Physics and Chemistry of the Earth最新文献_第2页

Refining historical forest cover mapping and change analysis with time series algorithm-based samples transfer

IF 3 3区地球科学

Physics and Chemistry of the Earth Pub Date : 2025-02-23 DOI: 10.1016/j.pce.2025.103893

Qianhuizi Guo , Ling Han , Liangzhi Li , Songjie Qu

{"title":"Refining historical forest cover mapping and change analysis with time series algorithm-based samples transfer","authors":"Qianhuizi Guo , Ling Han , Liangzhi Li , Songjie Qu","doi":"10.1016/j.pce.2025.103893","DOIUrl":"10.1016/j.pce.2025.103893","url":null,"abstract":"<div><div>Accurate forest cover maps are crucial for ecosystem monitoring and sustainable land use planning. Traditionally, supervised learning methods usually rely on high-quality ground-truth data, which makes it difficult to apply when historical data collection is costly. This study investigates the effectiveness of the LandTrendr algorithm in long-term sample transfer management. First, we assessed the performance of four commonly used machine learning models (random forest, artificial neural network, support vector machine, and XGBoost) in classifying land cover in the reference year. Then, by integrating the best model's classification results with the LandTrendr algorithm, we simplified the process of manually selecting sample points by identifying stable pixel samples, and generated a long-term dataset consistent across time scales, facilitating land cover mapping for historical periods and providing benchmark data for forest cover change analysis. The results show that, among the four models, XGBoost achieved the highest classification accuracy (overall accuracy OA = 0.87, Kappa coefficient = 0.85). By comparing the sample transfer strategy to the traditional model transfer method, we found that the LandTrendr based sample transfer method consistently achieved over 85% accuracy in forest classification throughout the study period, outperforming the direct model transfer approach. Although accuracy decreased over time, the sample transfer method demonstrated stronger consistency. Overall, this study simplifies the process of continuous field data collection by utilizing LandTrendr to transfer stable pixel samples across multiple years, providing methodological support for the dynamic analysis of forest cover changes in Shaanxi Province over time.</div></div>","PeriodicalId":54616,"journal":{"name":"Physics and Chemistry of the Earth","volume":"139 ","pages":"Article 103893"},"PeriodicalIF":3.0,"publicationDate":"2025-02-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143552638","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Wildfire-derived deforestation, climate, and biodiversity variables analysis in Cambodia

IF 3 3区地球科学

Physics and Chemistry of the Earth Pub Date : 2025-02-21 DOI: 10.1016/j.pce.2025.103894

Bijay Halder , Biswarup Rana , Liew Juneng , Fahad Alshehri , Kaywan Othman Ahmed , Malay Pramanik , Minhaz Farid Ahmed , Chaitanya Baliram Pande , Shafik S. Shafik , Zaher Mundher Yaseen

{"title":"Wildfire-derived deforestation, climate, and biodiversity variables analysis in Cambodia","authors":"Bijay Halder , Biswarup Rana , Liew Juneng , Fahad Alshehri , Kaywan Othman Ahmed , Malay Pramanik , Minhaz Farid Ahmed , Chaitanya Baliram Pande , Shafik S. Shafik , Zaher Mundher Yaseen","doi":"10.1016/j.pce.2025.103894","DOIUrl":"10.1016/j.pce.2025.103894","url":null,"abstract":"<div><div>In Southeast Asia, Cambodia has the highest rate of wildfire, and during the early 2000s, fire activity has dramatically grown. Since wildfires are frequently multidimensional, it is still challenging to assess the relative significance of each component. Assessment of the environmental condition is highly dependent on forest fire, climate, biological, and biophysical aspects investigation using Google Earth Engine (GEE) and MODIS data. This study created a framework for identifying concerns connected to forest fires in Cambodia between 2005 and 2023. There were 975.90 km<sup>2</sup> of observed afforestation and 35561.33 km<sup>2</sup> of deforested area due to the forest fire. The annual average rainfall observed between 2005 and 2023 shows 9.76 mm decreased while evapotranspiration increased by 24.85 mm. While Cambodia's surface temperature decreased by 2.72 °C, latent heat (LE) increased from 0.14 W/m<sup>2</sup> (2005) to 0.22 W/m<sup>2</sup> (2023). Surface temperature and precipitation have negative correlation values of −0.48 (2005), −0.55 (2010), −0.54 (2015), −0.52 (2020), and −0.38 (2023). Forest fires have had a major impact on Cambodia's ecosystem and climate. This study enhances the present comprehension of the causes of forest fires in Cambodia, and the methodological framework created has great potential for application to other regions of the world that are prone to forest fires.</div></div>","PeriodicalId":54616,"journal":{"name":"Physics and Chemistry of the Earth","volume":"139 ","pages":"Article 103894"},"PeriodicalIF":3.0,"publicationDate":"2025-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143480290","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Rheology and electrical conductivity of upper mantle: Recent progress and perspectives

IF 3 3区地球科学

Physics and Chemistry of the Earth Pub Date : 2025-02-20 DOI: 10.1016/j.pce.2025.103891

Man Li , Shi Li

引用次数: 0

Multi-temporal remote sensing and geospatial analysis for urban ecosystem service dynamics: A three-decade assessment of land surface transformation in Jeddah, Saudi Arabia

IF 3 3区地球科学

Physics and Chemistry of the Earth Pub Date : 2025-02-18 DOI: 10.1016/j.pce.2025.103892

Hamad Ahmed Altuwaijri , Abdulla Al Kafy , Zullyadini A. Rahaman

{"title":"Multi-temporal remote sensing and geospatial analysis for urban ecosystem service dynamics: A three-decade assessment of land surface transformation in Jeddah, Saudi Arabia","authors":"Hamad Ahmed Altuwaijri , Abdulla Al Kafy , Zullyadini A. Rahaman","doi":"10.1016/j.pce.2025.103892","DOIUrl":"10.1016/j.pce.2025.103892","url":null,"abstract":"<div><div>The rapid transformation of Earth's surface through urbanization presents critical challenges for ecosystem sustainability and climate resilience. This study employs advanced remote sensing and geospatial technologies to monitor and assess the spatiotemporal dynamics of urban ecosystem services in Jeddah, Saudi Arabia, over three decades (1993–2023). Using multi-temporal Landsat imagery analyzed through Support Vector Machine algorithms in <span>Google</span> Earth Engine, we achieved high-accuracy (>85%) land use/land cover classification to quantify urban expansion patterns and their impact on ecosystem service values (ESVs). The analysis revealed significant urban intensification, with built-up areas expanding by 145.70 km<sup>2</sup>, resulting in the conversion of 130.74 km<sup>2</sup> of barren soil, 7.14 km<sup>2</sup> of vegetation, and 7.71 km<sup>2</sup> of water bodies. This transformation led to a substantial reduction in ESVs totaling $477.48 million, with the most significant impacts on hydrological regulation (-$114.25 million), waste treatment (-$97.05 million), and biodiversity protection (-$72.78 million) services. The spatiotemporal analysis demonstrated clear patterns of ecosystem service degradation, particularly in the city's central regions. Our findings provide crucial insights for achieving UN Sustainable Development Goals (Target 11.1, 6.6., 13.1, 3.9 and 15.1) by quantifying the environmental costs of rapid urbanization and informing evidence-based urban planning strategies. The study's innovative integration of remote sensing, machine learning, and ecosystem service valuation offers a robust framework for monitoring urban ecosystem dynamics and supporting sustainable urban development in rapidly growing arid regions.</div></div>","PeriodicalId":54616,"journal":{"name":"Physics and Chemistry of the Earth","volume":"139 ","pages":"Article 103892"},"PeriodicalIF":3.0,"publicationDate":"2025-02-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143480291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Virtual arable land trade reveals inequalities in the North China Plain: Regional heterogeneity and influential determinants

IF 3 3区地球科学

Physics and Chemistry of the Earth Pub Date : 2025-02-17 DOI: 10.1016/j.pce.2025.103889

Chuyao Weng , Yuping Bai , Yecui Hu , Wanen Cai , Shibin Zhang , Jiayao Shu

{"title":"Virtual arable land trade reveals inequalities in the North China Plain: Regional heterogeneity and influential determinants","authors":"Chuyao Weng , Yuping Bai , Yecui Hu , Wanen Cai , Shibin Zhang , Jiayao Shu","doi":"10.1016/j.pce.2025.103889","DOIUrl":"10.1016/j.pce.2025.103889","url":null,"abstract":"<div><div>Arable land supply in North China Plain (NCP) has significantly contributed to national food security and economic development in China. To clarify the complex arable land use relationships between NCP and other provinces in China, this study applied an environmentally extended multi-regional input-output model to analyze the spatio-temporal variation characteristics of virtual arable land (VAL) trade in China associated with the food supply in NCP from 2007 to 2017. The driving forces of VAL trade were further identified using structural decomposition analysis (SDA). The results showed that NCP exported 10.280 Mha of VAL to other provinces in China in 2017, with a decrease of 2.85% compared to 2007. At the same time, NCP imported 13.799 Mha of VAL from other provinces, with an increase of 4.39%. The top net importers from NCP were Zhejiang (1.355 Mha), Shanxi (0.862 Mha) and Guangdong (0.746 Mha), which are mostly located on the developed southern coast. The top three provinces of NCP that supplied the largest proportions of VAL to the outside were Henan (30.89%), Anhui (26.32%) and Hebei (22.93%). Meanwhile, the gap between per capita consumption-based arable land of provinces in NCP is decreasing. The findings of SDA revealed that resource intensity caused a reduction of 23.09 Mha of VAL, while per capita consumption caused an increase of 27.39 Mha of VAL from 2007 to 2017. This study helps support optimization of the interregional supply mode, promotion of resource complementarity and industrial cooperation among different regions, and achievement of sustainable agricultural development.</div></div>","PeriodicalId":54616,"journal":{"name":"Physics and Chemistry of the Earth","volume":"138 ","pages":"Article 103889"},"PeriodicalIF":3.0,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143438236","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A sustainable and cost-effective approach for efficient removal of Direct Blue-14 azo dye from wastewater using North American Zeolite for developing countries

IF 3 3区地球科学

Physics and Chemistry of the Earth Pub Date : 2025-02-12 DOI: 10.1016/j.pce.2025.103888

Eman A. Al-Abbad , Rabia Rehman , Muhammad Sadiq Hussain

引用次数: 0

Climate change impact assessment on the river discharge of the upper Ganga Subbasin

IF 3 3区地球科学

Physics and Chemistry of the Earth Pub Date : 2025-02-11 DOI: 10.1016/j.pce.2025.103887

Rajeev Ranjan , Ajanta Goswami , C.S.P. Ojha , Sanjay Jain , Praveen Kumar Singh

{"title":"Climate change impact assessment on the river discharge of the upper Ganga Subbasin","authors":"Rajeev Ranjan , Ajanta Goswami , C.S.P. Ojha , Sanjay Jain , Praveen Kumar Singh","doi":"10.1016/j.pce.2025.103887","DOIUrl":"10.1016/j.pce.2025.103887","url":null,"abstract":"<div><div>The HKH region has many glaciers, providing fresh water to a large population downstream. The hydrological system is susceptible to climate change, especially temperature and precipitation. The present study aims to investigate the impact of climate change on the discharge and water balance of the snow-dominated upper Ganga Basin. The study utilized CMIP6 scenarios SSP2-4.5 and SSP5-8.5 with SPHY to simulate future hydrological changes in the basin. We calibrated and validated the model for simulation by using observed discharge data at Devprayag. The historical period (1985–2014) calibrated at Devprayag showed rainfall, snow, glacier, baseflow, and total discharge of 509.5 m3/s, 117.5 m<sup>3</sup>/s, 86.1 m<sup>3</sup>/s, 78.9 m<sup>3</sup>/s, and 792.0 m<sup>3</sup>/s, respectively. Contribution to total flow was 63.3% (rain), 10.8% (glaciermelt), 14.9% (snowmelt), and 10.0% (baseflow). Total runoff increased, with rainfall runoff, contributing the most, followed by glaciermelt runoff and baseflow, while snowmelt decreased. By the end of 21st century, temperature and precipitation is anticipated to rise under SSP5-8.5. The model estimates substantially impacted the basin hydrology and water balance, with a 50% increase in total flow in the Far Future (2076–2100). The snowmelt contribution is estimated to decrease by 57% by 2090, but the water supply is not expected to desrease. The analysis showed that snowmelt runoff will be reduced through time, and river discharge will be highly impacted by climate change. This work will improve understanding of water availability, snowmelt, and glacier melt dynamics, which, along with climate change, lead to sustainable water resource management.</div></div>","PeriodicalId":54616,"journal":{"name":"Physics and Chemistry of the Earth","volume":"138 ","pages":"Article 103887"},"PeriodicalIF":3.0,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143427851","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

An integrated comprehensive approach describing structural features and comparative petrophysical analysis between conventional and machine learning tools to characterize carbonate reservoir: A case study from Upper Indus Basin, Pakistan

IF 3 3区地球科学

Physics and Chemistry of the Earth Pub Date : 2025-02-08 DOI: 10.1016/j.pce.2025.103885

Zohaib Naseer , Urooj Shakir , Muyyassar Hussain , Qazi Adnan Ahmad , Kamal Abdelrahman , Muhammad Fahad Mahmood , Mohammed S. Fnais , Muhsan Ehsan

{"title":"An integrated comprehensive approach describing structural features and comparative petrophysical analysis between conventional and machine learning tools to characterize carbonate reservoir: A case study from Upper Indus Basin, Pakistan","authors":"Zohaib Naseer , Urooj Shakir , Muyyassar Hussain , Qazi Adnan Ahmad , Kamal Abdelrahman , Muhammad Fahad Mahmood , Mohammed S. Fnais , Muhsan Ehsan","doi":"10.1016/j.pce.2025.103885","DOIUrl":"10.1016/j.pce.2025.103885","url":null,"abstract":"<div><div>More than 70% of the global hydrocarbon reserves are present in carbonated rocks. Evaluating prospects in carbonate reservoirs is a complicated task because of their unique depositional features. The Eocene carbonates in the Joyamair oil field are heterogeneous and present challenges defining the entrapment and sealing mechanism by applying traditional methods. Although structural interpretation revealed a positive triangular geometry, estimating accurate reservoir properties requires an effective model for assessing hydrocarbon presence. Therefore, an optimized machine learning (ML) approach has been deployed to address reservoir challenges and delineate the potential with a high success rate after drawing a comparison with the conventional approach. Two wells were utilized for petrophysical evaluation in the conventional method, while one well (Joyamair-04) was kept blind in a supervised ML approach. Extra Tree Regressor (ETR) produced a low volume of shale and effective porosity (PHIE) high results with more than 99% R<sup>2</sup> and least mean square error score. Random Forest Regressor (RFR) showed water saturation (S<sub>w</sub>) results with about 100% accuracy compared to conventional interpretation at a blind well. Volumetric reserve estimation also proved economical hydrocarbon reserves present in the reservoir formation. The study revealed that integrating conventional and ML techniques along with structural geometry aided better reservoir characterization and reserve estimation. The study proved that ML algorithms outperformed traditional petrophysical methods in accuracy and efficiency.</div></div>","PeriodicalId":54616,"journal":{"name":"Physics and Chemistry of the Earth","volume":"138 ","pages":"Article 103885"},"PeriodicalIF":3.0,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143378283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Strong mining pressure characteristics and stability control in large height coal face under continuous extraction: A case study

IF 3 3区地球科学

Physics and Chemistry of the Earth Pub Date : 2025-02-06 DOI: 10.1016/j.pce.2025.103886

Xu Liang , Zhen Zhang , Qianjin Liu , Zhen Li

{"title":"Strong mining pressure characteristics and stability control in large height coal face under continuous extraction: A case study","authors":"Xu Liang , Zhen Zhang , Qianjin Liu , Zhen Li","doi":"10.1016/j.pce.2025.103886","DOIUrl":"10.1016/j.pce.2025.103886","url":null,"abstract":"<div><div>In underground coal mining, the strong dynamic pressure resulting from continuous extraction frequently leads to instability accidents. A case study was conducted at Xiaobaodang No. 1 Coal Mine to address the issues, utilizing numerical simulation, microseismic (MS) monitoring, and site observation methods. The findings indicate that significant mining pressure is observed when the damage zone above the tailgate of the current working face extends through the overlying strata of the pillar towards the neighboring gob during the second mining phase. The damage zones within the overlying rock layers of the two working faces ultimately converge, resulting in significant mining pressure at the site. The safety valve opening rate is generally above 80%, indicating significant mining pressure intensity, particularly in the tailgate. MS events and active roof movement are concentrated in the tailgate and neighboring gob during the second mining phase. The plastic zone radius at No. 112204 tailgate expands from 3 m to 7 m, with MS events primarily occurring 80 m behind to 40 m ahead of the working face, necessitating the need for reinforcement support. Following the implementation of various measures, such as coordinated support using anchors and anchor rods, continuous slotting and floor breaking, along with multi-zone grouting, the integrity of the surrounding rocks is ultimately preserved. Controlling concepts considering geological and mining factors are finally discussed and recommended. The study serves as a significant reference for the prevention and control of intense mining pressure during ongoing extraction processes.</div></div>","PeriodicalId":54616,"journal":{"name":"Physics and Chemistry of the Earth","volume":"138 ","pages":"Article 103886"},"PeriodicalIF":3.0,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143378275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Snow avalanche in the Indian Himalayas: Hazard zonation and climate change trends in Kullu region of Himachal Pradesh, India

IF 3 3区地球科学

Physics and Chemistry of the Earth Pub Date : 2025-02-06 DOI: 10.1016/j.pce.2025.103882

Joshal K. Bansal , Ajanta Goswami , Snehmani , Arijit Roy

{"title":"Snow avalanche in the Indian Himalayas: Hazard zonation and climate change trends in Kullu region of Himachal Pradesh, India","authors":"Joshal K. Bansal , Ajanta Goswami , Snehmani , Arijit Roy","doi":"10.1016/j.pce.2025.103882","DOIUrl":"10.1016/j.pce.2025.103882","url":null,"abstract":"<div><div>This research provides an in-depth analysis of snow avalanche behavior in the Indian Himalayas, specifically targeting the Kullu region. The study integrates climate data, terrain characteristics and field validations to apply Object-Based Image Segmentation (OBIS) analysis for more precise hazard zonation. Over the past few decades, the region has experienced a notable increase in avalanche frequency and intensity, correlating these changes with climatic factors such as rising temperatures, altered precipitation patterns, and anthropogenic influences like infrastructure development. The study emphasizes the complex interplay between meteorological variables—including snow temperature, wind speed etc. and the topographical features contributing to avalanche susceptibility. OBIS, supported by field surveys and literature, allows for a refined identification of high-risk avalanche zones, significantly enhancing prediction models. The findings also reveal that climate change trends are expected to amplify the frequency and magnitude of avalanche occurrences in the future, posing heightened risks to local populations, infrastructure and the region's biodiversity. The study contributes critical insights for developing robust risk management and climate adaptation strategies by systematically identifying avalanche-prone areas and analysing climate change projections. These strategies are essential for safeguarding vulnerable mountain communities and ecosystems. The broader implications of this research extend beyond the Indian Himalayas, contributing to the global understanding of avalanche dynamics and highlighting the need for comprehensive climate adaptation and disaster risk reduction frameworks in high-altitude regions.</div></div>","PeriodicalId":54616,"journal":{"name":"Physics and Chemistry of the Earth","volume":"138 ","pages":"Article 103882"},"PeriodicalIF":3.0,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143378276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0