用水システムの運用操作における流量の応答遅れ
スポンサーリンク
概要
- 論文の詳細を見る
The operation of discharge and delay of response in a open-channel irrigation system were discussed with mathematical analyses and experimental evalualions. Analytical treatments were made based on the linearized diffusion analog model. [1] It was clarified that parameter αobtained as a result of the analyses was an effective factor to describe the response of the operation, and α was denoted as α=√X=√T …（A) in which, <special>X=w0x/4µ0</special>, <special>T=w02t/4µ0</special> X : Distance represented non-dimensionally, T : time represented non-dimensionally, x : distance from the upside end of open-channel (m）, t : time from the change of discharge（sec）, <special>w0</special> : velocity of hydraulic bore（m/sec）, µ : equivalent to<special>（hv)/2i</special>, <special>（hv)</special> discharge per unit wise of channel, suffix 0 shows uniform flow and <special>i</special> ; bottom slope. Also, the phenomena of the response in the operations were transferred to down stream as dynamic, dynamic～kinematic and kinematic waves for α≪1, ユ，<special>α=1 and α≫1</special>, respectively. [2] A simple and useful equation was derived as a result of solving the linearized diffusion analog model with in the effective range of X. <special>X-T/√T= {1.0(KQ=0.1, 0.1≦X≦10.0) 0.0(KQ=2/3, 0.1≦X≦10.0) -0.6(KQ=0.9, X≒1.0)</special> in which, the folowing indexes were introduced to evaluate the conditions of response with the operation. （1） <special>KQ</special>=0.1is the beginning index of the response. （2） <special>KQ</special>=2／3 is the progressive state index. （3） <special>KQ</special>＝0．9 is the ending index of the response. <special>KQ</special> : Discharge represented non-dimensionally, equivalent to <special>（Q－Qb）/（Qb－Qb）</special>, Q : discharge<special>（m3/sec)</special>, suffix b shows the uniform flow just before the operation and suffix <special>e</special> shows the uniform flow at the end of the response. The validity of Eq. （B） was confirmed in the transition range of the dynamic and kinematic waves. [3] The Eqs. （C） and （D） were applied to evaluate dead time D（sec） and time constant <special>Tc</special>（sec） in the indicial response of flow in an open-channel under various conditions. <special>D+TC=l/w0</special> …（C） <special>w0l/4µb-w02D/4µb =√w02D/4µb</special> …（D) Equation (C) was derived from the condion of continuity and Eq. （D） was derived from Eq. （B). The mathematical model fo revaluting deal time D and time constant <special>Tc</special> of the flow in an open-channel with step works in series was presented and checked using a numerical analysis. The validity of this model was confirmed within about 10 step works in a open-channel.
著者
関連論文
- 水田の暗渠排水管内流れへの暗渠埋設深と埋設勾配の影響
- 礫耕施設トマトの培養液電気伝導度と蒸散強度および養分吸収度の関係
- 礫耕施設トマトの蒸散量測定に関する実験的研究
- 用水システムの運用操作における流量の応答遅れ
- 直達・散乱両入射光成分アルベドの評価について--土壌アルベドの日変化機構に関する研究-2-
- 先行降雨指数による渓流取水の評価事例
- 自由度考慮の提案--平面上3角測量調整計算の平易化を例に
- 水質特性を重視した衛星データによるダム湖湖面水質の評価
- 新宮藺沢浮島の浮動状況測定結果
- 造成農地の飽和帯における地中流の流出形態
- 衛星データによるダム湖湖面のSSとクロロフィルaの濃度比
- 地表面下の変動流出寄与域の推定式と造成階段畑への適用例
- 先行降雨指数を用いた沼沢地の灌漑制御方法に関する研究
- 特性曲線法による造成階段畑内変動流出寄与域の逆推定
- 先行降雨指数と畑地内サクションの関係
- 表面流出モデルによる有効降雨の逆推定
- 既設の水路と水槽を利用した流出解析のための流量観測
- 最適直径指数と張力類似モデルによる管路分岐
- 幹線管水路系の最適直径指数