Research Article Estimation of Suspended Sediment Concentration from Remote Sensing and In Situ Measurement over Lake Tana, Ethiopia ZelalemR.Womber , 1 FasikawA.Zimale , 1 MebrahtomG.Kebedew, 1 BekaluW.Asers, 1 Nikole M. DeLuca, 2 Christian D. Guzman , 3 Seifu A. Tilahun , 1 and Benjamin F. Zaitchik 2 1 Bahir Dar Institute of Technology, Bahir Dar University, Bahir Dar, Ethiopia 2 Johns Hopkins University, Earth and Planetary Sciences, Baltimore, USA 3 Civil and Environmental Engineering, University of Massachusetts, Amherst, MA, USA CorrespondenceshouldbeaddressedtoFasikawA.Zimale;fasikaw@gmail.com Received 19 March 2021; Revised 29 June 2021; Accepted 7 July 2021; Published 22 July 2021 AcademicEditor:MosbehKaloop Copyright©2021ZelalemR.Womberetal.isisanopenaccessarticledistributedundertheCreativeCommonsAttribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properlycited. Discharge from basins joining a lake is the main factor determining the lake volume and sediment inflow to the lake. Suspended sedimentisanimportantparameterfordescribingthewaterqualityofaquaticecosystems.LakeTanaisanimportantandthelargestlake inEthiopiaforthelocalecologicalsystem.However,environmentalchangeandanthropogenicactivitiesintheareathreatenitswater quality.econventionalmethodsofsuspendedsedimentconcentration(SSC)observationareunabletodetermineandcomparespatial andtemporalSSCpatternsforthelakeoveraperiodofyears.RemotesensingmethodshavemadeitpossibletomapSSC.eobjective ofthisstudyistocharacterizethespatialandtemporaldistributionofsuspendedsedimentofLakeTanausinginsitumeasurementand remote sensing applications and specifically to develop a relationship between in situ and remote sensing observation to retrieve suspendedsedimentconcentrationandmapthespataldistributionofSSC.isstudyusedMODIS-Terraandinsitudatatocharacterize thespatialandtemporaldistributionofSSCintherainyseason.Foursamplingcampaigns(20samplespercampaign)werecarriedout on Lake Tana, and the first three sampled campaigns on May 11–13, 2018, June 08–10, 2018, and July 15–17, 2018, were used for calibrationofregressionmodels.MODIS-TerrareflectanceinNIRwasfoundbestrelatedtoinsituwaterqualitydataandvarieslinearly withSSC(r 2 � 0.81)andturbidity(r 2 � 0.85).Secchidiscdepth(SDD)foundthebestfitforapowerrelationwithNIRbandreflectance (r 2 � 0.74).eMODIS-Terrareflectanceinredwasfoundtobepoorlyrelatedtoinsitumeasurements.erelationinNIRreflectance wasvalidatedusingtheLOOCV(leave-one-out-cross-validation)techniqueandthefourthsampleddatasetcollectedonAugust12–14, 2018.DevelopedmodelsarevalidatedwithRMSEof42.96mg/l,14.6NTU,and0.17m,AREof23.3%,27.6%,and12.4%,andRRMSEof 25.1%,44.5%,and29.6%forSSC,turbidity,andSDD,respectively,usingLOOCV.eequationwasalsovalidatedusingAugust2018 collecteddatasetswithRMSEof87.6mg/l,11.7NTU,0.08m,AREof20.8%,25.9%,and28.8%,andRRMSEof17.8%,20.5%,and27.9% forSSC,turbidity,andSDD,respectively.Applyingthedevelopedregressionmodel,a10-yeartimeseriesofSSCfrom2008–2017for May-AugustwasestimatedandthetrendwastestedusingtheMann–Kendalltrendtest.Itwasfoundthatanincreasingtrendwas observedfromtheperiod2008to2017.eresultshowsthatsatellitedataliketheMODIS-Terraimagerycouldbeusedtomonitorand obtainpastrecordsofSSCwiththedevelopedequation.eincreasingSSCcanbereducedbyimplementingselectedmanagement practices in the surrounding watersheds of the lake to reduce nutrient and sediment inflow. 1. Introduction Discharge from basins entering a lake is the main deter- minantofthelakevolumeandsedimentinflowintothelake. Suspended sediment concentration is an important parameter for describing lake water quality [1]. Water transports suspended sediments/solids, nutrients, and contaminants, which again reduce light transmission through a water column and influence entire aquatic eco- systems[1–3]. Hindawi Advances in Civil Engineering Volume 2021, Article ID 9948780, 17 pages https://doi.org/10.1155/2021/9948780