تاثير دماغه و ديواره جان پناه سرريز كليد پيانويي بر انسداد اجسام شناور

Effects of Nose and Piano Keys Weir Parapet Wall on Floating Woody Debris

سرريزهاي كليد پيانويي نوع جديدي از سرريزها هستند كه ظرفيت تخليه دبي بسيار بالايي دارند به طوري كه براي يك دبي ثابت عمق آب روي اين نوع سرريز كم بوده و همين عامل احتمال انسداد ناشي از تجمع اجسام شناور را افزايش مي دهد. در اين تحقيق با استفاده از سه مدل آزمايشگاهي سرريز كليد پيانويي و پنج نمونه چوب، تاثير اجسام شناور بر ميزان انسداد بررسي شده است. نتايج نشان داد مدل سرريز با ديواره جان پناه و دماغه (PKWPN) نسبت به مدل سرريز با ديواره جان پناه (PKWP) و مدل ساده (PKW) حساسيت كمتري به انسداد دارد. احتمال گرفتگي در مدل PKWPN نسبت به دو مدل ديگر به همان ترتيبي كه ذكر شد داراي 6 و۱۵/۶ درصد كمتر بود. همچنين مشاهده گرديد احتمال انسداد در مدخل كليد خروجي و شيرواني ها بيشتر از ساير اجزاء سرريز كليد پيانويي است و در يك انرژي ثابت احتمال انسداد نمونه چوب هاي شاخه دار بيش از نمونه هاي صاف مي باشد.

A hydraulic structure is a device designed to retain، regulate، or control the flow of water. The most common type of hydraulic structures are weirs. Weirs are overflow structures that stretch across an open channel of water، and are meant to alter the channel’s flow characteristics making it easier to measure the volumetric rate of water flow. The Piano Key Weir (PKW)، a type of Labyrinth weir is a hydraulically attractive option to linear overflow weirs، increasing the unit discharge for similar heads and spillway widths (Anderson، 2011). Together with its high discharge capacity for low heads، this geometry makes these weirs interesting in dam (Laugier، 2007). Discharge passing capacity of piano key weir is higher than that of labyrinth weir for same condition (Anderson and Tullis، 2013). In PKW type A، the upstream and downstream overhangs are existence، and if PK weir without downstream، upstream or both overhangs، it is B، C and D respectively (Lemperier and Quamane، 2003). Anytime an engineered structure like a weir structure is placed in a river environment، the possibility exists that it will encounter debris. The impact of this debris on a structure is an important aspect of the design (Pagliara and Carnacina، 2010). Historically، debris accumulation on bridge piers and hydroelectric dams has been among the chief concerns associated with river debris. As the amount of debris builds on an object، the force it exerts on the object can result in catastrophic failure and it reduces the flow، resulting in the buildup of a backwater and greatly reducing the efficiency of energy conversion. Due to the geometric properties and low flow head of PK weir، floating debris obstruction can occur in this structure. As shown in Fig.1، fundamental parameters on a PKW are including: height of PK-Weir P، total width of PK-Weir W، inlet key width Wi، outlet key width Wo، length of PKW B، PK weir footprint length Bb، upstream (outlet key) overhang lengths Bo، downstream (inlet key) overhang lengths Bi، weir wall thickness Ts، and flow discharge Q. In this research the effect of floating debris on PK weir obstruction investigated experimentally. The geometry of PKW and debris parameter was studied.