Journal of Hydrology最新文献

{"title":"Pore structure development during geothermal reinjection in gobs and its prediction using least absolute shrinkage and selection operator method","authors":"Yuanyuan Jiang ,&nbsp;Xincheng Hu ,&nbsp;Jiawen Cai ,&nbsp;Ganxing Zhang ,&nbsp;Guangping Huang ,&nbsp;Zhaoyang Yu ,&nbsp;Shengqiang Yang","doi":"10.1016/j.jhydrol.2025.133869","DOIUrl":"10.1016/j.jhydrol.2025.133869","url":null,"abstract":"<div><div>Geothermal reinjection in mine gobs is a potential method for geothermal exploration; however, pipeline corrosion and scaling can significantly reduce extraction efficiency. We conducted constant-temperature oscillation experiments, N₂ adsorption experiments, and X-ray photoelectron Spectrometer (XPS) experiments to clarify the pore structure development of mudstone. Subsequently, least absolute shrinkage and selection operator (LASSO) models were built to predict the pore structure development. The variations of Brunner–Emmet–Teller (BET) specific surface area, Barrett–Joyner–Halenda (BJH) pore volume, and average pore size with reaction time indicated that there were clay mineral precipitations during geothermal reinjection. Additionally, the analysis of fractal theory, pH, and X-Ray diffraction (XRD) revealed that precipitations of albite, orthoclase, illite, anorthite, kaolinite, chlorite and mineral dissolutions of dolomite were the key water–rock interaction processes during geothermal reinjection, resulting in the complex development of mudstone surface pore structure. Notably, the higher temperatures during geothermal reinjection led to more mineral precipitation, with a more complex surface structure of mudstone. Additionally, the mineral precipitation was stronger than mineral dissolution. The LASSO models showed strong predictive performance, with RMSE &lt; 0.5 and R² &gt; 0.97, demonstrating their effectiveness in forecasting pore structure evolution during geothermal reinjection.</div></div>","PeriodicalId":362,"journal":{"name":"Journal of Hydrology","volume":"662 ","pages":"Article 133869"},"PeriodicalIF":5.9,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144622541","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A unified soil freezing characteristic curve model incorporating supercooling, capillarity, adsorption, and solute effects","authors":"Yandi Wu ,&nbsp;Yijie Wang ,&nbsp;Liming Hu","doi":"10.1016/j.jhydrol.2025.133899","DOIUrl":"10.1016/j.jhydrol.2025.133899","url":null,"abstract":"<div><div>Numerous factors influence pore water freezing, such as soil–water interactions (capillarity and adsorption), pore solution salinity, and supercooling phenomena. Despite extensive research conducted on these factors, they have not yet been unified within one theoretical model. This study establishes a theoretical model to predict the soil freezing characteristic curve (SFCC), incorporating supercooling, capillarity, adsorption, and solute effects, based on a unified framework describing chemical potential equilibrium. By introducing the classical nucleation theory, the critical supercooling temperature of pore water influenced by various mechanisms can be quantified. Furthermore, the equilibrium freezing temperature controlled by soil-water interactions and salinity can also be determined from the proposed theoretical framework through the linkage with soil water characteristic curves. The proposed model was validated using a series of experimental data from various soil types, encompassing SFCCs with and without a supercooling stage, as well as under non-saline and saline conditions. The model predictions exhibit strong agreement with the experimental results. Our findings reveal that the supercooling of pore water is primarily governed by the solute concentration rather than the soil type, and the adsorbed water freezing demonstrates pronounced depression in saline soils. Salinity exerts a more pronounced effect on lowering the equilibrium freezing temperature compared to capillarity and adsorption under similar cooling conditions. By unifying diverse freezing point depression mechanisms, the proposed model not only enhances the understanding of pore water freezing phenomena but also provides a reliable tool for predicting frozen soil behaviors.</div></div>","PeriodicalId":362,"journal":{"name":"Journal of Hydrology","volume":"662 ","pages":"Article 133899"},"PeriodicalIF":5.9,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144622538","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Impact of seasonal hydrologic cycle-induced organic phosphorus processing on phosphorus dynamics in groundwater","authors":"Binyu Wang ,&nbsp;Yao Du ,&nbsp;Jiawen Xu ,&nbsp;Hao Tian ,&nbsp;Yiqun Gan ,&nbsp;Yanxin Wang","doi":"10.1016/j.jhydrol.2025.133902","DOIUrl":"10.1016/j.jhydrol.2025.133902","url":null,"abstract":"<div><div>The accumulation of geogenic phosphorus (P) in groundwater is a pressing global environmental issue. Although the degradation of P-containing dissolved organic matter (P-DOM) significantly influences geogenic P enrichment, the seasonal variations of P-DOM and their effects on geogenic P dynamics remain unclear. To address this knowledge gap, we analyzed the optical and molecular characteristics of DOM and P-DOM, coupled with hydrogeochemistry and carbon isotopes across dry, normal, and wet seasons, in a geogenic P-affected aquifer system within the central Yangtze Plain. The results showed that the concentrations of total dissolved phosphorus (TDP) and dissolved inorgnaic phosphorus (DIP) in groundwater progressively increased from the dry season to wet seasons. During the dry season, the humification degree of DOM was higher, with DIP enrichment mainly associated with the transformation of highly unsaturated compounds and polyphenols. In the normal season, enhanced leaching introduced some highly unsaturated compounds into groundwater, during which a significant negative correlation was observed between DIP concentrations and highly unsaturated compounds and polycyclic aromatics. During the wet season, the freshness of DOM markedly increased, while the percentage of P-DOM reaches its minimum. At this stage, DIP enrichment was mainly associated with highly unsaturated compounds. Rainfall-induced leaching and sediment disturbance from lake backflow introduced aromatic compounds into the groundwater. Simultaneously, the intensified interaction between surface water and groundwater allowed lake water to bring oxidizing agents into groundwater, thereby altering environment conditions conducive to P-DOM degradation and ultimately increasing groundwater P concentrations. Additionally, compounds positively correlated with DIP concentration showed increased H/C and decreased O/C ratios across seasonal variations, confirming greater P-DOM degradation during this period. This study provides a new temporal perspective on the geochemical behavior of P in groundwater, emphasizing the significant influence of seasonal variations on P cycling.</div></div>","PeriodicalId":362,"journal":{"name":"Journal of Hydrology","volume":"662 ","pages":"Article 133902"},"PeriodicalIF":5.9,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144622517","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Energy partitioning mechanism and evapotranspiration modeling of maize fields in three different climate regions in China","authors":"Yudong Zhou ,&nbsp;Haofang Yan ,&nbsp;Jianyun Zhang ,&nbsp;Guoqing Wang ,&nbsp;Chuan Zhang ,&nbsp;Hexiang Zheng ,&nbsp;Jiabin Wu ,&nbsp;Delong Tian ,&nbsp;Zhenliang Yu ,&nbsp;Biyu Wang ,&nbsp;Rongxuan Bao","doi":"10.1016/j.jhydrol.2025.133888","DOIUrl":"10.1016/j.jhydrol.2025.133888","url":null,"abstract":"<div><div>Understanding the energy partition of farmland is essential to optimize irrigation scheduling and improve crop water use efficiency. In this study, energy fluxes of maize fields in three different climate regions, Heilongjiang Province (NE-H), Inner Mongolia (NW-I), Jiangsu Province (SE-J), were measured by Bowen ratio energy balance systems (BREB) to analyze the energy partition in different growing stages. These results showed that the average ratio of latent heat flux to net radiation (<em>λET</em>/<em>R_n</em>) were 60.36%, 72.41% and 61.01%, respectively during the whole growing seasons of maize in NE-H, NW-I and SE-J, indicating that the <em>λET</em> was the main consumer of <em>R_n</em> for three regions, and the magnitude and dynamics of energy fluxes and partitioning were affected by climatic conditions. The bulk parameters: canopy conductance (<em>G_c</em>), decoupling coefficient (<em>Ω</em>) and Priestley-Taylor coefficient (<em>α</em>) were used to analyze the influence factors on <em>λET</em>. The low <em>Ω</em> values (NE-H: 0.30; NW-I: 0.31; SE-J: 0.35) indicated that strong coupling between canopy and atmosphere, and the <em>λET</em> was mainly affected by <em>G_c</em> and <em>VPD</em>. Furthermore, the average value of <em>α</em> during the maize growing season in NE-H and in SE-J were 0.78 and 0.92, respectively, indicating that the energy partition was limited by water availability in NE-H and SE-J. The path analysis results showed that <em>R_n</em> was positively correlated with <em>λET</em> in the three regions; <em>VPD</em> was negatively correlated with <em>λET</em> in NE-H and NW-I, while <em>VPD</em> was positively correlated with <em>λET</em> in SE-J. The <em>λET</em> was estimated by the parametrized Priestley-Taylor (P-T) and <em>Ω</em> models, the <em>Ω</em> model performed better in NE-H, with mean root mean square error (<em>RMSE</em>) equaled 42.94 W m⁻² (58.23 W m⁻² for the P-T model), mean absolute error (<em>MAE</em>) equaled 36.72 W m⁻² (47.73 W m⁻² for the P-T model) and the determination coefficient (<em>R</em>²) was 0.93 (0.94 for the P-T model). While the P-T model performed better than the <em>Ω</em> model in NW-I and SE-J, with <em>RMSE</em> equaled 28.82 and 30.85 W m⁻², <em>MAE</em> equaled 25.75 and 23.94 W m⁻² and <em>R</em>² equaled 0.93 and 0.92, respectively. The P-T and <em>Ω</em> models underestimated the <em>λET</em> to a certain extent in all three regions. The revealed energy partitioning mechanisms and determined <em>λET</em> could provide a theoretical basis for optimizing water resources management for the studied regions.</div></div>","PeriodicalId":362,"journal":{"name":"Journal of Hydrology","volume":"662 ","pages":"Article 133888"},"PeriodicalIF":5.9,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144622540","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Effects of hydroxylated silica surface on molecular-scale water freezing with implications for unsaturated permafrost","authors":"Shuting Ji ,&nbsp;Liang Lei ,&nbsp;Sergio Andres Galindo Torres ,&nbsp;Ling Li","doi":"10.1016/j.jhydrol.2025.133901","DOIUrl":"10.1016/j.jhydrol.2025.133901","url":null,"abstract":"<div><div>In unsaturated frozen soil, a multi-phase complex system, the influence of initial water content on the unfrozen water content remains unclear. Understanding this influence is essential for determination of the soil freezing characteristic curve (SFCC), a constitutive relation in macroscale numerical models for permafrost. This unresolved issue stems from a lack of understanding of the underlying mechanisms, including microscale processes and interfacial effects. Here, we employed molecular dynamics (MD) simulations to investigate the water freezing-thawing process based on hydroxylated silica surface, resembling an unfrozen soil system. The results revealed that the interface between water and silica forms an ordered structure via hydrogen bonding, indicating an attraction of water molecules to the silica surface. The presence of the silica surface depresses the water triple point by 5.0 K. As the water content increases, along with the pore size, the triple point decreases further by nearly 10.0 K for a 10 nm increase in pore size. Through a simple yet physically based model, we identified that a smaller distance from water to silanol groups, corresponding to systems with lower initial water content, leads to a deeper potential well, which subsequently requires more energy for phase change and higher triple point. The deeper potential well also restricts the movement of water molecules, resulting in slower dynamic processes within smaller pores. This implies that the initial water content is important in obtaining the SFCC, since the initial water content can affect the water triple point.</div></div>","PeriodicalId":362,"journal":{"name":"Journal of Hydrology","volume":"662 ","pages":"Article 133901"},"PeriodicalIF":5.9,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144622537","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characterization of the aquifer’s hydraulic properties using different pumping test modes: From oscillatory hydraulic tomography to steady state hydraulic tomography","authors":"Mohammed Aliouache ,&nbsp;Abderrahim Jardani ,&nbsp;Mohamed Krimissa ,&nbsp;Tan Minh Vu ,&nbsp;Beatriz Lourino Cabana ,&nbsp;Melanie Lorthioy","doi":"10.1016/j.jhydrol.2025.133897","DOIUrl":"10.1016/j.jhydrol.2025.133897","url":null,"abstract":"<div><div>The characterization of aquifers hydraulic properties (e.g., transmissivity and storativity) and understanding its hydrodynamics are very important for groundwater management. Hydraulic tomography (HT) is one widely used tool to achieve it. In this paper, we use the principal components geostatistical approach (PCGA) to map the transmissivity and the storativity of an aquifer by using oscillatory pumping tests, pumping tests (transient) and steady state data. Firstly, through a synthetic case study, we investigate the differences between HT results using different observation data obtained from different hydraulic tests. Moreover, we explore how sensitive are T and S estimates obtained using different observation data to changes in the hydraulic properties of a buffer area surrounding the inversion domain. Then, the synthetic case study is repeated using a real field configuration and a field application is performed. Results show that the heterogeneous area surrounding the inversion domain have a significant effect on Hydraulic Tomography results. Results also show that high frequency oscillatory pumping tests provide the best hydraulic tomography results especially for the storativity fields. Such effect becomes more pronounced when using transient and steady state observations of constant flow-rate pumping tests. Surrounding heterogeneity has a considerable effect on T field which in return affects the solution of S field as well.</div></div>","PeriodicalId":362,"journal":{"name":"Journal of Hydrology","volume":"662 ","pages":"Article 133897"},"PeriodicalIF":5.9,"publicationDate":"2025-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144622539","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Exports of organic matter, phosphorus and nitrogen from Sichuan Basin: A critical region regulating water quality of the Upper Yangtze River, China","authors":"Xiaoxiao Wang ,&nbsp;Yanhong Wu ,&nbsp;Mingliang Luo ,&nbsp;Konstantina Katsanou ,&nbsp;Jochen Wenninger ,&nbsp;Roland Bol","doi":"10.1016/j.jhydrol.2025.133889","DOIUrl":"10.1016/j.jhydrol.2025.133889","url":null,"abstract":"<div><div>The Chinese Yangtze River is a crucial nexus for nutrient cycling between the Qinghai-Tibet Plateau and the East China Sea, but it faces significant water quality challenges due to enhanced nutrient inputs from its sub-basins. The nutrient exports from the Sichuan Basin, a geographical region with intense human activities in southwest China, are foreseen to have significant impacts on the water quality of the Upper Yangtze River. To investigate the nutrient exports from the Sichuan Basin and their effects, we analysed daily data on Total Nitrogen (TN), Total Phosphorus (TP), and Chemical Oxygen Demand (COD, proxy representing organic matter) collected from 58 monitoring stations on rivers across the Sichuan Basin during 2021–2023. The results indicated that the Sichuan Basin contributed approximately 50% of the increased TN, TP, and COD in the Upper Yangtze River. The Minjiang and Qujiang Rivers rank highest in the Sichuan Basin for TN, TP exports and COD exports, respectively. Hotspots of TN and TP levels were primarily concentrated in the the western basin, while COD hotspots were mainly located in the eastern basin. The spatial analysis identified urbanization and agricultural activities as the primary drivers of nutrient distribution patterns in the Sichuan Basin. These findings underscore the need for targeted policies and strategies to enhance the controlling TN and TP losses from urban and farming areas in the rainy seasons within the catchments of the Minjiang and Tuojiang Rivers is critical for achieving sustainable water quality improvements in the Upper Yangtze River. Moving forward, the implementation of integrated pollution management strategies, supported by real-time monitoring and machine learning-based predictive modeling, is imperative in the Sichuan Basin to address the challenges of water quality deterioration driven by climate change.</div></div>","PeriodicalId":362,"journal":{"name":"Journal of Hydrology","volume":"662 ","pages":"Article 133889"},"PeriodicalIF":5.9,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144605665","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"CEASA: Dominant spatial autocorrelation in dual-constraint calibration as the game-changer for hydrological modeling with high-uncertainty remotely sensed evaporation: Application to the Meichuan basin","authors":"Yan He ,&nbsp;Xianfeng Song ,&nbsp;Tatsuya Nemoto ,&nbsp;Chen Wang ,&nbsp;Jinghao Hu ,&nbsp;Huihui Mao ,&nbsp;Runkui Li ,&nbsp;Junzhi Liu ,&nbsp;Venkatesh Raghavan ,&nbsp;Zheng Duan","doi":"10.1016/j.jhydrol.2025.133828","DOIUrl":"10.1016/j.jhydrol.2025.133828","url":null,"abstract":"<div><div>Accurate evapotranspiration (ET) estimation is vital for hydrological modeling, yet remotely sensed ET (RS-ET) products are often limited by algorithmic uncertainties and sensor biases. To mitigate error propagation and better capture spatial patterns, this study introduces the Composite Efficiency of Absolute ET and Spatial Autocorrelation (CEASA) —a dual-constraint framework that integrates absolute ET magnitude and spatial autocorrelation to enhance simulation accuracy, which marks a pivotal shift by moving beyond traditional individual-value-based calibration to incorporate spatially explicit pattern constraints.</div><div>Using four RS-ET products in China’s Meichuan Basin (three high-bias: MOD16, GLASS, SSEBop; one low-bias: PMLV2), CEASA demonstrated: (1) Dual-constraint superiority: CEASA outperformed single-constraint methods. Compared to the absolute-value-only scheme (M1), it reduced PBIAS by 18–33 % and improved KGE from 0.47 to 0.51 to 0.76–0.77 under high-bias datasets, meanwhile improving KGE to 0.84 and reducing PBIAS to 9.4 % under low-bias PMLV2. It also surpassed spatial-pattern-only approaches by 11 % in KGE under low-bias data. Notably, CEASA achieved comparable streamflow accuracy to streamflow-based calibration (M0) while improving ET simulation. (2) ​​Quality adaptivity​​: CEASA’s weighted dual-criteria architecture dynamically adapted to RS-ET quality—achieving peak performance for PMLV2 and maintaining stable accuracy for high-bias datasets by emphasizing spatial neighborhood information. (3) Spatial dominance: Entropy analysis showed spatial autocorrelation contributed &gt;70 % of the optimization signal, with higher information content than absolute ET magnitude (2.85–3.42 vs. 0.39–1.22).</div><div>CEASA redefines RS-ET application by emphasizing spatial patterns, offering a bias-resilient solution for ungauged basins. Future work should explore scale-sensitive metrics and intelligent weighting schemes for broader applicability.</div></div>","PeriodicalId":362,"journal":{"name":"Journal of Hydrology","volume":"662 ","pages":"Article 133828"},"PeriodicalIF":5.9,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144611710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Coupling dynamics of soil moisture-nitrate in deep profiles and their relations to groundwater nitrate pollution in irrigated apple production systems","authors":"Zhenxing Zhang ,&nbsp;Yubin Zhang ,&nbsp;Zhanjun Liu ,&nbsp;Yuanjun Zhu ,&nbsp;Chao Ai ,&nbsp;Xinpeng Xu ,&nbsp;Bingnian Zhai ,&nbsp;Zhaohui Wang","doi":"10.1016/j.jhydrol.2025.133892","DOIUrl":"10.1016/j.jhydrol.2025.133892","url":null,"abstract":"<div><div>Heavily fertilized and irrigated apple orchards on China’s Loess Plateau may contribute to regional groundwater nitrate pollution. To examine the groundwater pollution risk, we analysed moisture and nitrate in deep soil profiles in cropland and different aged apple orchards and nitrate in groundwater in conventionally and excessively irrigated orchards. Compared with cropland, conventionally irrigated apple orchards had higher moisture at 0–6 m but also a desiccation layer at 6.4–11 m. Regression analysis predicted desiccation would first appear at 14-yr apple orchards. Excessive irrigation did not eliminate the desiccation layer, and its thickness increased with stand age. Residual soil nitrate was significantly higher in orchards than in croplands. Soil NO₃⁻-N content stabilized at increasing depth with increasing stand age. Low NO₃⁻-N concentrations at depth and dual isotope comparisons of δ¹⁵N-NO₃⁻ and δ¹⁸O-NO₃⁻ indicated that 13 m was a sufficient depth to evaluate soil NO₃⁻-N in irrigated apple orchards. Groundwater NO₃⁻-N was much lowers in conventionally than in excessively irrigated apple orchards. According to a MixSIAR isotope mixing model, synthetic N fertilizer was the greatest contributor to groundwater NO₃⁻-N. Soil NO₃⁻-N was predicted to pollute groundwater at 38 years. Thus, fertilization and irrigation must be optimized to eliminate soil desiccation, reduce nitrate surplus, and protect groundwater.</div></div>","PeriodicalId":362,"journal":{"name":"Journal of Hydrology","volume":"662 ","pages":"Article 133892"},"PeriodicalIF":5.9,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144622547","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Tracking persistent declines in suspended sediment in the Lower Mississippi and Atchafalaya Rivers, 1992–2021: Harnessing WRTDSplus to characterize longitudinally varying trends and explore connections to streamflow","authors":"Jennifer Murphy ,&nbsp;Lindsey Schafer ,&nbsp;Scott Mize","doi":"10.1016/j.jhydrol.2025.133885","DOIUrl":"10.1016/j.jhydrol.2025.133885","url":null,"abstract":"<div><div>Suspended sediment (SS) continues a century-long decline in the Lower Mississippi and Atchafalaya Rivers, United States. In this study, we use the WRTDSplus model to estimate concentrations and loads for total, fine (&lt;0.0625 millimeter (mm)), and coarse (≥0.0625 mm) SS for 11 sites. This extension of the Weighted Regressions on Time, Discharge, and Season (WRTDS) model allows a fourth explanatory variable in the model formulation. We incorporated hysteresis terms for most models based on a residual analysis, which allowed for the identification of decreased flushing over time at some sites. Total, fine, and coarse SS concentrations and loads decreased at all sites over two trend periods (water years (WY) 1992–2021 and WY 2012–2021). Declines were largely due to changes in fine SS (mud and silt) but decreases in coarse SS (sands) were also widespread. On average, recent declines are more severe in the Lower Mississippi River below the Old River Control Complex (ORCC, −3.7 mg per liter per year (mg/L/yr)) compared to the Atchafalaya River (−2.0 mg/L/yr), although there is longitudinal variability within each river. The reach below the ORCC is a net SS sink, leading to complex temporal changes for the sites in this area. Streamflows (low, moderate, and high) have increased over these periods, with the last decade being particularly wet. Increasing streamflow and decreasing SS, with little evidence of amelioration, may influence spillway operations during floods, sediment diversion construction and operation, coastal restoration efforts, and aquatic health.</div></div>","PeriodicalId":362,"journal":{"name":"Journal of Hydrology","volume":"662 ","pages":"Article 133885"},"PeriodicalIF":5.9,"publicationDate":"2025-07-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144622545","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}