Analysis on the adjustable water volume of the Middle Route of South-to-North Water Transfers Project after the implementation of the water diversion from Three Gorges Reservoir to Hanjiang River
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Abstract:
The ?Middle ?Route ?of ?South-to-North ?Water ?Transfers ?Project ?(MRSWTP) ?is ?a ?major ?strategic infrastructure?to?alleviate?the?serious?shortage?of?water?resources?in?northern?China.?The?first?phase?of?the?MRSWTP has?been?put?into?operation?since?2014.?By?the?8th?anniversary?of?the?operation?of?the?MRSWTP?on?December?12, 2022,?the?cumulative?water?inflow?from?the?head?of?the?Taocha?Canal?has?exceeded?53?billion?m 3,?with?a?direct beneficiary?population?of?more?than?85?million?people.?Thus,?the?completion?and?operation?of?the?Middle?Route?of South-to-North?Water?Transfers?Project?(MRSWTP)?have?significantly?improved?the?water?resources?conditions?and water?supply?guarantee?degree?of?the?cities?in?the?water?receiving?area?of?the?middle?route,?and?achieved?great?social and?economic?benefits.?In?the?face?of?the?needs?of?the?national?development?strategy?in?the?new?era,?the?supply?and demand ?sides ?of ?the ?water ?resources ?allocation ?of ?the ?MRSWTP ?have ?changed. ?On ?the ?one ?hand, ?with ?the coordinated?development?of?Beijing-Tianjin-Hebei?and?the?construction?of?Xiong'an?New?Area,?the?water?supply objects?and?scope?of?the?MRSWTP?have?been?expanded?and?adjusted,?and?the?water?transferred?from?the?MRSWTP has?become?the?main?water?source?of?large?and?medium-sized?urban?areas?along?the?Beijing-Tianjin-Hebei?line.?The current?change?of?water?supply?situation?puts?forward?new?water?transfer?requirements?for?the?MRSWTP?in?terms?of water?quantity?and?water?supply?guarantee.?On?the?other?hand,?the?inter-annual?variation?of?the?incoming?water?from the?Hanjiang?River?basin?is?large,?which?has?affected?the?water?supply?guarantee?of?the?Danjiangkou?Reservoir.?With the?commencement?of?the?construction?of?the?water?diversion?project?from?Three?Gorges?Reservoir?to?Hanjiang River?(WDP-TH),?it?is?very?necessary?to?carry?out?the?research?on?the?joint?operation?mode?of?the?Danjiangkou Reservoir?and?the?WDP-TH. ??????Based ?on ?the ?design ?parameters ?of ?the ?WDP-TH, ?the ?adjustable ?water ?volume ?of ?the ?MRSWTP ?after ?the implementation?of?the?WDP-TH?is?analyzed?and?four?research?schemes?are?put?forward?as?follows:?(1)?Scheme?1, the?current?water?supply?operating?scenario?of?the?Danjiangkou?Reservoir,?which?is?the?benchmark?scheme;?(2) Scheme?2,?the?WDP-TH?starts?to?transfer?water?when?the?reservoir?release?can?not?satisfy?the?minimum?discharge flow?requirements?of?the?downstream?section;?(3)?Scheme?3,?the?water?transfer?control?line?of?the?WDP-TH?is?added in ?the ?water ?supply ?operating ?curves ?of ?the ?Danjiangkou ?Reservoir, ?and ?water ?transfers ?rules ?of ?Taocha ?are optimized?synchronously;?and?(4)?Scheme?4,?the?WDP-TH?continuously?transfers?water?to?the?middle?and?lower reaches?of?the?Hanjiang?River?throughout?the?year,?and?the?transfers?flow?of?the?Taocha?is?420?m3/s. ??????The?results?show?that?the?effective?connection?between?the?water?supply?of?Danjiangkou?Reservoir?and?the?water supply?decision?of?the?water?transfers?project?can?be?realized?by?two?schemes,?i.e.,?Scheme?3?and?Scheme?4,?both?of which?can?effectively?use?the?water?transfers?of?the?WDP-TH?to?increase?the?available?water?supply?volume?of?the MRSWTP?(the?increment?is?1.77?billion?m3?to?2.58?billion?m3.)?and?reduce?the?reservoir?waste?water?(the?decrease?is 10.5?billion?m3?to?14.8?billion?m3)?on?the?premise?of?ensuring?the?water?demand?of?the?middle?and?lower?reaches?of the?Hanjiang?River. ??????This?research?can?provide?technical?support?for?the?adjustment?of?the?water?transfer?mode?of?the?MRSWTP?after the?completion?of?the?WDP-TH?in?the?future,?and?realize?effective?connection?between?the?above?two?projects.
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