video banjir badai cempaka

Summary

The video discusses the impact of Cyclone Cempaka, which caused extreme weather in Java and DIY, leading to heavy rainfall, strong winds, and flooding in areas like Gunung Sewu. The speaker explains the natural phenomenon of floods in karst areas, focusing on the four main types of floods: those caused by alogenic rivers, internal runoff in karst basins, water overflow through karst windows, and floods at spring sources. The speaker emphasizes how intense rainfall can overwhelm karst systems, leading to significant flooding, with real examples from the recent events in Wonogiri and other affected areas.

Takeaways

• 😀 Tropical cyclones are low-pressure systems that can cause storms, as seen with Cyclone Cempaka, which formed on November 27 and led to severe weather in regions like Java and DIY.
• 🌧️ The interaction between moist air from the west and wind changes around Java and DIY led to unstable conditions and the potential for extreme weather, including heavy rainfall and strong winds.
• 🌪️ The extreme weather also caused flooding, high waves, and strong winds, particularly in areas like the Gunung Sewu Karst region.
• 🌍 The Karst area, especially in Gunung Sewu, frequently experiences natural flooding events due to its unique morphology and hydrology.
• 🧑‍🔬 Local residents in Gunung Sewu reported that this event was the first of its kind for many, despite similar occurrences happening naturally in the area before.
• 🌊 The flooding in Gunung Sewu involved a process where water filled caverns and eventually caused collapses when it became too concentrated, resulting in floods.
• 🚨 The primary cause of flooding was the intensity of rainfall, which exceeded the capacity of underground river systems to drain water effectively.
• ⛲ One significant type of flooding is caused by alogenic rivers—surface rivers that flow into underground river systems, which can cause broad flooding outside Karst areas when there’s heavy rainfall.
• 💧 Another type of flooding is internal runoff, where rainwater accumulates in depressions or closed basins in Karst areas, and is released through a single drainage point, such as a ponor (sinkhole).
• 🌿 Floods caused by sinkholes can be severe, as evidenced by the flooding in Tanjungsari Vocational School and Wonogiri Karst Museum due to high rainfall.
• 🏞️ The fourth type of flooding is caused by rising spring waters, where high rainfall increases the flow of water from springs, leading to localized flooding in surrounding areas, as seen in Beton spring.

Q & A

What is Siklon Tropis, and how does it affect weather patterns?

Siklon Tropis is a low-pressure system in synoptic scale, associated with storm activity. In the case of the November 27 event, it formed into a tropical cyclone named Cempaka. It led to unstable weather conditions in the regions of Java and DIY, causing extreme weather such as heavy rain, strong winds, and floods.

What were the key weather impacts caused by Cyclone Cempaka?

Cyclone Cempaka caused significant weather disturbances, including intense rainfall, strong winds, whirlwind (puting beliung), and high waves. These extreme conditions led to flooding in areas such as Kars Gunung Sewu.

How does the morphology of Kars in the Gunung Sewu region relate to flooding?

The Kars morphology in the Gunung Sewu region is naturally prone to flooding. The presence of sinkholes and underground river systems contributes to the area’s vulnerability to water overflow during heavy rainfall.

What is the significance of the Kars formations around Kali Suci?

The Kars formations around Kali Suci, including caves and sinkholes like Jomblang and Grubo, are part of the natural process that can lead to flooding. Water fills these spaces and often spills over, especially when the rainfall exceeds the drainage capacity of underground rivers.

What are the four types of flooding mentioned in the transcript?

The four types of flooding discussed are: 1) Flooding caused by alogenic rivers (rivers that flow into underground systems), 2) Flooding due to internal runoff in Kars formations, 3) Flooding from overflow at KS windows (entrances to underground rivers), and 4) Flooding from springs, where large amounts of water emerge during heavy rainfall.

What causes alogenic river flooding in Kars areas?

Alogenic river flooding occurs when surface rivers enter underground river systems. During heavy rainfall, surface water surges into the underground network, which often has limited capacity to handle the increased flow, leading to floods in areas outside the Kars region.

How do KS windows contribute to flooding in the Gunung Sewu area?

KS windows, which are openings in cave systems that allow underground rivers to flow, have limited capacity to manage large amounts of water. When there is a sudden influx of water due to heavy rainfall, these windows become blocked, causing overflow and flooding in surrounding areas.

What is the role of ponors in Kars-related flooding?

Ponsors, or natural drainage holes in Kars regions, play a critical role in managing water flow. They allow water from closed depressions to drain, but when rainfall is too intense, the ponors cannot handle the excess water, leading to flooding in nearby areas.

Can you give an example of internal flooding in the Kars region?

An example of internal flooding is the case at SMK Tanjungsari and the Kars Museum in Wonogiri, where heavy rainfall caused water to flood the closed depressions, surpassing the drainage capacity of the ponors.

What is the relationship between spring water and flooding in Kars areas?

Spring water can contribute to flooding when large volumes of water emerge from springs following heavy rainfall. This excess water overflows, inundating the area below the spring, such as the flooding incident at Mata Air Beton.