Watershed

Oral

389714 - Curve number model development for estimating sediment yield of an ungagged watershed in Alabama

Monday, June 4
2:00 PM - 3:30 PM
Location: Greenway IJ
Co-Authors: Xing Fang, Auburn, Alabama USA – Auburn University; Jose Vasconcelos, Auburn, Alabama USA – Auburn University

Many watersheds in the southeast Alabama contain a large percent of sandy soil that is excellent for various types of crops but may result in aggradation in streams, which blocks the bridge openings and causes the local flooding and potential structural damage to the bridge. The higher sensitivity of curve number method and difficulty in finding a donor catchment with equivalent land cover composition makes it unsuitable for prediction in an ungauged catchment. However, the requirement of lower number of parameters and ease in the application makes curve number method highly desirable for hydrologic applications. The objective of the study is to develop a calibrated curve number model from a less parameter sensitive and transfer validated continuous soil moisture accounting model to predict flow and consequently sediment yield in an ungauged catchment where aggradation has occurred. High-resolution NAIP aerial imagery was processed through unsupervised classification scheme and then combined with soil data available through USDA to obtain curve number grid for the watershed. Locally developed curve number model was calibrated using soil moisture accounting model of Soapstone Branch, AL for different antecedent moisture condition. Finally, flow and sediment yield of different storm events were simulated using calibrated curve number model and modified universal soil loss equation. The study helps state and county agencies to diagnose contributing factors of the aggradation and propose strategies to solve the aggradation problem in the watershed.

Sagar K. Tamang, MS

Research Assistant, PhD student
University of Minnesota

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389714 - Curve number model development for estimating sediment yield of an ungagged watershed in Alabama



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