A5067616792- Hydrology and Watershed Management Studies
- Soil and Water Nutrient Dynamics
- Hydrological Forecasting Using AI
- Urban Stormwater Management Solutions
- Soil erosion and sediment transport
- Cryospheric studies and observations
- Flood Risk Assessment and Management
- Groundwater flow and contamination studies
- Groundwater and Isotope Geochemistry
- Soil Moisture and Remote Sensing
- Fish Ecology and Management Studies
- Hydrology and Sediment Transport Processes
- Smart Materials for Construction
- Wastewater Treatment and Nitrogen Removal
- Water Quality Monitoring and Analysis
- Hydrology and Drought Analysis
- Water Quality Monitoring Technologies
- Marine and coastal ecosystems
- Water resources management and optimization
- Species Distribution and Climate Change
- Regional Development and Environment
- Water-Energy-Food Nexus Studies
- Soil and Unsaturated Flow
- Ionosphere and magnetosphere dynamics
- Fire effects on ecosystems
Pacific Northwest National Laboratory
2020-2025
Vanderbilt University
2022
Lehigh University
2020
Hunter College
2018-2019
Research Foundation of The City University of New York
2016-2019
City University of New York
2018-2019
University of California, Santa Barbara
2018
University of California System
2012
The University of Western Australia
2007
The use of uncertainty analysis is gaining considerable attention in catchment hydrological modeling. In particular, the choice appropriate model structure, identifiability parameter values, and reduction predictive are deemed as essential elements chosen structure must be parsimonious, parameters used either derivable from field‐measured data or inferred unambiguously response data. this paper, a long‐term water balance for Susannah Brook Western Australia has been pursued using “downward...
Winter is an understudied but key period for the socioecological systems of northeastern North American forests. A growing awareness importance winter season to forest ecosystems and surrounding communities has inspired several decades research, both across northern at other mid- high-latitude around globe. Despite these efforts, we lack a synthetic understanding how climate change may impact hydrological biogeochemical processes social economic activities they support. Here, take advantage...
Abstract Global sensitivity analysis (GSA) often is applied to assess the of model outputs their inputs using ensemble simulations. However, increasing complexity and associated computational cost have limited use most GSA approaches for process‐based watershed models. We propose mutual information (MI) as a computationally efficient method modeling. Such MI computed from several hundred realizations usually can capture nonlinear relationships between interest. perform MI‐based analyses in...
Abstract Hyporheic zones regulate biogeochemical processes in streams and rivers, but high spatiotemporal heterogeneity makes it difficult to predict how these scale from individual reaches river basins. Recent work applying allometric scaling (i.e., power‐law relationships between size function) networks provides a new paradigm for understanding cumulative hyporheic processes. We used previously published model predictions of reach‐scale aerobic respiration explore patterns across two...
Abstract. Understanding aquatic ecosystem metabolism involves the study of two key processes: carbon fixation via primary production and organic C mineralization as total respiration (ERtot). In streams rivers, ERtot includes in water column (ERwc) sediments (ERsed). While literature surveys suggest that ERsed is often a dominant contributor to ERtot, recent studies indicate relative influence sediment-associated processes versus can fluctuate along river continuum. Still, comprehensive...
Abstract Climate warming will have substantial impacts on hydrological fluxes in the California Sierra. A commonly used approach for assessing these impacts, particularly mountain watersheds, is to substitute space time. This conceptual model assumes that with warming, hydrologic behaviour of higher elevation snow dominated watersheds (SDWs) converge lower transient (TSWs). To investigate efficacy this model, a process‐based (RHESSys) was applied TSW and SDW mean annual temperature 2 °C than...
Abstract The potential for increased loads of dissolved organic carbon (DOC) in streams and rivers is a concern regulating the water quality supply watersheds. With increasing hydroclimatic variability related to global warming shifts forest ecosystem community structure, understanding predicting magnitude watershed transport DOC over multiple time scales have become important research management goals. In this study, we use distributed process‐based ecohydrological model (Regional...
A large amount of dissolved organic matter (DOM) is transported to the ocean from terrestrial inputs each year (~0.95 Pg C per year) and undergoes a series abiotic biotic reactions, causing significant release CO 2 . Combined, these reactions result in variable DOM characteristics (e.g., nominal oxidation state carbon, double-bond equivalents, chemodiversity) which have demonstrated impacts on biogeochemistry ecosystem function. Despite this importance, however, comparatively few studies...
Abstract While the hyporheic zone (HZ) accounts for a significant portion of whole stream CO 2 concentrations, HZ respiration modeling studies are lacking in quantifying their contributions to total at large watershed/basin scales. Quantifying contribution anaerobic is also underappreciated. This study used carbon‐nitrogen‐coupled river corridor model quantify aerobic and determined key factors controlling spatial variability within Columbia River Basin (CRB). The modeled patterns showed...
Abstract In agriculture‐dominated watersheds where natural drainage is poor, agricultural ditches (narrow engineered channels) and tile drains (perforated pipes) are widely employed to enhance surface subsurface drainage, respectively. Despite their relatively small scale, these features exert substantial control over the hydro‐biogeochemical function of effects need be represented in models. We introduce a novel strategy incorporate artificial into fully distributed basin‐scale integrated...
The effect of fine-scale topographic variability on model estimates ecohydrologic responses to climate in California’s Sierra Nevada watersheds has not been adequately quantified and may be important for supporting reliable climate-impact assessments. This study tested the digital elevation (DEM) resolution accuracy sensitivity inter-annual variability. Regional Hydro-Ecologic Simulation System (RHESSys) was applied eight headwater, high-elevation located Kings River drainage basin. Each...
Figure S1.Field sites, Yakima River basin catchments sharing similar landscape characteristics and observed water column respiration rates across the basin, Washington, USA.(a) Field sites from 2021 spatial study superimposed on a map of catchment cluster analysis results.U. S. Geological Survey National Hydrography Dataset Plus Version 2.1 (NHDPlusV2.1)catchments were grouped into six classes using key biophysical hydrologic variables characterized 5 according to tree height, precipitation,...
Abstract. Aerobic respiration of organic matter is a key metabolic process influencing carbon (C) biogeochemistry in aquatic ecosystems. Anthropogenic and environmental perturbations to stream ecosystem metabolism can have deleterious effects on downstream water quality. Various features rivers also influence metabolism, including physical (e.g., discharge, light, flow regimes) chemical factors (nutrients, matter) watershed characteristics size or drainage area, land use). The relative...
Abstract Areas where groundwater and surface water mix (i.e., hyporheic zones, HZ) contribute substantially to stream ecosystem respiration (ERtot). We rely on reactive transport models understand HZ at large scales; however, model outputs have not been evaluated with field estimates of ERtot. Here we evaluate the degree which spatial variation in model-predicted can explain field-estimated ERtot across 32 sites Yakima River basin (YRB). find that predicted did hypothesize is influenced by...
Abstract Denitrification in the hyporheic zone (HZ) of river corridors is crucial to removing excess nitrogen rivers from anthropogenic activities. However, previous modeling studies effectiveness via denitrification were often limited reach‐scale and low‐order stream watersheds. We developed a basin‐scale corridor model for Columbia River Basin with random forest models identify dominant factors associated spatial variation HZ denitrification. Our results suggest that combined effects...
Watershed models such as the Soil and Water Assessment Tool (SWAT) consist of high-dimensional physical empirical parameters. These parameters often need to be estimated/calibrated through inverse modeling produce reliable predictions on hydrological fluxes states. Existing parameter estimation methods can time consuming, inefficient, computationally expensive for problems. In this paper, we present an accurate robust method calibrate SWAT model (i.e., 20 parameters) using scalable deep...
Watershed models such as the Soil and Water Assessment Tool (SWAT) consist of high-dimensional physical empirical parameters. These parameters need to be accurately calibrated for produce reliable predictions streamflow, evapotranspiration, snow water equivalent, nutrient loading. Existing parameter estimation methods are time-consuming, inefficient, computationally intensive, with reduced accuracy when estimating In this paper, we present a fast, accurate, methodology calibrate SWAT model...
SWAT 모형을 이용하여 대전 3대 하천 유역의 수문 분석 및 도시화에 따른 영향을 평가하였다. 물수지 분석결과에 의하면, 전체적으로 총 유출량 중 지하수 유출량이 44%정도, 중간 6% 그리고 지표유출량이 50%이다. 도시화 영향 결과 1975년에서 2000년까지 갑천유역의 약 5%가량의 도시화는 유출량의 변화에 있어서는 현저한 차이를 보이지 않았으나, 율이 32%정도 증가한 소유역의 경우 유출 성분 분석에서 첨두 유량의 <TEX>$25{\sim}66%$</TEX>의 증가를 보였고, <TEX>$68{\sim}73%$</TEX>의 감소를 확인 할 수 있었다. 도시화의 영향으로 토양수분량은 건기를 제외한 모든 시기동안 감소한 반면 침투량은 감소하였다. 영향은 강우량이 적고, 증발량이 많은 갈수년에 더 크게 나타났다. 이 결과로부터 풍수기 동안의 홍수피해 폰가 갈수기 하천의 건천화 문제를 유추 있을 것이다. 결론적으로 본 연구에서 수행한 수문분석 영향분석 결과는 향후 대천...