WORLDWIDE CHRONIC LEVELS OF INSECTICIDES IN RIVERS CONTINUE TO RISE, WHICH HAVE SIGNIFICANT HUMAN HEALTH AND FOOD SECURITYIMPLICATIONS. INSECTICIDES, ONCE IN THE ENVIRONMENT, ARE EXPOSED TO A RANGE OF ENVIRONMENTAL CONDITIONS, RESULTING IN DEGRADATIONAND FORMATION OF POTENTIALLY HARMFUL BYPRODUCTS. THE OVERARCHING GOAL OF THE PROPOSED WORK IS TO QUANTIFY THE POTENTIAL ROLE OFRIVER GEOMORPHOLOGY ON PHOTOCHEMICAL TRANSFORMATION FATE AND DEGRADATION RATES OF TWO INSECTICIDES THAT ARE CONTAMINANTS OFEMERGING CONCERN (CECS): IMIDACLOPRID AND CLOTHIANDIN. PATH-SPECIFIC ENVIRONMENTAL CONDITIONS OF TWO AGRICULTURAL IMPACTEDRIVERS IN THE MIDWEST AND SOUTHEAST WILL BE ASSESSED. OBJECTIVES INCLUDE THREE COUPLED FIELD/LABORATORY RESEARCH SCHEMES: 1.SYPNOTIC, 2. EULERIAN, AND 3. LAGRANGIAN. EACH OBJECTIVE WILL INCORPORATE THE DEVELOPMENT OF ALTERNATIVE FIELD AND SENSOR-BASEDAPPROACHES FOR STUDYING RIVERS IN AGROECOSYSTEMS. THE NOVELTY OF THE PROPOSED WORK IS WE WILL CONCEPTUALLY ANDMETHODOLOGICALLY FOLLOW VARIABLE CONDITIONS EXPERIENCED BY A WATER PARTICLE AS IT TRAVELS THROUGH A RIVER USING PASSIVE DRIFTINGSENSORS, ULTIMATELY PROVIDING A MORE ACCURATE PICTURE OF CEC FATE AND TRANSPORT.THE PROPOSED WORK WILL ADDRESS TWO GOALS OF THE BNRE PROGRAM: 1. FOUNDATIONAL RESEARCH TO ADVANCE SCIENTIFIC UNDERSTANDINGOF PROCESSES AND INTERACTIONS OF CECS IN AGRICULTURAL SYSTEMS AND 2. DEVELOPMENT OF CEC FATE AND TRANSPORT MODELS FORAGRICULTURAL REGIONS. EXPECTED DELIVERABLES INCLUDE: 1. PROVIDE REALISTIC RECOMMENDATIONS FOR MINIMIZING ENVIRONMENTAL IMPACTSOF THESE INSECTICIDES, 2. IMPROVE CURRENT FATE AND TRANSPORT METHODOLOGY THAT WILL BE TRANSFERABLE AND SCALABLE TO OTHER QUESTIONSIN RIVERS ADJACENT TO AGROSYSTEMS (E.G., NUTRIENT RETENTION), AND 3. PROVIDE UNDERGRADUATE AND GRADUATE TRAINING.