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Identificationofgeomorphicunitandanalysisofheterogeneityin
smallhydropowerterracedevelopmentriversections
YUZicheng,ZHANGJing,ZHAOJinyong,PENGWenqi,DINGYang,WANGQi
(DepartmentofWaterEcologyandEnvironment,ChinaInstituteofWaterResourcesandHydropowerResearch,
Beijing 100038,China)
Abstract:Thescientificclassificationandidentificationofrivergeomorphicunitsisconducivetotheaccurate
positioningofaquatichabitatsandprovidesabasisforthescientificassessmentoftheecologicalimpactofsmall
hydropowerandtherestorationofdamagedriverhabitats.BasedonthehydrologicaldataofDaningRiver ,thefirst
tributaryoftheYangtzeRiverfrom1972to2016 ,twohydrologicalcatastrophepointsaredeterminedbyusingthe
methodsofcumulativeanomaly ,slidingt - testandIHA- RVA,andthehydrologicalchangedegreesofthree
differentstagesbeforevariation ,variationstage Ⅰ andvariationstage Ⅱ areanalyzedandcompared;Onthebasis
ofsummarizingthepreviousclassificationsystem ,accordingtothefieldinvestigationandobservationdatainthe
periodoflowhydrologicalchange ,combinedwiththeprocessformrelationshipofgeomorphicunits,thetypesand
spatialdistributionofgeomorphicunitsinR1~R8reachfrom upstream todownstream inthestudyareaare
determined,andthegeomorphicunitrichnessindex(R)isintroducedDensityindex(D)anddiversityindex
(H d )areusedtoquantitativelyevaluatethegeomorphicheterogeneityofthestudiedriverreach.Theresultsshow
thattheaveragevalueofhydrologicalchangedegreeineachmonthofvariationstageIandvariationstageIIis
15.53% and24.42% comparedwiththatbeforevariation ;TheaveragevaluesofR,DandH d ofR1~R4(small
hydropowercascadedevelopmentreach )arelessthanR5~R8(relativelynaturalsection),withadifferenceof
9%,32.1% and17.2% respectively.Thegeomorphicheterogeneityofsmallhydropowercascadedevelopment
reachneedstobeimproved.Thestudyquantitativelyevaluatesthegeomorphicheterogeneityoftheriversectionand
canprovidedecisionsupportfortheclassifiedrectificationofsmallhydropowerfrom theperspectiveofriver
geomorphology.
Keywords:rivergeomorphicunit;identification;heterogeneity;divertedsmallhydropower;terracedevelopment
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