowledge on techniques, methods, approaches and experiences to improve and remediate the environment In pursuit of these topics, the geoscientific disciplines are invited to contribute their knowledge and experience. Major disciplines include: hydrogeology, hydrochemistry, geochemistry, geophysics, engineering geology, remediation science, natural resources management, environmental climatology and biota, environmental geography, soil science and geomicrobiology.