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06/09/2025

APO CARIDAD, KAASSIANNA KAMI ||

05/09/2025

NOW HIRING ||
BCS GROUP OF COMPANIES

To all interested applicants, you may submit your resume at the store and look for the manager on duty or send via email: [email protected]

In sending your application via email, p𝘭𝘦𝘢𝘴𝘦 𝘪𝘯𝘥𝘪𝘤𝘢𝘵𝘦 the 𝘗𝘖𝘚𝘐𝘛𝘐𝘖𝘕 you're applying for.
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05/09/2025

BAGYO UPDATES FROM DOST-PAGASA ||
TD LANNIE batog iti Sinait Ilocos Sur

READ more from DOST-PAGASA👇
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05/09/2025

SEPTEMBER IS TOURISM MONTH ||
INTAYON diay Ciudad ti Vigan maki-TOURISM WEEK CELEBRATION 2025 kaiBIGAN!

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05/09/2025

FOOD TOURISM IN VIGAN ||
LUBI-LUBI TI SAN JULIAN SUR

BIGAN Online joins the nation in celebrating the 2025 Tourism Month.

LUBI-LUBI is the One Barangay, One Product of San Julian Sur, Vigan CIty. Let's us enjoy the foods of Vigan kaiBIGAN. For orders, contact the Barangay San Julian Sur Council.

If you are interested to promote your One Barangay, One Product, just contact BIGAN Online kaiBIGAN.

04/09/2025

NEPNEP ||
Weather Updates from DOST-PAGASA👇
https://www.facebook.com/share/18Z5GastJ7/

04/09/2025

Big shout out to our newest top fans! 💎 Sonata TiVigan, Jade Val, Rojay Casty, Dominic Aspa, Joseph Dagondon Daquioag, Ailed Castañeda Palacpac, Lourdes Barcesa Padriquel, Adan Espiritu, Emogin Jara Andallo, Mark Gregory Dela Cruz, Remy Paroligan Paz, Laura Arconado, Anna Belle, Nette T. Punio, Maricris Ribuyaco, Loreta Ablog Benzon, Michael Irvin Rabena, Melissa Taer, Dennis Cachero, Jhe Divina Pajarillo, Apolonia Castillo Mandac, Mary Jane Paz Paat, Joyce Garcia, Jeffrey Velasco, Mely Melai Figares Espejo, Rowena Ubiña, Vicky Sison Reotutar, Margie Abella, Lucia Arenas, Sonny Abero Alaibilla, Melissa Ablog Molina, Danilo Tongson, Rolly Pichay, Cecil Apelin, Eleuterio Afroilan, Pilar Tubera, Jeffrey Pascua, Eric Almerido, Kajang Bc Yobar, George C. Lee, Feliza Valledor, Hilda P. Flores, Vilma Pinzon, Leoncio Abigania, Raul Lagonera, Elsa Quibo Borce, Mark Jayson Alconis, Napoleon Castillo Labuguen, Lala Espiritu

Drop a comment to welcome them to our community, fans

04/09/2025

MOTHER TERESA kaassianna Kami 🙏

04/09/2025

Ay, Apo
Kimmidag
manen🙏

04/09/2025

JUST IN ||
DOJ LOOKOUT ORDER FOR 43 DWPH CONTRACTORS

ADDA ba taga Ilocos Sur ditoy kaiBIGAN? READ more from INQUIRER.net 👇
https://www.facebook.com/share/p/15cHcCm979/

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04/09/2025

NEPNEP ||
READ more Weather Updates from DOST-PAGASA👇
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04/09/2025

INSIGHTS ||
BASA-BASA RIN KAP PAG MAY TIME. SCIENTIST ITI NANGIBAGAN DAYTOYEN A SAAN NGA SAYANGTIS KADA PILOSOPO

SAND MINING & DREDGING AS MAJOR DRIVERS OF COASAL EROSION
(Insights from Dr. Fernando Siringan from the UP-MSI and colleagues)
⸻
🔍 1. How Sand Mining and Dredging Cause Erosion
Coastal zones are dynamic systems where sediment is constantly transported between land, beach, reef, and sea. Sand mining and dredging disrupt this balance by:
• Removing beach or nearshore sediments faster than they can be replenished.
• Lowering the seabed near the shore, which:
• Deepens wave energy pe*******on.
• Causes stronger wave backwash and scouring.
• Interrupting sediment supply from rivers and reefs.
• Triggering long-term beach retreat and dune collapse.
As Dr. Siringan explains in multiple works:
“Once you remove sand from the beach or its nearshore zone, the shoreline adjusts by eroding landward to try and rebalance itself.”
(Paraphrased from San Fernando Bay study, MSI-UP)
⸻
📍 2. Case Example: San Fernando Bay, La Union
• Mining Period: 1960s–1990s
• What Happened:
• Sand was extracted from the beach and river mouths for construction and land reclamation.
• Over time, shoreline retreated by up to 2 meters/year in some barangays (e.g., Pagudpud, San Francisco Norte).
• Dunes shrank in height and volume; seawalls were built to compensate, which only made erosion worse on nearby unprotected stretches.
• Findings by Dr. Siringan (2003–2010):
• Sediment budget deficit caused the erosion—not sea-level rise alone.
• Reefs nearby were not healthy enough to help replenish sand naturally.
⸻
🏗️ 3. Dredging in River Mouths and Bays
Dredging for flood control or navigation—especially under DAO 2019-13—can harm coastlines if poorly planned:
• Removes sediment that would normally nourish beaches.
• Deepens estuaries, altering sediment pathways and water flow.
• In some cases, sediment is exported for reclamation or sold, creating a net loss to the natural system.
📌 Example: In parts of Zambales, Botolan, and San Felipe, communities report worsening beach erosion after dredging of river mouths (e.g., Sto. Tomas River), even when done under IAC -DENR-sanctioned permits.
⸻
⚠️ 4. Long-Term Impacts on Communities and Ecosystems
• Loss of beachfront property and tourism areas.
• Weakened fish habitats due to disrupted sandy seabeds and nearshore ecosystems.
• Increased storm damage as natural buffers are stripped away.
• Permanent geomorphological changes that are hard to reverse.
As Siringan and others observed:
“Even if mining stops today, it can take decades—if at all—for the beaches to recover.”
⸻
✅ 5. Siringan’s Recommendations to Prevent Erosion from Sand Mining
🔹 Ban sand extraction directly from beaches and their nearshore zones.
🔹 Prohibit offshore dredging near sediment-starved coasts.
🔹 Use sediment budget studies and shoreline change maps before any extraction is approved.
🔹 Restore reefs and mangroves to help retain sediments and reduce wave energy.
🔹 Engage local communities in monitoring and beach profiling to detect early signs of erosion.
⸻
📚 Sources and References
• Siringan, F.P. et al. (2003). Economic Vulnerability and Adaptation to Coastal Erosion in San Fernando, La Union. MSI, UP Diliman.
• Siringan, F.P. (2024). Sea Level Rise and Coastal Erosion in the Philippines, Springer.
• PCAARRD-MSI Project Reports (2018–2022): Guidebook on Coastal Erosion Management.
• Various policy briefs and studies cited in:
• https://researchgate.net
• https://pcaarrd.dost.gov.ph
• https://journals.upd.edu.ph

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